242 THE ICE AGE IN CANADA. 



This shell has been found as yet only at RivitTe-du-Loup, where 

 the specimens however are as good as those now living in the flulf. 

 It will be observed, however, that though they liave the number 

 of teeth of Y, limatiihi, they approach in form to the allied species 

 or variety Y. H(i}>otUI(i, a shell wliich occurs in (ireenland and thence 

 to New England, and wliicli I strongly suspect is merely a short 

 variety bearing a similar relation to Y. liindtuld to that which 

 Mya Uddera/leiixiii bears to the ordinary M. truiiaitn ; but Jeffreys 

 considers it distinct. Y. s(ijioti//n is, I may mention, the Y. arctica of 

 Morch,as proved by a specimen from his collection now in my possession. 



Yoblifi myalis. Couthuoy. 



Fossil — Labrador ( Packard). 



Recent — Rivir-re-du-Loup ; Little Metis ; Kamouraska ; (laspe 

 (Wiiiteaves) to soutii of Cape Cod. This shell is supposed to be 

 identical with hyperhorea, Lovcn, from Spitzbergen. 



Leda /otiSd. Baird. 



Fossil — Vancouver Island (Dr. d. M. Dawson). 

 Pecten Gni'iddiidk'us. Chemnitz. 



Fossil — Leda clay, Portland and .Saco, Maine ; not yet found in 

 Canada. 



Recent— (lulf St. Lawrence (Whiteaves), in deep water 200 to .300 

 fathoms. 



This species is found in the Clyde beds and in Greenland ; and if, as 

 Jeffreys supposes, identical with /^ nimili.-i (Laskey), it is a shell of 

 very wide distril)ution in the Atlantic, as well as in geological time. 

 Tliough not yet found in Canada as a Pleistocene fossil, its occurrence 

 as a fossil in Maine and recent in the (iulf St. Lawrence, renders it 

 probable that it may yet occur in our Leda clays. 



Pecten fennicoxtatHH. Mighels. {= P. MoijtUdnirus. Lamarck.) 



Fossil — Leda clay, St. John, N.B. (Matthew). 



Recent— Labrador to Cape Cod. 



Tins sliell has not yet been found in the Pleistocene of tlie St. 

 Lawrence valley ; but since, according to Packard, it is common ia 

 Labrador, there is notiiing remarkable in its occurrence at St. John. 



Pecten Isldudirus, Ciiemnitz. 



Fossil— Rivicre-du-Lcmp; Quebec; Anticosti; Labrador (Packard); 

 St. John, N.R. (Matthew); Portland, Maine ; Cireenland (Mdller); also 

 Crag, Clyde beds, and Post-pliocene of Norway. 



