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(Read Ajml 11th, 1892.) Through the palseontological writings of Salter, Billings, Daw- son, Honeyman, Hall and Jones — the fauna of the Silurian rocks of Arisaig have been made widely known and notable both on account of the abundance and varietj'^ of its forms, as well as on account of the remarkable continuity and unbroken sequence of the strata from which these organic remains have been obtained. In the Quarterly Journal of the Geological Society of London, in the Canadian Naturalist, and Nova Scotian Institute of Natural Science Transactions, as well as in the Reports of the Geological Survey of Canada, the above-mentioned authors have described and recorded numerous new, interesting and previously imknown forms. During the season of 1886, Mr. T. C. Weston, accompanied by Mr. J. A. Robert, made important collections of fossils in the rocks constituting the stratigraphical series at Arisaig, along the coast, in connection with the geological work entrusted by Dr. Selwyn to Mr. Hugh Fletcher, and amongst them were several new and hitherto unrecorded forms, besides good examples of species which had been previously considered or doubtfully identified. These collections, as well as others from Nova Scotia, having been placed in my hands for determination during the season of 1886-87, I have applied myself to identify the various forms present. Amongst the Arisaig collections alone I have been able to recognise no less than 163 species, which are divisible into groups as follows : — 4 ' » • • « »■ >\« •• • f 1 18G SILUKIAN F(JSSILS FUOM AKISAIG, NOVA SCOTIA— AMI. No. of Species. Planbe 3 Rhabdophora Polypi 8 Brachiopoda 44 Laiiiellibranchiata 59 Pteropoda 8 Gasteropoda 9 Cephalopoda 13 Vermes 4 Ostraeoda 7 Trilobita Merostomata 1 Total 103 The species included in the above enumeration are all Silurian (Upper Silurian), and represent horizons from the base of that epoch to its summit, which, according to the New York and Ontario system and equivalencies, would indicate from the Medina to the Lower Helderberg, both inclusive, and according to British nomenclature, include from the Llandovery to the upper members of the Ludlow. It is but natural to point out here that, in examining the fauna of these Arisaig rocks, I have found a most intimate relation existing between it and the fauna of rocks assigned to a similar horizon in Europe along the Atlantic border. In fact, the intimacy may be said to be much closer between the Arisaig fossils and those, for instance, of the Ludlow rocks of Kendal, in Westmoreland, England, than with either the Silurian rocks of Anticosti, of Ontario or of New York State. The following is a classified list of the organic remains collected by Mr. T. C. Weston in 1886 in Divisions A, B, B', C and D of the Arisaig Section, according to the late Rev. Dr. Honeyman and Mr. Hugh Fletcher, B. A. It is hoped to supplement this catalogue shortly with full descriptions of the new forms herein mentioned, and notes on other interesting species, which are but little known or previously unrecorded 5. a 7. 8. 9. 10. 11. 12. 5 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. • •••• ,'• •• • ••••• • ••• • .•• >•••,• • • • -, • • • • •••• .».• , •-•• • ••• • • 11. cies. Silurian e of that fork and t'roni the iccording Y to the the fauna 3 relation a similar r between low rocks dther the : State. s collected ) and D of cioneyman with full 1 notes on previously SILUllIAN FOSSILS FKOM AHISAIf;, NOVA SCOTIA— AMI. 187 SILURIAN FOSSILS FKOM AKISAIfi, NOVA SCOTIA. LIST OF SPECIES. Planivk, 1. 2. 3. 4. 5. (). 7. 8. 9. 10. 11. 12. 13. 14.. 15. 16. 17. 18. 19. 20. 21. 22. 28. 24. 25. Pah^ophycus sp. Psilophyton {'.) sp. Obscure fucoidal remains, uncertain. Rhabdophoua. Monograptus Clintonensis, Hall. Halli, Barrande. Riccartonensis, Lapworth Sandersoni (?) Lajnvoi'th. sp. indt. (0 .sp. (?) « Polypi. Cladopora seriata, Hall. Streptelasma patula, Rominger. " sp. nov. Brachiopoda. Lingula spathata, Hall, rectilatera, Hall, lamellata ? Hall, oblonga, Conrad. " sp. indt. Leptobolus sp. Discina tenuilamellata, Hall. V. subplana, Hall. Vanuxemi, Hall. " sp. Pholidops implicata, Sowerby. Chonetes Nova-Scotica, Hall, tenuistriata, Hall. 188 SILURIAN FOSSILS FUOM AHISAIO, NOVA SCOTIA — AMI. 2(). 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57. 58. 59. v60. Orthis ele^tuituhi, Dalinan. " hy))ri(la ? Sowerl>y. " Hubcarinnta, Hall. n. sp. " poly^raiimia, Sowerby. " rustica, Sowerby. " sp. indt. Platyatrophia biforata, v. lynx, Eichwakl. Skenitlium pyramidale, Hall. Strophomena euglypha ? Sowerby. " rhomboidalis, Wilckens. " expansa, Sowerby. corrugata ? Conrad, subplana, Hall, varistriata, v. arata, Hall Spirii'er crispus ? Hisniger. " rugaecostus, Hall. " subsulcatus, Hall. Atrypa reticularis, Linnaiiis. sp. Rhynchonella aequiradiata, Hall. " emacerata, Hall. " formosa, Hall. " neglecta. Hall. " sinuata, Hall. Saffordi, Hall. " sp. indt. Pentamerus Knighti, Sowerby. (?) sp. Leptocoelia hemispherica, Sowei'by. " intermedia. Hall. Lamellibranchiata. Orthonota curta, Hall. " incerta, Billings. " siniulans ? Billings. " n. sp. ()2.| 63. 64.1 65. 66. 67. ()8. 69. 70. 71. 72. 73. 74. 75. 76. 77. 78. 79. 80. 81. 82. 83. 84. 85. 86. 87. 88. 89. 90. 91. 92. 93. 94. 95. 96. J A— AMI. i (12 64. 05. ()6. ar. ()8. (>9. 70. 71. 72. 73. 74. 75. 7(j. 77. 78. 79. 80. 81. 82. HILUHIAN FOSN.Ls FROM ARlSAin, N„VA SCOTIA-AMr. 189 Orthonotrt ,sp. in, it. ? Leptodoiiius truncatus, McCoy. 83. 84. 85. 86. 87. 88. 89. 90. 91. 92. 93. 94. 95. 96. Sanguinolites ttn^mlifems, McCoy. carinatus, McCoy (.sp ) GrammyHia Acadica, Bill iugs. cingulata, Hisinger. '^'^^i* triangulata, Salter, remota, Billings. Goniophora bellula, Billings, transiens, Billinrrs " XT * -iV. sp. sp. indt, Cleidophorus erectu.s, Hall. concentricus, Hall, cuneatu.s, Hall, nuculifornn'.s, Hall, semiradiafcus, Hall, subovatiis, Hall, sp. allied to C. subovatus, H Anodontopsis angustifrons, McCov ?N.sp. Cucullella elongata, Hall, sp. ( = Cleidophoruselongatus, H.) Cucullella N. -. No. 1. « ' •>' N. sp No. 2. Cytherodon ? placidus, Billings. socialis, Billings. N. sp. Ctenodonta angusta, Hall sp. n- var. or n. sp. attenuata, Hall sp. n. sp, equilatera, Hall sp. elliptica, Hall, sp. indt. Megambonia cancellata, Hall, hians ? McCoy. 190 SIM'HIAN FOSSILS FROM AIMSAFO, NOVA SCOTIA— AMI. Vj I ■ 97. Mu^'juiiltoniii Ntriutii, Hull. 129. 9.S. M()antuluin, Dawson. 13(). " longicaiiieratuin ? Hall. 137. " exornatuiii, Dawson. 13tS, " piinctostriatum, Hall. 130. " vir^atuni ? Sowerby. 140. " rioi.luni ? Hall. 141. " sp. No. 1. 142. " sp. No. 2. 143. " sp. No. 3. 144. " sp. No. 4. 14.5. Oncoceras sp. VERMES. 146. Conchicholites sp. 147. Cornulites flexuosus, Hall. 148. " " V. gracilis, Hall. 140. Serpulites dispar, Salter OSTRACODA. 150. Priniitia niundula, Jones. 151. " ovata ? Jones and Hall. 152. Beyrichia a3quilatera, Hall. 153. " tviberculata, Khieden. 154. " " V. pustulosa, Hall. 155. " " V. strictispiralis, Jones. 15C. " " V. Ncetlingi, Renter. 192 .SILURIAN FOSSILS FUOM AUISAKJ, NOVA SCOTIA — AMI. THILOHITA. 157. Calyint'ne Hluniunbuchi, Brongnmrt. \!)H. Homaloiiotus ,sp. 159. " Daw.soni, Hall. ICO. Phacops i H\\ 101. Dalnuuiia Lo^'aui, Hall. 102. Acidaspis tuberculatuH I Conrad. MERO.STOMATA. 108. StylonuiUH ? .sp. nov. OriAWA, March 7th, 1892. i, .^!