238 THE ICE AGE IN CANADA. 



Cryptodon Gouldii. Philippi. 



Fossil Montreal. Rare. Matthew records a species supposed to 

 be distinct from C. Gouldii at St. John. 



Recent Murray Bay; Gaspe (Whiteaves) ; Little Metis ; Kamour- 

 aska ; Greenland to New England. 



The European form C. flexuosa (Axinus flexuosus) is usually regarded 

 as distinct, and is found as far north as Spitzbergen, and in the Crag, 

 the Clyde beds, and the Norway Post-pliocene, and in British Columbia. 

 Jeffreys, however, considers the difference merely varietal, and it 

 certainly seems to dimmish or disappear in the northern and glacial 

 specimens. 



According to Mr. Whiteaves this species has a great range in depth 

 in the gulf of St. Lawrence, being found, living, from 20 to 300 fathoms . 



Sphaerium ? 



Fossil Pakenham Mills, with fresh-water bivalves and Tellina 

 Grcenlandica. The specimens were too imperfect for certain deter- 

 mination. 



Unio rectus. Lamarck. 



Fossil Clarenceville, Lake Champlain (Dickson), with Mya aren- 

 aria, Tellina Grcenlandica, &c. 



Recent River St. Lawrence. 



Unio Cardium ? Rafinesque. 



Fossil With the preceding. This and the preceding species were 

 represented by large and thick shells better developed than those of 

 the River St. Lawrence at present. It is probably the same with 

 U. ventricosus, Barnes. 



Unio ellipsis. Say. 



Fossil Toronto ; Interglacial Beds. 

 Recent River St. Lawrence. 



Mytilus edulis. Linn. 



Fossil Montreal ; Acton ; Riviere-du-Loup ; Quebec ; Chaudiere 

 Station ; Anticosti ; Labrador (Packard) ; Lawlor's lake, N.B. 

 (Matthew) ; Greenland (Moller). 



Recent North Atlantic and Arctic seas generally ; British Columbia 

 and North Pacific (= trossulus, Gould) ; as far south as Monterey. 



The variety most commonly found in the Pleistocene is a small, 

 oval, tumid form, allied to variety elegans of British writers. This 



