Of the Vicinity of Montreal. 425 



i-.cludes numerous specimens of Buccimim undatum, but none of 

 them present the peculiarities of the fossil variety. Fusus torna- 

 tus is represented by a single specimen, quite similar to the fossil 

 individuals. Natica heros is abundant, as are Mytilus - edulis, 

 Mya arenaria, Tellina groenlandica, Littorina palliato, and Pecten 

 Islandicus. There is a single specimen of Tellina calcarea, said 

 to have been found in brackish water at Bay St. Paul. Scalaria 

 groenlandica, Mya truncata, Astarte Sulcata, and Cardium Tslan- 

 dicum are represented by single specimens. Balanus crenatus 

 and a Spirorbis, apparentl}'^ naiitiloides, are attached to mussels 

 and to Pecten Islandicus. Saxicava rugosa does not appear in 

 the collection. Purpura lapillus, Mactra ovalis, Littori tenebro- 

 sa, Solen eusis and Mesodesma arctata, aie numerous, though 

 they have not yet been found in the tertiary clays. 



The specimens of Mya arenaeia are large and coarse in com- 

 parison with those found at Montreal. Tbe mussels have not the 

 antique form. Tellina groenlandica has precisely the character 

 of the fossils ; and the more common variety, (Sanguinolaria fusca) 

 is also represented by specimens said to have been found in 

 brackish water. 



The collection maybe regarded as showing the prevalent shells, 

 in that part of the gulf of St. Lawrence nearest to those ancient 

 extensions of the same gulf described in this paper. 



Other materials have been accumulating since the above paper 

 was written ; and I hope in some future UMYohev oi\h.Q Naturalist 

 to follow up the subject. 



EEFERBNCE TO FIGURES. 



Fig. 3. Bulla oryza, 



4. Bulla debilis, Do. 



5. Buccinum ciliatum, . . . . . Do. 



6. Admete viridula, ..... Do. 

 Y. Menestho albula, , . ... . Do. 



8. Turritella erosa (fragment), . . . Do. 



9. Acmaea caeca, ...... Do. 



10. Velutina Zonata, . . . ... Do. 



11. Leda pygmaea? nat. size and magnified, . Green's Creek. 



12. Ledaminuta, Montreal. 



13. Mytilus edulis (var. Laurentiana), . . Do. 



14. Cytheridea (nat. size and magnified), . Do. 



15. Spirorbis sinistrorsa (nsut. size and magnified). Do. 



16. Sponge (Tethea Logani), (a) nat. size in situ, (6) spicules, (cd) 



large spicules magnified. 



Montreal. 



