238 THE ICE AGE IN CANADA. 



Cryptodon Gouldii. Philippi. 



Fossil — Montreal. Rare. Matthew records a species supposed to 

 be distinct from C. Goiddii at St. John. 



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

 aska ; Greenland to New England. 



The European form G. Jlexuosa [Axinus Jlexuosus) 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 diminish 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 

 Groenlandica. The specimens were too imperfect for certain deter- 

 mination. 



Unio rectus. Lamarck. 



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

 aria, Tellina Groenlaiidica, &c. 



Recent — River St. Lawrence. 



U7iio 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 edidis. 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 {= trossidus, 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 



