collected by Capt. Bayfield in Canada. 137 



the recent shells figured by Chemnitz, and now living in the Greenland seas, but if so the fossil 

 species constitute a marked variety, the varices being more slender and more lamellar at their 

 posterior ends. 



6. Mya fruncata (PI. XVII. fig. 5, 6.). Shell shorter than the common form, and the posterior truncation 



oblique, and inclined to the basal margin, and with a smaller sinus in the muscular impression. 

 This variety is identical with one found fossil by Mr. Smith in Bute, and considered as an extinct 

 species, but I have the same recent from the St. Lawrence, and intermediate varieties between it 

 and the normal form of 31. fruncata. 



7. Ml/a arenaria. One valve ; the same is also recent in the Gulf of St. Lawrence. I have not seen 



this shell, but it was identified by Captain Bayfield, who sent me recent shells from the same. 



8. Saxicava rugosa. Port Neuf. The two varieties of this species which prevail at Uddevalla are also 



common at Beauport. One of these I have figured in the Phil. Trans. 1835; PI. II., the other 

 with the umbones more central is figured in the annexed Plate XVII., fig. 7. There are inter- 

 mediate ones between these two. 



9. Tellina groenlandica, Beck. (PI. XVII., fig. 8 a., 8 b.). Also living in the Gulf of St. Lawrence ; and 



at the Icy Cape, according to Mr. G. Sowerby. 



10. Tellina calcarea, var.? Wahlenberg, p. 36. {T.proxima, Brown, T. triangularis, Phil. Trans. 1835; 



PI. XVII., fig. 9, 10, 11.). The fossil from Canada differs slightly from that which is so com • 

 mon at Uddevalla, and from the same which occurs fossil at Bute, both in its larger size and in 

 the form of the palleal impression, which does not extend so far forward. See PI. XVII 

 figs. 9, 10. I have a recent one from the Norway seas identical with the Uddevalla variety. 



11. Nucula. One broken valve which I have not seen. 



12. Mytilus edulis. 



13. Pecten islandicus. Living in the North Sea; not known as British, but occurring in the newer 



Pliocene beds in Scotland. 

 l^. Terebratula psittacea, var. Scarcely showing any of those traces of longitudinal striae which are com- 

 mon in the living species from Labrador, but considered by Dr. Beck and Mr. Sowerby to be 

 the same as the recent species, which has a wide geographical range, occurring in Greenland 

 and the Feroe Islands, and half-way between these islands and Denmark. 



15. Balanus Uddevallensis, Lin. {B. scoticus). Same as the large Balanus found fossil at Uddevalla, 



and not distinguishable from B. scoticus (genus Chirona of Gray), a British species found in 

 the German Ocean off" Scarborough. The Uddevalla and Beauport specimens are similarly 

 striated externally. (See Phil. Trans. 1835 ; p. 37.) 



16. Balanus miser, Gould, (PI. XVII., fig. 12 a,,) f. 12 b. is a single valve of an elongated variety. 



17. Echinus. Fragments apparently identical with a living species found in the Gulf of St. Lawrence. 



Although the fossil species amount to no more than sixteen, the number of indi- 

 viduals examined was very great, affording in this respect a striking analogy to the 

 deposits near Uddevalla in Sweden. This limited variety of species, so different 

 from that observed in the present fauna of the neighbouring gulf, seems to favour 

 the hypothesis that the climate was formerly much colder. 



For the sake of comparison I subjoin a list of the recent marine shells of the 

 Gulf of St. Lawrence, forwarded to me by Capt. Bayfield, in the naming of which I 

 have been assisted by Dr. Beck and Mr. George Sowerby. 



VOL. VI. SECOND SERIES. 



