138 



Mr. Lyell on Fossil and recent Shells 



2. List of Recent Marine Shells collected in the Gulf of St. Lawrence. 



1. Pholas crispata. 



2. Glycimeris siliqua. 



3. Solen Americanus. 



4. Solenocurtus nitidus, Sai/. 



5. costatus, Say. 



6. Mya truncata. 



7. arenaria. 



8. Pandora trilineata, Say. 



9. Anatina Leana, Conrad. (Cochlodesma Le- 



ana, Couthoui/, Boston Journ.) Rare in 

 Gulf of St. Lawrence. 



10. Mactra ovalis, Gould. (M. similis, Gray, 



MS. in Brit. Mus., Beechey Zool. T. xliv., 

 f. 8.) 



11. Mactra solidissima, Say. (M. giganteum, 



Chemnitz.) 



12. Mesodesma Jauresii. (Joannis in Mag. de 



Zool. t.liv. 1834.) 



13. Saxicava rugosa, both the varieties mentioned 



in the preceding list of fossil shells. 



14. Petricola pholadiformis. 



15. Tellina groenlandica, Beck. (Sanguinolaria 



fusca of American authors.) 



16. Venus mercenaria. 



17. Astarte borealis, var. 



1 8. sulcata. 



19. , probably N.S. 



20. , allied to compressa, perhaps identical. 



21. Cardium groenlandicum, Lamk. (Aphrodite 



columba, Lea ; Amer. Phil. Trans.) 



22. Cardium islandicum. 



23. Nucula myalis, Couthouy. 



24. concentrica, Say. 



25. 

 26. 



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. 



Mytilus edulis. 

 Modiola glandula, 

 Lawrence. 



plicatula? 



papuana. 



Pecten islandicus. 



magellanicus, Lamk. 



Ostrea Americana. 

 Balanus costatus. 



Gould. Rare in the St. 



Buccinum undatum. 



cyaneum, Brug. (Tritonium cya- 



neum, Beck.) Query var. of B. undatum. 



, N.S., allied to B. undatum. 



obsoletum. (Nassa obsoleta, Say.) 



Nassa trivittata, Say, 

 Puqjura lapillus, var. 

 Rostellaria occidentalis. (Aporrhais occiden- 



talis.) 

 Fusus carinatus, Lamk. 

 , allied to or identical with recent species 



from Icy Cape. 



, N.S., allied to F. turricula. 



. , N.S., also allied to F. turricula. (Murex 



turricula, Mont.) 

 Natica ampuUaria, Lamk. (N. heros, Say.) 

 Turritella erosa, Couthouy. 

 Littorina vestita. (Turbo vestitus, Say.) 



palliata. (Turbo palliatus, Say.) 



Lacuna vincta, Turton. 



Margarita striata. 



Crepidula fornicata. 



Patella testudinalis. (Lottia, Gray.) 



The torrents and rivers, says Capt. Bayfield, which flow into the St. Lawrence 

 sweep down annually into that estuary great numbers of fossil shells from the 

 modern tertiary deposits, so that they are mingled with living shells, and thus the 

 productions of two periods are confounded together. Of this intermixture there 

 appear abundant examples in a collection of shells dredged up by Capt. Bayfield 

 from the mud at the bottom of the Gulf of St. Lawrence, near the island of Bic, 

 where the water was between fifteen and sixteen fathoms deep. Among these the 

 recent shells may generally be distinguished by retaining their colour, animal mat- 

 ter, or hgaments. It is more difficult to feel sure respecting those which have 

 been exclusively derived from the tertiary deposits, but I have little doubt that to 

 this number belong several specimens of the Balanus Uddevallensis, (fifteen of 

 list No. 1.) and a Fusus, nearly alhed to F. lamellosus, Lam., a species now living at 

 Icy Cape, N. lat. 70°, and common at Uddevalla*. Both of these shells have been 



* Phil. Trans., 1835, p. 37, where it is called Rumphius, misprint for F. Bamjius. 



