NEWER PLIOCENE MARINE SHELLS. 



1)7 



Panopa>a Bivonse. Crag; Sicilian 



Pliocene. 

 Crassina multicostata. Arctic Seas. 

 Tellina proxima. Arctic Seas. 

 Mya (Sowerby).* Arctic Seas ; 



North coast of America. 

 Pecten Islandicus. Arctic Seas; 



North coast of America. 

 Buccinum striatum (Sowerby).-\- 



Rissoa fallax. 



Trochus inflatus. 



Area pappilosa. 



Crassina Withami. 



Mactra striata. 



Nucula gibbosa; Sicilian Pliocene ? 



Saxicava. 



Nassa Monensis {Forbes). 



Oiiva (Murchison).% 



RECENT SHELLS OF NEW SPECIES, FROM THE FIRTH OF 

 CLYDE. 



Pecten Jamesoni. Bute. 



Landsburgii. Bute, Ayr. 

 Trochus Martini. Bute, Ayr. 

 perforatus. Bute. 



Fusus Boothii. Bute. 



umbilicatus. Bute. 

 Patella Forbesii. Bute. 

 Crassina Withami. ? Bute.§ 



* This Mya was considered by Mr Sowerby to differ in species from the 

 M. truncata, both from the shape and muscular impression. Mr Lyell in- 

 forms me he found it at Udevalla, and that it occurs both recent and fossil 

 in the St Lawrence. 



-f- Records of General Science, p. 134. 



X Silurian System, p. 533. 



§ A single valve of a new Crassina was dredged up in Rothsay Bay, 

 agreeing in shape and size with one sent to me by Mr Witham from York- 

 shire. Vid. pi. i. fig. 25. But the imperfect state of both the recent and 

 fossil specimens renders their identity doubtful. 



VOL. VIII. 



