374 THE CANADIAN NATURALIST. [Yol. vi. 



Terehratella Spitzhergensis, Davidson. 



Fossil — Riviere-du-Loup. 



Recent — Murray Bay ; also deeper parts of Gulf of St. Law- 

 rence (Whiteaves) ; Nova Scotia (Willis). 



This species has been found in the Post-pliocene of Canada, 

 hitherto only at Riviere-du-Loup, and is rare. It was called 

 T. Lahradorensis, Sowerby, in former lists, which seems to be a 

 synonym. It appears to be a rare shell in every part of the Gulf 

 where it has hitherto occurred, except at Murray Bay, where it 

 is not uncommon, and is found attached to stones in 20 to 25 

 fathoms, associated with Rhynclionella psittacea. 



Class II. — Lamellibranchiata. 



Pholas (^Zirphea) crispata, Linn. 



Fossil — Maine (Packard). 



I have not found this species fossil in Canada, but it exists 

 as a living si i ell on the New England coast generally, in North- 

 umberland Strait ; Gulf of St. Lawrence, and according to Bell as 

 far to the north-west as Rimouski. Puget Sound (U. S. Expl. 

 Exped.) 



It has perhaps extended its northern limit to Canada since the 

 glacial period. On the European coast it is a northern shell, 

 reaching soutli to the Mediterranean. 



Saxicava rugosa, Linn (and var. Arcticay 



Fossil — Saxicava sand and top of Leda clay, Montreal ; St. Ni- 

 cholas ; Ottawa ; Quebec ; Murray Bay ; Riviere-du-Loup ; Trois 

 Pistoles ; Tadousac ; Labrador ; Lawlor's Lake, New Brunswick ; 

 Maine, &c. 



Recent — Gulf St. Lawrence ; coast of Nova Scotia ; and New 

 England and northern seas generally ; also west coast of America 

 as far as Mazatlan. (P. P. Carpenter). 



Very abundant in the more shallow portions of the Post-plio- 

 cene throughout Canada, and presenting all the numerous varie- 

 tal forms of the species in great perfection. It is relatively 

 much more abundant in the drift deposits than in the Gulf of 

 St. Lawrence at present. Pieces of limestone which have been 

 bored probably by this shell, are not rare in the drift at Mont- 

 real. 



This is a widely distributed Arctic species, and is found in 

 the Post-pliocene deposits of Europe, and as far back as the 

 Miocene. 



