This is a table of type trigram and their frequencies. Use it to search & browse the list to learn more about your study carrel.
trigram | frequency |
---|---|
a genus of | 199 |
of the shell | 193 |
part of the | 125 |
of microscopic foraminifera | 110 |
genus of microscopic | 109 |
in each valve | 99 |
genus composed of | 89 |
a genus composed | 89 |
of the genus | 87 |
the outer lip | 79 |
of the animal | 78 |
found in the | 75 |
of the aperture | 71 |
of the order | 69 |
said to be | 67 |
are found in | 64 |
the shells of | 61 |
the shell is | 59 |
family of the | 56 |
the body whorl | 56 |
side of the | 48 |
at the base | 48 |
is said to | 48 |
on account of | 47 |
more or less | 47 |
a series of | 47 |
of this genus | 47 |
this genus is | 45 |
the last whorl | 44 |
of species of | 43 |
of the body | 43 |
of which are | 42 |
are described as | 42 |
contains the genera | 41 |
muscular impressions two | 40 |
belonging to the | 40 |
of the same | 40 |
so as to | 39 |
some of the | 39 |
composed of species | 38 |
one of the | 37 |
the inner lip | 37 |
edge of the | 37 |
the shells are | 36 |
in which the | 36 |
in one valve | 36 |
published at l | 35 |
surface of the | 34 |
water to fathoms | 33 |
on the columella | 33 |
in the centre | 33 |
two in each | 33 |
base of the | 32 |
on each side | 32 |
at l s | 32 |
fossil species are | 32 |
of the whorls | 31 |
low water to | 31 |
the base of | 30 |
is found in | 30 |
the name of | 30 |
as in the | 30 |
of the spire | 30 |
in the other | 30 |
this family contains | 29 |
and in the | 29 |
the centre of | 29 |
there is a | 29 |
shells of this | 29 |
account of the | 29 |
family contains the | 29 |
containing the genera | 28 |
which it is | 28 |
the family of | 28 |
on the hinge | 28 |
the following genera | 28 |
the animal is | 28 |
the hinge of | 28 |
species are found | 27 |
this genus are | 27 |
a species of | 27 |
by means of | 27 |
in a fossil | 27 |
a bivalve shell | 27 |
a fossil state | 27 |
of the hinge | 26 |
will be found | 26 |
which may be | 26 |
of the valves | 26 |
of which is | 26 |
a term applied | 25 |
the species are | 25 |
distinguished by the | 25 |
covered with a | 25 |
of the outer | 25 |
shells of the | 25 |
those species of | 25 |
which have the | 25 |
it will be | 25 |
is divided into | 25 |
outer lip thickened | 25 |
divided into the | 25 |
by de blainville | 25 |
parts of the | 25 |
under the name | 25 |
in this family | 24 |
the aperture is | 24 |
of a shell | 24 |
of the shells | 24 |
may be known | 24 |
in the system | 24 |
the surface of | 24 |
the edge of | 23 |
and similar species | 23 |
in the plates | 23 |
margin of the | 23 |
a family of | 23 |
some species of | 23 |
this family are | 22 |
in the hinge | 22 |
a kind of | 22 |
in the genus | 22 |
in the first | 22 |
of the umbones | 22 |
folds on the | 21 |
term applied to | 21 |
which they are | 21 |
the system of | 21 |
a family belonging | 21 |
terminating in a | 21 |
as well as | 21 |
the aperture of | 21 |
two or three | 21 |
family belonging to | 21 |
sides of the | 21 |
outer lip thin | 21 |
impressions two in | 21 |
a number of | 21 |
are said to | 21 |
the first section | 21 |
in some species | 21 |
the back of | 21 |
it may be | 21 |
centre of the | 21 |
described as having | 20 |
of the most | 20 |
species of this | 20 |
is distinguished from | 20 |
and west indies | 20 |
the appearance of | 20 |
of those species | 20 |
this genus of | 20 |
the number of | 20 |
the form of | 20 |
that it is | 20 |
the margin of | 19 |
back of the | 19 |
the fossil species | 19 |
of the class | 19 |
the recent species | 19 |
section of the | 19 |
edges of the | 19 |
composing this genus | 19 |
of the species | 19 |
order of the | 19 |
a genus formed | 19 |
to be found | 19 |
of a bivalve | 19 |
shells composing this | 19 |
applied to the | 19 |
east and west | 19 |
the lower valve | 19 |
the order conchifera | 19 |
to each other | 19 |
at the anterior | 19 |
in the latter | 18 |
the greater part | 18 |
is described as | 18 |
on one side | 18 |
remarkable for the | 18 |
portion of the | 18 |
one or two | 18 |
which are described | 18 |
each side of | 18 |
with a large | 18 |
greater part of | 18 |
teeth in each | 18 |
order conchifera dimyaria | 18 |
the valves of | 18 |
this is the | 18 |
by the last | 18 |
included in the | 17 |
in order to | 17 |
when it is | 17 |
according to the | 17 |
species of the | 17 |
in the british | 17 |
from the umbones | 17 |
of the columella | 17 |
it is said | 17 |
recent species are | 17 |
that of the | 17 |
consisting of few | 17 |
as to form | 17 |
near the centre | 17 |
in general form | 17 |
first section of | 17 |
be found in | 17 |
the valves are | 17 |
the second family | 17 |
distinguished from the | 17 |
there are several | 17 |
the study of | 17 |
the genus helix | 17 |
in the family | 17 |
the apex of | 17 |
by the author | 16 |
each other in | 16 |
belong to the | 16 |
the point of | 16 |
attached by a | 16 |
extremity of the | 16 |
to form a | 16 |
in having the | 16 |
is called the | 16 |
attached to the | 16 |
from which it | 16 |
division of the | 16 |
at the apex | 16 |
the body of | 16 |
known by the | 16 |
second family of | 16 |
body of the | 16 |
a portion of | 16 |
the muscular impression | 16 |
of this family | 16 |
the head of | 16 |
shells belonging to | 16 |
hinge with two | 15 |
shells of which | 15 |
from low water | 15 |
from each other | 15 |
is composed of | 15 |
number of species | 15 |
of four valves | 15 |
those of the | 15 |
and other similar | 15 |
they are all | 15 |
in the tertiary | 15 |
these shells are | 15 |
of the family | 15 |
on the inner | 15 |
the order trachelipoda | 15 |
from the apex | 15 |
attached by the | 15 |
of numerous whorls | 15 |
of the sea | 15 |
sinus in the | 15 |
the first family | 15 |
other similar species | 15 |
in which they | 15 |
to be seen | 15 |
from the indian | 15 |
are divided into | 15 |
of the mantle | 15 |
it is a | 15 |
view of the | 15 |
means of a | 15 |
in the shell | 15 |
with the outer | 15 |
species occur in | 15 |
the purpose of | 15 |
composed of two | 15 |
of the first | 14 |
those which are | 14 |
all the species | 14 |
are to be | 14 |
containing the cartilage | 14 |
of the inner | 14 |
the upper part | 14 |
is to be | 14 |
to have been | 14 |
a pair of | 14 |
the first order | 14 |
the dorsal margin | 14 |
the ligament is | 14 |
genus of helix | 14 |
tooth in each | 14 |
contained in this | 14 |
genus of the | 14 |
composed of a | 14 |
side by side | 14 |
of the last | 14 |
the shells composing | 14 |
this genus from | 14 |
you will find | 14 |
the anterior extremity | 14 |
the sides of | 14 |
the soft parts | 14 |
the generic name | 14 |
the inner surface | 14 |
of which the | 14 |
the lower part | 14 |
fossil species occur | 13 |
of few whorls | 13 |
from which the | 13 |
such as the | 13 |
many of the | 13 |
cardinal teeth in | 13 |
of one valve | 13 |
to the family | 13 |
the characters of | 13 |
teeth on the | 13 |
consisting of numerous | 13 |
the edges of | 13 |
lip spread over | 13 |
to the first | 13 |
at the sides | 13 |
by some authors | 13 |
is known from | 13 |
terminating anteriorly in | 13 |
the indian ocean | 13 |
hinge with a | 13 |
which have a | 13 |
genus of shells | 13 |
to which the | 13 |
there is no | 13 |
the cardinal teeth | 13 |
the passage of | 13 |
the british museum | 13 |
the spire is | 13 |
it is the | 13 |
its name from | 13 |
the posterior side | 13 |
most of the | 13 |
containing the following | 13 |
known in a | 13 |
is the only | 13 |
genus of small | 13 |
be known from | 13 |
consisting of a | 13 |
inner lip spread | 13 |
divided into two | 12 |
it is found | 12 |
an example of | 12 |
the ventral margin | 12 |
a part of | 12 |
as having the | 12 |
the palleal impression | 12 |
into the families | 12 |
genus is known | 12 |
for the purpose | 12 |
the whorls of | 12 |
the whorls are | 12 |
of each valve | 12 |
the other valve | 12 |
several fossil species | 12 |
at both extremities | 12 |
of the other | 12 |
separated from the | 12 |
commonly called the | 12 |
the species of | 12 |
belongs to the | 12 |
is a very | 12 |
in which it | 12 |
anteriorly in a | 12 |
the power of | 12 |
the genera are | 12 |
of the latter | 12 |
first family of | 12 |
a piece of | 12 |
at the top | 12 |
part of a | 12 |
shell is said | 12 |
found on the | 12 |
a genus described | 12 |
may be thus | 12 |
consisting of species | 12 |
on which the | 12 |
genera of shells | 12 |
in london clay | 12 |
on the posterior | 12 |
in the same | 12 |
to which it | 11 |
two cardinal teeth | 11 |
the second section | 11 |
two muscular impressions | 11 |
structure of the | 11 |
head of the | 11 |
apex of the | 11 |
placed in a | 11 |
to the genus | 11 |
the reception of | 11 |
in the next | 11 |
a generic name | 11 |
the posterior extremity | 11 |
that part of | 11 |
shaped like a | 11 |
produced into a | 11 |
the external surface | 11 |
species of which | 11 |
belonging to this | 11 |
for the reception | 11 |
hinge of the | 11 |
notch in the | 11 |
they are found | 11 |
seen in the | 11 |
the two valves | 11 |
only known in | 11 |
a great number | 11 |
separated by a | 11 |
length of the | 11 |
close to the | 11 |
with a short | 11 |
upper part of | 11 |
a large sinus | 11 |
the shell of | 11 |
of a spiral | 11 |
spread over a | 11 |
corresponding with the | 11 |
great number of | 11 |
in the lower | 11 |
composed of the | 11 |
the third family | 11 |
composed of those | 11 |
towards the anterior | 11 |
the columellar lip | 11 |
it has been | 11 |
derives its name | 11 |
the foot of | 11 |
used to express | 11 |
appearance of a | 11 |
as it were | 11 |
of all the | 11 |
the same as | 11 |
the greater number | 10 |
genus differs from | 10 |
a shell is | 10 |
to the apex | 10 |
is a pretty | 10 |
of a series | 10 |
and in some | 10 |
be thus distinguished | 10 |
genus is distinguished | 10 |
of a byssus | 10 |
in the last | 10 |
the conchological illustrations | 10 |
described as differing | 10 |
in the second | 10 |
a short canal | 10 |
in some instances | 10 |
to the shell | 10 |
lower part of | 10 |
is one of | 10 |
it is called | 10 |
lines of growth | 10 |
cardinal tooth in | 10 |
the latter is | 10 |
the inner edge | 10 |
genus consisting of | 10 |
are composed of | 10 |
in the palleal | 10 |
the anterior of | 10 |
at both ends | 10 |
three or four | 10 |
modified by the | 10 |
in the aperture | 10 |
a genus consisting | 10 |
on the other | 10 |
anterior of the | 10 |
have been found | 10 |
be known by | 10 |
this genus differs | 10 |
the genus is | 10 |
consisting of those | 10 |
the last of | 10 |
name given to | 10 |
term is applied | 10 |
a very large | 10 |
over the back | 10 |
and outer lips | 10 |
in the outer | 10 |
lateral teeth in | 10 |
oval or oblong | 10 |
they are said | 10 |
they have been | 10 |
first order of | 10 |
of de blainville | 10 |
the genera of | 10 |
pit in the | 10 |
end of the | 10 |
second section of | 10 |
the animal has | 10 |
as it is | 10 |
at the extremities | 10 |
form of a | 10 |
be seen in | 10 |
formed for the | 10 |
which it differs | 10 |
as they are | 10 |
the isle of | 10 |
in the mediterranean | 10 |
covered with an | 10 |
tooth on the | 10 |
with a small | 10 |
few fossil species | 10 |
from the true | 10 |
the shells belonging | 10 |
to the present | 10 |
third family of | 10 |
of land shells | 10 |
notch at the | 10 |
the case with | 10 |
divided into three | 9 |
the exception of | 9 |
that there is | 9 |
direction of the | 9 |
at the posterior | 9 |
for the passage | 9 |
will be necessary | 9 |
they are not | 9 |
with the exception | 9 |
with the genus | 9 |
the whole length | 9 |
it differs in | 9 |
of a single | 9 |
when the valves | 9 |
the direction of | 9 |
they may be | 9 |
the inner and | 9 |
a division of | 9 |
in the sand | 9 |
resemblance to the | 9 |
they are divided | 9 |
in the middle | 9 |
it would be | 9 |
palleal impression with | 9 |
the shell itself | 9 |
the seas of | 9 |
but in the | 9 |
it contains the | 9 |
of the two | 9 |
in the sea | 9 |
on the surface | 9 |
when the animal | 9 |
that they are | 9 |
genus formed for | 9 |
a very short | 9 |
one in each | 9 |
and by the | 9 |
by which it | 9 |
this family is | 9 |
the shores of | 9 |
characters of the | 9 |
one of which | 9 |
or nearly so | 9 |
is of a | 9 |
l s d | 9 |
the shell in | 9 |
from to fathoms | 9 |
are those which | 9 |
de blainville in | 9 |
aperture of the | 9 |
are distinguished by | 9 |
over part of | 9 |
the animal of | 9 |
a genus proposed | 9 |
of them are | 9 |
with a triangular | 9 |
to be the | 9 |
fold on the | 9 |
the operculum is | 9 |
of the axis | 9 |
name of the | 9 |
on the back | 9 |
of the science | 9 |
as distinguished from | 9 |
are remarkable for | 9 |
is remarkable for | 9 |
near the umbones | 9 |
inner and outer | 9 |
last of which | 9 |
placed by de | 9 |
brought from the | 9 |
on the upper | 9 |
in some degree | 9 |
passage of a | 9 |
of some shells | 9 |
appears to be | 9 |
on the right | 9 |
by which the | 9 |
to be a | 9 |
the second order | 9 |
species are known | 9 |
to the axis | 9 |
at the lower | 9 |
is the case | 9 |
teeth in the | 9 |
impression with a | 9 |
with two cardinal | 9 |
contained in a | 9 |
that on the | 8 |
with any other | 8 |
of the larger | 8 |
one side of | 8 |
allied to the | 8 |
spread over the | 8 |
and the shell | 8 |
impression of the | 8 |
of the lower | 8 |
this is a | 8 |
but having a | 8 |
of the animals | 8 |
described as resembling | 8 |
various parts of | 8 |
that you have | 8 |
consisting of the | 8 |
those who have | 8 |
a term used | 8 |
formed by the | 8 |
are brought from | 8 |
with regard to | 8 |
several species of | 8 |
of the conchological | 8 |
size of the | 8 |
contains the following | 8 |
some of them | 8 |
and other species | 8 |
feet in length | 8 |
second order of | 8 |
of the pillar | 8 |
covered by the | 8 |
genus are found | 8 |
hinge with three | 8 |
in the case | 8 |
contiguous to the | 8 |
of these are | 8 |
also in the | 8 |
been found in | 8 |
owing to the | 8 |
and from the | 8 |
into the following | 8 |
variable in form | 8 |
species which have | 8 |
genus separated from | 8 |
only one species | 8 |
furnished with a | 8 |
muscular impressions one | 8 |
in a straight | 8 |
genus formed of | 8 |
is distinguished by | 8 |
the third order | 8 |
is a genus | 8 |
is difficult to | 8 |
this term is | 8 |
one hundred and | 8 |
it is necessary | 8 |
of which it | 8 |
as differing from | 8 |
to express the | 8 |
species found in | 8 |
is a common | 8 |
the substance of | 8 |
to the rocks | 8 |
the side of | 8 |
suture of the | 8 |
described as a | 8 |
from which they | 8 |
of the genera | 8 |
the nature of | 8 |
of some authors | 8 |
name from the | 8 |
has been divided | 8 |
temperate and tropical | 8 |
destitute of teeth | 8 |
distance from the | 8 |
over a portion | 8 |
found in a | 8 |
the spire of | 8 |
when there is | 8 |
extra cloth bds | 8 |
gaping at both | 8 |
rest of the | 8 |
valves of a | 8 |
in the form | 8 |
pointed at the | 8 |
which have been | 8 |
system of lamarck | 8 |
may be distinguished | 8 |
the end of | 8 |
genus has been | 8 |
is common in | 8 |
the first is | 8 |
the type of | 8 |
which is not | 8 |
principally in the | 8 |
foot of the | 8 |
placed on the | 8 |
it is difficult | 8 |
be observed that | 8 |
as an example | 8 |
at one end | 8 |
the left valve | 8 |
of the muscular | 8 |
are known from | 8 |
outer lip with | 8 |
position of the | 8 |
belongs to this | 8 |
of the valve | 8 |
the top of | 8 |
the whole of | 8 |
in the opposite | 8 |
the latter genus | 8 |
at the extremity | 8 |
it is not | 8 |
passing through a | 8 |
to this genus | 8 |
the rest of | 8 |
in all climates | 8 |
composed of several | 8 |
some bivalve shells | 8 |
which are found | 8 |
with an epidermis | 8 |
is that part | 8 |
differ from the | 8 |
at each extremity | 8 |
our own coasts | 8 |
greater number of | 8 |
a spiral shell | 8 |
shells which are | 8 |
each other by | 8 |
two lateral teeth | 8 |
it is sometimes | 8 |
those species which | 8 |
composed of numerous | 8 |
of this age | 8 |
interior of the | 8 |
to this family | 8 |
of shelly matter | 8 |
outer lip slightly | 8 |
as far as | 8 |
the remains of | 8 |
be necessary to | 8 |
radiating from the | 8 |
is the most | 8 |
are attached to | 8 |
genus described as | 8 |
of the british | 8 |
is on the | 8 |
of the work | 7 |
differs in the | 7 |
used as a | 7 |
they will be | 7 |
in fresh water | 7 |
a genus separated | 7 |
are mostly tropical | 7 |
fold in the | 7 |
one of them | 7 |
out of the | 7 |
the bottom of | 7 |
in a very | 7 |
covered by a | 7 |
the order lamellibranchiata | 7 |
the term is | 7 |
impressions in each | 7 |
hinge with one | 7 |
carbonate of lime | 7 |
found on our | 7 |
account of their | 7 |
of paracephalophora monoica | 7 |
represented in the | 7 |
this genus has | 7 |
valve of the | 7 |
of the more | 7 |
in some cases | 7 |
three cardinal teeth | 7 |
with the apex | 7 |
not only in | 7 |
the growth of | 7 |
to the other | 7 |
of those who | 7 |
inner lip thickened | 7 |
only in the | 7 |
no lateral teeth | 7 |
on which they | 7 |
in this genus | 7 |
of british shells | 7 |
aperture of a | 7 |
the outer surface | 7 |
being attached by | 7 |
from the east | 7 |
the posterior margin | 7 |
has been separated | 7 |
is named the | 7 |
the columella is | 7 |
apex or nucleus | 7 |
then said to | 7 |
at the back | 7 |
the want of | 7 |
regard to the | 7 |
one on each | 7 |
in others it | 7 |
form of the | 7 |
open at both | 7 |
there is but | 7 |
instead of being | 7 |
appearance of the | 7 |
truncated at the | 7 |
the anterior margin | 7 |
the london clay | 7 |
the east and | 7 |
to which they | 7 |
beds of this | 7 |
is necessary to | 7 |
is found on | 7 |
shells in the | 7 |
occur in the | 7 |
one species of | 7 |
the order gasteropoda | 7 |
hinge without teeth | 7 |
whole of the | 7 |
whole length of | 7 |
in both valves | 7 |
brought to this | 7 |
it is described | 7 |
is but one | 7 |
the mouth of | 7 |
distinguish this genus | 7 |
contained in the | 7 |
the following families | 7 |
are several fossil | 7 |
with a series | 7 |
which in the | 7 |
impressions one in | 7 |
supported on a | 7 |
place in the | 7 |
of this order | 7 |
the size of | 7 |
in having a | 7 |
one or more | 7 |
is that which | 7 |
top of the | 7 |
the animals of | 7 |
been divided into | 7 |
burrowing in sand | 7 |
which is found | 7 |
be distinguished from | 7 |
the right valve | 7 |
the same species | 7 |
in such a | 7 |
the case of | 7 |
species are very | 7 |
an external ligament | 7 |
of the tube | 7 |
valves of which | 7 |
consist of a | 7 |
the east indies | 7 |
the hinge is | 7 |
on our own | 7 |
differs in having | 7 |
fourth family of | 7 |
near the apex | 7 |
character of the | 7 |
in other respects | 7 |
manner in which | 7 |
in a circle | 7 |
for the cabinet | 7 |
section of paracephalophora | 7 |
published by the | 7 |
by the letter | 7 |
which will be | 7 |
having the spire | 7 |
and the aperture | 7 |
a resemblance to | 7 |
by an operculum | 7 |
the absence of | 7 |
the common oyster | 7 |
is in the | 7 |
by de montfort | 7 |
a common name | 7 |
included in this | 7 |
great russell street | 7 |
of the second | 7 |
to the order | 7 |
which the animal | 7 |
teeth in one | 7 |
with a very | 7 |
which are not | 7 |
the first genus | 7 |
with the aperture | 7 |
species of ammonites | 7 |
are not numerous | 7 |
a new genus | 7 |
as to the | 7 |
inner surface of | 7 |
described by de | 7 |
properly so called | 7 |
third order of | 7 |
near the margin | 7 |
such a manner | 7 |
on the anterior | 7 |
at the dorsal | 7 |
that part which | 7 |
upon each other | 7 |
the roots of | 7 |
the fourth family | 7 |
of several species | 7 |
a sort of | 7 |
nature of the | 7 |
the tertiary beds | 7 |
the colour is | 7 |
the interior of | 7 |
and it is | 7 |
be described as | 7 |
of small shells | 7 |
to this country | 7 |
than the other | 7 |
may be seen | 7 |
very variable in | 7 |
to the aperture | 7 |
we find the | 7 |
account of its | 7 |
is a large | 7 |
the thickness of | 7 |
those which have | 7 |
it comes from | 7 |
placed near the | 7 |
a genus founded | 7 |
arranged in a | 7 |
consisting of four | 7 |
by a small | 7 |
at a distance | 7 |
may be added | 7 |
with the plates | 7 |
on the sea | 7 |
system of de | 7 |
which are attached | 7 |
teeth on each | 6 |
nearest to the | 6 |
in some of | 6 |
distinguished as follows | 6 |
in the animal | 6 |
is contained in | 6 |
rapidly increasing whorls | 6 |
appear to be | 6 |
into each other | 6 |
in a groove | 6 |
a horny operculum | 6 |
at the umbones | 6 |
proposed to include | 6 |
is the same | 6 |
to shells of | 6 |
found in london | 6 |
in a short | 6 |
beautifully coloured plates | 6 |
tooth in one | 6 |
union with the | 6 |
to the surface | 6 |
side in a | 6 |
growth of the | 6 |
is only known | 6 |
as soon as | 6 |
to which may | 6 |
the parietal valves | 6 |
two rows of | 6 |
with the hammer | 6 |
species of chiton | 6 |
a distance from | 6 |
under the generic | 6 |
in the former | 6 |
this well known | 6 |
species which are | 6 |
there are many | 6 |
the larger valve | 6 |
in a great | 6 |
which have no | 6 |
the body is | 6 |
placed in the | 6 |
there is one | 6 |
in a point | 6 |
well known to | 6 |
given in the | 6 |
outer lip of | 6 |
genus proposed to | 6 |
small species are | 6 |
by a byssus | 6 |
shell from the | 6 |
the genus trochus | 6 |
the difference between | 6 |
on the outer | 6 |
a young state | 6 |
a single piece | 6 |
the action of | 6 |
plaits on the | 6 |
the figures of | 6 |
species of helix | 6 |
example of this | 6 |
of the beds | 6 |
state of the | 6 |
the genus unio | 6 |
natural history of | 6 |
spire very short | 6 |
genera contained in | 6 |
more properly to | 6 |
the place where | 6 |
closed at the | 6 |
a prominent fulcrum | 6 |
in the skin | 6 |
there are three | 6 |
the anterior side | 6 |
bottom of the | 6 |
at each end | 6 |
the animal to | 6 |
on each valve | 6 |
new south wales | 6 |
isle of wight | 6 |
the anterior termination | 6 |
in general appearance | 6 |
from the body | 6 |
on the opposite | 6 |
introduction to the | 6 |
anterior and posterior | 6 |
the successive layers | 6 |
the habits of | 6 |
coast of africa | 6 |
history of the | 6 |
of bivalve shells | 6 |
great variety of | 6 |
the anterior canal | 6 |
of two or | 6 |
against each other | 6 |
the structure of | 6 |
on the pillar | 6 |
species of ampullaria | 6 |
in a young | 6 |
on rocks and | 6 |
genera may be | 6 |
and descriptions of | 6 |
have an operculum | 6 |
is applied to | 6 |
of a more | 6 |
should be placed | 6 |
of figures to | 6 |
tooth in the | 6 |
which in some | 6 |
land and fresh | 6 |
of shells is | 6 |
in the shells | 6 |
as long as | 6 |
by side in | 6 |
which has the | 6 |
of the sub | 6 |
this country by | 6 |
is a fine | 6 |
in the southern | 6 |
species is known | 6 |
in other cases | 6 |
the spire and | 6 |
for the most | 6 |
of a species | 6 |
anterior part of | 6 |
it is always | 6 |
long as the | 6 |
termination of the | 6 |
country by mr | 6 |
the anterior part | 6 |
it is known | 6 |
muscular impression of | 6 |
the above description | 6 |
of one or | 6 |
front of the | 6 |
in the number | 6 |
only in a | 6 |
on both sides | 6 |
type of this | 6 |
while that of | 6 |
of the spiral | 6 |
and tropical climates | 6 |
of species is | 6 |
one species is | 6 |
united by a | 6 |
in the greater | 6 |
they do not | 6 |
of the next | 6 |
in the upper | 6 |
the apex or | 6 |
one in the | 6 |
the next family | 6 |
the bones of | 6 |
one on the | 6 |
the posterior part | 6 |
of the water | 6 |
with the spire | 6 |
the plants of | 6 |
want of a | 6 |
of the lamarckian | 6 |
on the shores | 6 |
being composed of | 6 |
to the study | 6 |
of this class | 6 |
byssus passing through | 6 |
the genus dentalium | 6 |
genus of land | 6 |
many species of | 6 |
posterior part of | 6 |
are covered with | 6 |
it is very | 6 |
towards the spire | 6 |
which is a | 6 |
genera and species | 6 |
may be observed | 6 |
some of which | 6 |
of fossil shells | 6 |
outer lip simple | 6 |
posterior muscular impression | 6 |
only a few | 6 |
two of which | 6 |
latter of which | 6 |
of these shells | 6 |
the most part | 6 |
placed at the | 6 |
to that of | 6 |
following genera of | 6 |
mouth of the | 6 |
are found on | 6 |
are very numerous | 6 |
it is nearly | 6 |
the shape of | 6 |
common in collections | 6 |
the muscular impressions | 6 |
of a large | 6 |
from the genus | 6 |
in the south | 6 |
and have a | 6 |
as to be | 6 |
occurring in the | 6 |
of the operculum | 6 |
applied to a | 6 |
of the following | 6 |
is a beautiful | 6 |
they belong to | 6 |
substance of the | 6 |
longer than the | 6 |
of an univalve | 6 |
will be seen | 6 |
there are two | 6 |
are several species | 6 |
the manner in | 6 |
histoire naturelle des | 6 |
a fossil genus | 6 |
with a long | 6 |
where it is | 6 |
but differs in | 6 |
shell is composed | 6 |
the red sea | 6 |
containing the genus | 6 |
forbes and hanley | 6 |
series of small | 6 |
in the ventral | 6 |
of the plants | 6 |
in this country | 6 |
all the shells | 6 |
outer lip is | 6 |
figures and descriptions | 6 |
are distinguished from | 6 |
supported upon a | 6 |
is marked with | 6 |
which this genus | 6 |
habits of the | 6 |
passing through the | 6 |
l s this | 6 |
point of the | 6 |
study of the | 6 |
of the world | 6 |
and having a | 6 |
the position of | 6 |
one muscular impression | 6 |
has the power | 6 |
are attached by | 6 |
a straight line | 6 |
the dorsal edge | 6 |
name is derived | 6 |
hiatus in the | 6 |
at the edge | 6 |
comes from the | 6 |
soft parts of | 6 |
that which is | 6 |
a more or | 6 |
to describe the | 6 |
and two lateral | 6 |
coat of mail | 6 |
with the umbo | 6 |
in various parts | 6 |
of great britain | 6 |
the animals are | 6 |
in the left | 6 |
over the body | 6 |
the former is | 6 |
is attached to | 5 |
recent species of | 5 |
of the upper | 5 |
by a flat | 5 |
the author has | 5 |
known from all | 5 |
a native of | 5 |
it is impossible | 5 |
ponds and ditches | 5 |
is impossible to | 5 |
i do not | 5 |
under the microscope | 5 |
by the thickness | 5 |
from the lias | 5 |
so that the | 5 |
last whorl large | 5 |
shells contained in | 5 |
the hinge lamina | 5 |
to those species | 5 |
with a hollow | 5 |
some species are | 5 |
would be more | 5 |
the latter being | 5 |
with the ligament | 5 |
the class mollusca | 5 |
through a hole | 5 |
the shell by | 5 |
with the whorls | 5 |
the whole shell | 5 |
lip with a | 5 |
others it is | 5 |
of the foot | 5 |
although it is | 5 |
the notch in | 5 |
the genus chiton | 5 |
near the posterior | 5 |
hinge of one | 5 |
and to the | 5 |
it is then | 5 |
into chambers by | 5 |
an operculum of | 5 |
london clay and | 5 |
the plates beautifully | 5 |
from the nucleus | 5 |
the name given | 5 |
use of the | 5 |
divided into chambers | 5 |
applied to shells | 5 |
of some bivalve | 5 |
is an example | 5 |
known to be | 5 |
perforated by a | 5 |
the next genus | 5 |
and inhabits stone | 5 |
the most beautiful | 5 |
the principal part | 5 |
with numerous whorls | 5 |
to be observed | 5 |
a short spire | 5 |
which is the | 5 |
this order is | 5 |
of this is | 5 |
and the inner | 5 |
to the species | 5 |
close the aperture | 5 |
answers to the | 5 |
a univalve shell | 5 |
which the whorls | 5 |
to explain the | 5 |
by which they | 5 |
is very large | 5 |
only two or | 5 |
inner lip smooth | 5 |
on the dorsal | 5 |
genus of fossil | 5 |
no genera of | 5 |
figures of the | 5 |
the only genus | 5 |
genera have been | 5 |
remote lateral teeth | 5 |
the opercular valves | 5 |
the whorls being | 5 |
the latter of | 5 |
open at the | 5 |
described as being | 5 |
of the whorl | 5 |
four valves in | 5 |
species are not | 5 |
of tropical climates | 5 |
instance of this | 5 |
of the umbo | 5 |
than the rest | 5 |
the philippine islands | 5 |
which there are | 5 |
to tropical climates | 5 |
is easily known | 5 |
destitute of the | 5 |
resemblance to a | 5 |
the front of | 5 |
the ventral margins | 5 |
the genera may | 5 |
common name given | 5 |
this order are | 5 |
the bivalve shells | 5 |
the extremity of | 5 |
of natural history | 5 |
includes the genera | 5 |
well known genus | 5 |
is formed by | 5 |
is used to | 5 |
is also a | 5 |
where the head | 5 |
the adductor muscles | 5 |
also found in | 5 |
outer surface of | 5 |
are provided with | 5 |
nearly allied to | 5 |
a great variety | 5 |
canal at the | 5 |
which have an | 5 |
with a prominent | 5 |
a large genus | 5 |
both sides of | 5 |
at the bottom | 5 |
full natural size | 5 |
name given by | 5 |
this order contains | 5 |
you may find | 5 |
the shell and | 5 |
species are numerous | 5 |
it must be | 5 |
have not the | 5 |
those in the | 5 |
from the outer | 5 |
a minute fossil | 5 |
at one extremity | 5 |
rows of varices | 5 |
fossil species of | 5 |
an univalve shell | 5 |
lateral tooth in | 5 |
rounded at the | 5 |
with a number | 5 |
characterized by a | 5 |
it consists of | 5 |
point at the | 5 |
forms part of | 5 |
outer lip reflected | 5 |
to any shell | 5 |
general form of | 5 |
bivalve shell is | 5 |
applied to any | 5 |
by the whole | 5 |
a collection of | 5 |
to the outer | 5 |
with an internal | 5 |
of polythalamous cephalopoda | 5 |
on this account | 5 |
a triangular disc | 5 |
it is to | 5 |
of which there | 5 |
on the same | 5 |
in great britain | 5 |
in the right | 5 |
named from the | 5 |
posteriorly in a | 5 |
which are placed | 5 |
the upper valve | 5 |
apex to the | 5 |
a fossil species | 5 |
tooth of the | 5 |
from all other | 5 |
found in rivers | 5 |
having an operculum | 5 |
many of them | 5 |
the volutions of | 5 |
may also be | 5 |
of the pacific | 5 |
easily distinguished from | 5 |
so named from | 5 |
found near the | 5 |
are destitute of | 5 |
principal part of | 5 |
a sinus in | 5 |
is easily distinguished | 5 |
the lines of | 5 |
gaping at the | 5 |
which has a | 5 |
case with the | 5 |
and form a | 5 |
this may be | 5 |
is furnished with | 5 |
outside of the | 5 |
number of genera | 5 |
explanation of figures | 5 |
by the waves | 5 |
the first instance | 5 |
are common in | 5 |
to the canal | 5 |
the shells in | 5 |
genera enumerated in | 5 |
their shells are | 5 |
them from the | 5 |
lip slightly thickened | 5 |
is also applied | 5 |
of new holland | 5 |
placed among the | 5 |
to the brachiopoda | 5 |
of a univalve | 5 |
to the spire | 5 |
ligamentary pit in | 5 |
hinder part of | 5 |
family of polythalamous | 5 |
shells are found | 5 |
of some of | 5 |
consists in the | 5 |
destitute of shells | 5 |
nearest approach to | 5 |
a pretty shell | 5 |
is also used | 5 |
no danger of | 5 |
they differ from | 5 |
and the posterior | 5 |
sometimes called the | 5 |
the contents of | 5 |
a byssus passing | 5 |
a regular spire | 5 |
with a thick | 5 |
are represented in | 5 |
common name for | 5 |
buried in the | 5 |
the internal ligament | 5 |
with a single | 5 |
in many instances | 5 |
occurs in the | 5 |
in the chalk | 5 |
umbones separated by | 5 |
is that the | 5 |
by one or | 5 |
external surface of | 5 |
hidden by the | 5 |
a notch or | 5 |
is a small | 5 |
in every respect | 5 |
in his genus | 5 |
of which only | 5 |
the apex to | 5 |
the general form | 5 |
exception of the | 5 |
part which is | 5 |
are furnished with | 5 |
species belong to | 5 |
cardinal and two | 5 |
have been separated | 5 |
of species with | 5 |
the indian seas | 5 |
of de montfort | 5 |
low water mark | 5 |
coasts of the | 5 |
of the isle | 5 |
belong to tropical | 5 |
shape of the | 5 |
in the zoological | 5 |
the most remarkable | 5 |
so that they | 5 |
operculum consisting of | 5 |
the common garden | 5 |
genus of pupa | 5 |
that in the | 5 |
which forms the | 5 |
corresponds with the | 5 |
the septa of | 5 |
anterior muscular impression | 5 |
in some respects | 5 |
indicated by the | 5 |
in the nautilus | 5 |
de blainville as | 5 |
the umbo of | 5 |
example of the | 5 |
by the muscular | 5 |
united by sowerby | 5 |
the well known | 5 |
of the hammer | 5 |
a variety of | 5 |
are beautifully coloured | 5 |
of the columellar | 5 |
muscular impressions are | 5 |
and the upper | 5 |
and some others | 5 |
have but one | 5 |
which you will | 5 |
are examples of | 5 |
be distinguished by | 5 |
fixed on the | 5 |
plates beautifully coloured | 5 |
is termed the | 5 |
that the animal | 5 |
genus of natica | 5 |
species of venus | 5 |
of spiral univalves | 5 |
to the base | 5 |
on the coast | 5 |
in parts to | 5 |
cast of a | 5 |
they are described | 5 |
to marine substances | 5 |
lip thickened within | 5 |
nearly all the | 5 |
will find it | 5 |
the outside of | 5 |
posterior side of | 5 |
that of a | 5 |
from its resemblance | 5 |
between the umbones | 5 |
from any other | 5 |
greatest distance from | 5 |
axis of the | 5 |
two british species | 5 |
muscular impressions in | 5 |
other genera of | 5 |
be confounded with | 5 |
margins of the | 5 |
is one which | 5 |
the greatest distance | 5 |
the length of | 5 |
and there is | 5 |
in this respect | 5 |
valves in pairs | 5 |
or three species | 5 |
the opposite side | 5 |
other in a | 5 |
the suture of | 5 |
but also in | 5 |
a rare and | 5 |
shell when it | 5 |
the time of | 5 |
or those which | 5 |
with or without | 5 |
in many cases | 5 |
in the genera | 5 |
and the anterior | 5 |
oblong or oval | 5 |
at the greatest | 5 |
is a rare | 5 |
from those of | 5 |
the neighbourhood of | 5 |
the generic characters | 5 |
and a very | 5 |
british species of | 5 |
reflected over the | 5 |
are natives of | 5 |
and of the | 5 |
in this order | 5 |
closed at one | 5 |
among the most | 5 |
a few fossil | 5 |
the nearest approach | 5 |
order is divided | 5 |
of them is | 5 |
three or more | 5 |
fossils of the | 5 |
a fossil shell | 5 |
down to the | 5 |
any other genus | 5 |
of the canal | 5 |
on the outside | 5 |
the under side | 5 |
our own shores | 5 |
of both valves | 5 |
from the centre | 5 |
genera into which | 5 |
larger than the | 5 |
in the direction | 5 |
order of paracephalophora | 5 |
to be obtained | 5 |
water to fath | 5 |
and of a | 5 |
to have a | 5 |
class of the | 5 |
near the aperture | 5 |
in not having | 4 |
canal at each | 4 |
of the parent | 4 |
for the first | 4 |
being larger than | 4 |
will give you | 4 |
have the spire | 4 |
or any other | 4 |
supposed to be | 4 |
a mass of | 4 |
from the spire | 4 |
of one of | 4 |
families of the | 4 |
the surfaces of | 4 |
of the various | 4 |
which separates the | 4 |
by a series | 4 |
series of teeth | 4 |
the list of | 4 |
of the septa | 4 |
not having the | 4 |
it is also | 4 |
to the genera | 4 |
is covered with | 4 |
genus from the | 4 |
part of these | 4 |
of the specimen | 4 |
a bivalve is | 4 |
remote from the | 4 |
in the explanation | 4 |
to distinguish this | 4 |
in which case | 4 |
typical species of | 4 |
simple in form | 4 |
are the most | 4 |
given to the | 4 |
form part of | 4 |
of multivalve shells | 4 |
closed by the | 4 |
to the nayades | 4 |
those in which | 4 |
species are british | 4 |
they are also | 4 |
towards the posterior | 4 |
by the name | 4 |
which forms a | 4 |
thinness of the | 4 |
seas of new | 4 |
will be observed | 4 |
umbones in each | 4 |
the mouth is | 4 |
by the inner | 4 |
at the end | 4 |
in this case | 4 |
with a kind | 4 |
genus of sessile | 4 |
the most elegant | 4 |
species have been | 4 |
having but one | 4 |
six parietal valves | 4 |
when full grown | 4 |
a tooth on | 4 |
and some of | 4 |
a triangular area | 4 |
and they are | 4 |
on the edge | 4 |
known only in | 4 |
at low water | 4 |
as to present | 4 |
in a long | 4 |
s this is | 4 |
to the inner | 4 |
of testaceous mollusca | 4 |
they are distinguished | 4 |
in most cases | 4 |
the other side | 4 |
have been formed | 4 |
the regularity of | 4 |
one lateral tooth | 4 |
name of a | 4 |
by the number | 4 |
the animal in | 4 |
a few species | 4 |
genus of melanopsis | 4 |
of its form | 4 |
larger and more | 4 |
the class acephalophora | 4 |
of the author | 4 |
to the margin | 4 |
an hiatus in | 4 |
the use of | 4 |
having the inner | 4 |
will be the | 4 |
from the seas | 4 |
like that of | 4 |
in some parts | 4 |
next in order | 4 |
dorsal margin of | 4 |
a slight emargination | 4 |
found buried in | 4 |
examples of this | 4 |
for this purpose | 4 |
family are described | 4 |
a microscopic shell | 4 |
has the appearance | 4 |
absence of the | 4 |
the shell has | 4 |
consisting of two | 4 |
the lateral teeth | 4 |
which the shells | 4 |
it is turned | 4 |
shell of a | 4 |
rudiments of conchology | 4 |
hole in the | 4 |
as in murex | 4 |
of the indian | 4 |
be observed in | 4 |
two cardinal and | 4 |
the anterior and | 4 |
the axis of | 4 |
equal to the | 4 |
tabular view of | 4 |
when the whorls | 4 |
collection may be | 4 |
muscular impressions distant | 4 |
the latter are | 4 |
opening at the | 4 |
from the south | 4 |
the young of | 4 |
it should be | 4 |
analogous to the | 4 |
relation to the | 4 |
the common snail | 4 |
varix at the | 4 |
remote lateral tooth | 4 |
on all coasts | 4 |
the species hitherto | 4 |
are separated by | 4 |
provided with a | 4 |
the ligamentary pit | 4 |
genus of bulinus | 4 |
the character of | 4 |
difference in the | 4 |
to receive the | 4 |
in the seas | 4 |
pair of forceps | 4 |
number of instances | 4 |
from side to | 4 |
common garden slug | 4 |
like the common | 4 |
and may be | 4 |
the pinna is | 4 |
palleal impression not | 4 |
in the isle | 4 |
seas of the | 4 |
in sand and | 4 |
the plants on | 4 |
you know the | 4 |
it is divided | 4 |
reflected over part | 4 |
and also in | 4 |
isle of france | 4 |
as having a | 4 |
the hinge line | 4 |
extremities of the | 4 |
which has been | 4 |
is no danger | 4 |
in all seas | 4 |
is a fossil | 4 |
from the mediterranean | 4 |
species of terebratula | 4 |
and is divided | 4 |
the columella has | 4 |
skin of the | 4 |
they are very | 4 |
as consisting of | 4 |
and the second | 4 |
to belong to | 4 |
are placed at | 4 |
of sessile cirripedes | 4 |
far as they | 4 |
in a canal | 4 |
and one remote | 4 |
on the contrary | 4 |
is then said | 4 |
in the neighbourhood | 4 |
the manner of | 4 |
at the head | 4 |
family of polythalamacea | 4 |
the species which | 4 |
are included in | 4 |
you are already | 4 |
the genera contained | 4 |
on the whole | 4 |
with a central | 4 |
in some shells | 4 |
body whorl and | 4 |
be found to | 4 |
are from the | 4 |
point of a | 4 |
work on the | 4 |
history of british | 4 |
here is a | 4 |
the umbones in | 4 |
species of bulla | 4 |
serves the purpose | 4 |
can only be | 4 |
with one or | 4 |
living in holes | 4 |
described in the | 4 |
found in fresh | 4 |
we find a | 4 |
which the genus | 4 |
it forms a | 4 |
closed by an | 4 |
of which a | 4 |
the peculiarity of | 4 |
and the outer | 4 |
of a round | 4 |
then to be | 4 |
species from the | 4 |
genera of the | 4 |
shell on which | 4 |
near the base | 4 |
shells which have | 4 |
obtained from the | 4 |
covered by an | 4 |
cirripedes of lamarck | 4 |
composed of one | 4 |
in the flat | 4 |
several of them | 4 |
made up of | 4 |
having an umbilicus | 4 |
which is only | 4 |
each of which | 4 |
enclose the aperture | 4 |
to of the | 4 |
it are described | 4 |
in distinction from | 4 |
having a series | 4 |
side to side | 4 |
which it has | 4 |
more numerous than | 4 |
is near the | 4 |
the internal cavity | 4 |
univalve shell is | 4 |
of two pieces | 4 |
a manner that | 4 |
small species of | 4 |
with the subject | 4 |
of their shells | 4 |
they are called | 4 |
belonging to it | 4 |
containing no genera | 4 |
to distinguish it | 4 |
cavity in the | 4 |
have been made | 4 |
to the foot | 4 |
the chambers of | 4 |
the attached valve | 4 |
the course of | 4 |
of the whole | 4 |
said to have | 4 |
were brought to | 4 |
a triangular pit | 4 |
the posterior muscular | 4 |
were placed by | 4 |
and also by | 4 |
by the absence | 4 |
touch each other | 4 |
seen when the | 4 |
another view of | 4 |
of the little | 4 |
one recent species | 4 |
by sir william | 4 |
edge of a | 4 |
may easily be | 4 |
of the figures | 4 |
the british species | 4 |
consists of a | 4 |
as in fig | 4 |
generic name proposed | 4 |
as belonging to | 4 |
in a slight | 4 |
the largest of | 4 |
it has the | 4 |
that may be | 4 |
you will have | 4 |
its resemblance to | 4 |
a common species | 4 |
to which are | 4 |
of the volutions | 4 |
the plants in | 4 |
composed of four | 4 |
through the shell | 4 |
this genus by | 4 |
common in the | 4 |
the above name | 4 |
which you may | 4 |
properly to the | 4 |
of marine shells | 4 |
outer lip crenated | 4 |
rare and beautiful | 4 |
the last family | 4 |
the first group | 4 |
taken from the | 4 |
is given in | 4 |
in the market | 4 |
the nucleus of | 4 |
the teeth of | 4 |
of the new | 4 |
of invertebrated animals | 4 |
of which has | 4 |
of the whale | 4 |
the septa are | 4 |
with the shells | 4 |
of the preceding | 4 |
over a part | 4 |
the first division | 4 |
this genus contains | 4 |
figured in the | 4 |
farthest from the | 4 |
some small species | 4 |
in the anterior | 4 |
the cast of | 4 |
we do not | 4 |
of lamarck and | 4 |
the most important | 4 |
and the other | 4 |
and a half | 4 |
and those of | 4 |
de blainville to | 4 |
and you will | 4 |
is very common | 4 |
by some writers | 4 |
anterior extremity of | 4 |
it has a | 4 |
of which they | 4 |
part where the | 4 |
of small teeth | 4 |
texture of the | 4 |
they are of | 4 |
a catalogue of | 4 |
by a siphon | 4 |
new species were | 4 |
of the globe | 4 |
as for instance | 4 |
the skin of | 4 |
is a british | 4 |
each of these | 4 |
as in some | 4 |
lip of the | 4 |
been given to | 4 |
external or internal | 4 |
of a fish | 4 |
the teeth and | 4 |
according to lamarck | 4 |
species of serpula | 4 |
the degree of | 4 |
plants on which | 4 |
applied by some | 4 |
the insertion of | 4 |
terminates in a | 4 |
to the right | 4 |
with the family | 4 |
near the outer | 4 |
corner of the | 4 |
near the anterior | 4 |
distinction from the | 4 |
a fine shell | 4 |
two or more | 4 |
to shew the | 4 |
of which we | 4 |
in the mud | 4 |
which are figured | 4 |
the margins of | 4 |
parietal valves four | 4 |
exposed to the | 4 |
across the cavity | 4 |
this family may | 4 |
a very small | 4 |
by the animal | 4 |
valves of the | 4 |
they are then | 4 |
may be described | 4 |
internal cast of | 4 |
the typical species | 4 |
the only species | 4 |
roots of the | 4 |
curve of the | 4 |
of the internal | 4 |
within the shell | 4 |
be able to | 4 |
at the same | 4 |
are the principal | 4 |
of the bivalve | 4 |
lip thickened and | 4 |
of the different | 4 |
surface of one | 4 |
specimens of the | 4 |
the animal lies | 4 |
containing the families | 4 |
the third section | 4 |
genus of geotrochus | 4 |
in the rock | 4 |
in which to | 4 |
the coast of | 4 |
several other species | 4 |
the order monopleurobranchiata | 4 |
must not be | 4 |
of molluscous animals | 4 |
in having but | 4 |
these may be | 4 |
considered as a | 4 |
the hinder part | 4 |
of which this | 4 |
and has been | 4 |
inner lip is | 4 |
a large and | 4 |
term used to | 4 |
the valves being | 4 |
one end of | 4 |
the under valve | 4 |
genus voluta of | 4 |
the bivalve shell | 4 |
an idea of | 4 |
animals of this | 4 |
the nucleus is | 4 |
some parts of | 4 |
is applied by | 4 |
the new species | 4 |
remarkable for its | 4 |
in the accompanying | 4 |
is well known | 4 |
common garden snail | 4 |
animal has a | 4 |
one of these | 4 |
remains of the | 4 |
to obtain a | 4 |
organs of locomotion | 4 |
the explanation of | 4 |
of teeth on | 4 |
shaped process in | 4 |
the notch at | 4 |
and these again | 4 |
slit near the | 4 |
each of the | 4 |
family may be | 4 |
and lateral teeth | 4 |
the british seas | 4 |
here and there | 4 |
placed at a | 4 |
it is most | 4 |
shell of the | 4 |
the outer edge | 4 |
few in number | 4 |
of our own | 4 |
opening in the | 4 |
is figured in | 4 |
a row of | 4 |
and low water | 4 |
to the size | 4 |
while in the | 4 |
thickness of the | 4 |
in other words | 4 |
and on the | 4 |
the dorsal part | 4 |
they consist of | 4 |
are united in | 4 |
by the large | 4 |
been considered as | 4 |
found attached to | 4 |
is the largest | 4 |
to the umbones | 4 |
now known to | 4 |
to the posterior | 4 |
the specimen is | 4 |
on the whorls | 4 |
the author of | 4 |
the same time | 4 |
impression in each | 4 |
the length is | 4 |
with a deep | 4 |
there are also | 4 |
is placed by | 4 |
the triangular disc | 4 |
the sessile cirripedes | 4 |
and the latter | 4 |
have been considered | 4 |
a canal at | 4 |
very small and | 4 |
a group of | 4 |
regularity of the | 4 |
are characterized by | 4 |
of the mollusca | 4 |
at present known | 4 |
as the apex | 4 |
of the pit | 4 |
separated under the | 4 |
as a specific | 4 |
separated on account | 4 |
outer lip thick | 4 |
is represented in | 4 |
which are characterized | 4 |
in shape and | 4 |
reversed species of | 4 |
met with in | 4 |
the two genera | 4 |
but differing in | 4 |
a shelly tube | 4 |
in the third | 4 |
the spiral cone | 4 |
the thinness of | 4 |
impression having a | 4 |
the cavity of | 4 |
genus derives its | 4 |
from this genus | 4 |
one which is | 4 |
from that genus | 4 |
genus founded on | 4 |
known from the | 4 |
umbo of the | 4 |
whorls of the | 4 |
a fissure near | 4 |
with a spiral | 4 |
with the anterior | 4 |
to the second | 4 |
common on our | 4 |
largest of the | 4 |
a specific name | 4 |
the genera included | 4 |
complete in parts | 4 |
shells are said | 4 |
the stems of | 4 |
is formed of | 4 |
be found on | 4 |
spread over part | 4 |
diverging cardinal teeth | 4 |
bivalves belonging to | 4 |
forms of the | 4 |
genus of fresh | 4 |
the first time | 4 |
rise to the | 4 |
to admit the | 4 |
may be made | 4 |
to the ventral | 4 |
plenty of fossils | 4 |
which the aperture | 4 |
the last genus | 4 |
which consists of | 4 |
also applied to | 4 |
series of sandstones | 4 |
large number of | 4 |
and have the | 4 |
but it is | 4 |
without a sinus | 4 |
from the original | 4 |
that it may | 4 |
roots of trees | 4 |
recognised by the | 4 |
place where the | 4 |
the coasts of | 4 |
impression not sinuated | 4 |
beneath the umbones | 4 |
by a thick | 4 |
the genus voluta | 4 |
in structure and | 4 |
the animals have | 4 |
in a spiral | 4 |
the arrangement of | 4 |
symmetrical conical univalves | 4 |
to include the | 4 |
produced into an | 4 |
species of cardium | 4 |
such species of | 4 |
shells are not | 4 |
desmids and diatoms | 4 |
lip not thickened | 4 |
of a little | 4 |
inner lip reflected | 4 |
the pedunculated cirripedes | 4 |
we find that | 4 |
with three or | 4 |
and several other | 4 |
and divided into | 4 |
fixed at the | 4 |
are known by | 4 |
the british isles | 4 |
from new zealand | 4 |
confounded with any | 4 |
of chambered shells | 4 |
danger of confounding | 4 |
the common name | 4 |
marine substances by | 4 |
are not very | 4 |
to it are | 4 |
in many species | 4 |
spiral at the | 4 |
be distinguished as | 4 |
to some of | 4 |
the irregularity of | 4 |
top edges gilt | 4 |
of which forms | 4 |
as in nautilus | 4 |
to marine bodies | 4 |
to the hinge | 4 |
idea of the | 4 |
the two species | 4 |
teeth and ligament | 4 |
not appear to | 4 |
from the last | 4 |
of the contents | 4 |
the right side | 4 |
attachment of the | 4 |
more ventricose than | 4 |
only on one | 4 |
of the smaller | 4 |
dorsal part of | 4 |
by having a | 4 |
which the shell | 4 |
when they are | 4 |
examples of the | 4 |
on our coasts | 4 |
the birds of | 4 |
on the british | 4 |
are among the | 4 |
species were brought | 4 |
a small portion | 4 |
applied generally to | 4 |
genus is composed | 4 |
centre of each | 4 |
a spiral univalve | 4 |
the next thing | 4 |
to the animal | 4 |
part of this | 4 |
two adductor muscles | 4 |
it is attached | 4 |
point of union | 4 |
enclosed in the | 4 |
in common with | 4 |
the penultimate whorl | 4 |
have been placed | 4 |
which consist of | 4 |
but one species | 4 |
very common in | 4 |
a name given | 4 |
derived from the | 4 |
composed of some | 4 |
in a soft | 4 |
them out of | 4 |
palleal impression having | 4 |
attached to a | 4 |
to those shells | 4 |
this shell is | 4 |
in the inner | 4 |
spire and aperture | 4 |
is brought from | 4 |
they are sometimes | 4 |
been applied to | 4 |
familiar with the | 4 |
opening and shutting | 4 |
of the right | 4 |
ending in a | 4 |
towards the centre | 4 |
is used in | 4 |
is known by | 4 |
a bunch of | 4 |
only genus of | 4 |
by the notch | 4 |
this singular genus | 4 |
with the umbones | 4 |
many new species | 4 |
a hole in | 4 |
in the characters | 4 |
a subgenus of | 4 |
is the last | 4 |
having the anterior | 4 |
by the body | 3 |
with two or | 3 |
species are mostly | 3 |
the umbones and | 3 |
the posterior dorsal | 3 |
tooth near the | 3 |
be taken to | 3 |
hundred and seventy | 3 |
resembling those of | 3 |
is sometimes used | 3 |
may be obtained | 3 |
but they have | 3 |
a notch in | 3 |
order conchifera monomyaria | 3 |
the second division | 3 |
in holes of | 3 |
to present a | 3 |
left in the | 3 |
of exquisitely coloured | 3 |
and other information | 3 |
to include those | 3 |
characterized by the | 3 |
a list of | 3 |
and a posterior | 3 |
cardinal teeth and | 3 |
the animal and | 3 |
divided into separate | 3 |
described in this | 3 |
the situations in | 3 |
operculum is one | 3 |
which are separated | 3 |
have already noticed | 3 |
order to distinguish | 3 |
are already acquainted | 3 |
composing this well | 3 |
is the genus | 3 |
is a handsome | 3 |
bores and inhabits | 3 |
or less globular | 3 |
to indicate the | 3 |
and south america | 3 |
close to it | 3 |
specimen has been | 3 |
is supposed to | 3 |
i think we | 3 |
genus belonging to | 3 |
receives its name | 3 |
has divided this | 3 |
of their shell | 3 |
the geology of | 3 |
together with the | 3 |
for shells of | 3 |
shore line to | 3 |
have been united | 3 |
two valves of | 3 |
the genus bulinus | 3 |
far north as | 3 |
shells should be | 3 |
soon as the | 3 |
of the under | 3 |
a ligamentary pit | 3 |
published at s | 3 |
upwards of exquisitely | 3 |
the internal cartilage | 3 |
england and wales | 3 |
kept in a | 3 |
formed by a | 3 |
genus of uniones | 3 |
takes its name | 3 |
is a remarkable | 3 |
a molluscous animal | 3 |
attached to sub | 3 |
of several small | 3 |
width of the | 3 |
in the water | 3 |
as a whole | 3 |
the other hand | 3 |
disc in the | 3 |
proportion of the | 3 |
the most common | 3 |
three feet in | 3 |
and there a | 3 |
and are found | 3 |
common and general | 3 |
generic characters are | 3 |
small external ligament | 3 |
strata of the | 3 |
impression sinuated posteriorly | 3 |
species of achatina | 3 |
margin of a | 3 |
of a former | 3 |
minute land shells | 3 |
have a thick | 3 |
been separated on | 3 |
the sides are | 3 |
and other authors | 3 |
substance passing through | 3 |
of many of | 3 |
includes all the | 3 |
collections of shells | 3 |
and in damp | 3 |
likely to be | 3 |
shell in a | 3 |
upper valve of | 3 |
with a thin | 3 |
of good hope | 3 |
one adductor muscle | 3 |
often to be | 3 |
the beaks are | 3 |
portion of a | 3 |
thin and brittle | 3 |
the width of | 3 |
has a large | 3 |
like the rest | 3 |
principal difference between | 3 |
the islands of | 3 |
the remainder of | 3 |
ends of the | 3 |
a very common | 3 |
the fruit is | 3 |
through the centre | 3 |
upon a prominent | 3 |
who wish to | 3 |
well as in | 3 |
cavity of the | 3 |
a familiar example | 3 |
all the genera | 3 |
to the left | 3 |
the spiral extremity | 3 |
genus of monodonta | 3 |
having a long | 3 |
to the centre | 3 |
sometimes used as | 3 |
the flat valve | 3 |
a thin epidermis | 3 |
but with the | 3 |
general form and | 3 |
what a number | 3 |
of the rocks | 3 |
name under which | 3 |
is a notch | 3 |
last whorl covers | 3 |
angles to the | 3 |
also by the | 3 |
the south sea | 3 |
the union of | 3 |
the true ligament | 3 |
in reference to | 3 |
to the shore | 3 |
from the latter | 3 |
the command of | 3 |
and other shells | 3 |
having the ligament | 3 |
his genera of | 3 |
enumerated by lamarck | 3 |
not having a | 3 |
other genera enumerated | 3 |
with a slit | 3 |
index of british | 3 |
the animal when | 3 |
from the silurian | 3 |
to prevent its | 3 |
the british shores | 3 |
small teeth on | 3 |
shaped cavity in | 3 |
naturelle des mollusques | 3 |
and advancing beyond | 3 |
the floor of | 3 |
animals of the | 3 |
distinguished as being | 3 |
be more properly | 3 |
in the present | 3 |
are figured in | 3 |
the rock pools | 3 |
they are separated | 3 |
to resemble a | 3 |
composed of eight | 3 |
completely closed by | 3 |
they form a | 3 |
some univalve shells | 3 |
on the body | 3 |
descriptions of new | 3 |
under the umbones | 3 |
in connexion with | 3 |
divided into a | 3 |
layer of shelly | 3 |
have reached the | 3 |
sand and mud | 3 |
three diverging cardinal | 3 |
genus described by | 3 |
proceed to the | 3 |
founded on a | 3 |
piece of cardboard | 3 |
in the original | 3 |
it among his | 3 |
species are natives | 3 |
the idea of | 3 |
of the common | 3 |
in one or | 3 |
central and southern | 3 |
bivalve is said | 3 |
lip very thick | 3 |
which they belong | 3 |
tendon passing through | 3 |
in having an | 3 |
be had separately | 3 |
known as the | 3 |
the part which | 3 |
of a hinge | 3 |
is from the | 3 |
greater number are | 3 |
the individuals of | 3 |
the baculite limestone | 3 |
genus of clausilia | 3 |
in use for | 3 |
shells may be | 3 |
on the under | 3 |
the process of | 3 |
by the point | 3 |
or less oval | 3 |
ponds and streams | 3 |
west india islands | 3 |
it belongs to | 3 |
to close the | 3 |
space between the | 3 |
is a well | 3 |
by those who | 3 |
and consisting of | 3 |
the operculum of | 3 |
by a central | 3 |
on the beach | 3 |
it does not | 3 |
a slit near | 3 |
the pacific ocean | 3 |
the descriptions of | 3 |
and in general | 3 |
or more valves | 3 |
you will recollect | 3 |
are of the | 3 |
situation of the | 3 |
you wish to | 3 |
and that the | 3 |
animal of the | 3 |
by the side | 3 |
the specific name | 3 |
the imaginary axis | 3 |