PLEISTOCENE FOSSILS. 239 



variety still lives at Tadoussac, and is apparently characteristic of 

 situations where the water is cold and exposed to intermixture of fresh 

 water. The ordinary variety occurs at Portland, and also in some of 

 the upper beds at Riviere- du-Loup. At Montreal only the small oval 

 variety occurs. This variety is also found in the Clyde beds and in 

 the Crag. 



Modiola modiolus. Linn. 



Fossil Montreal, very rare. 



Recent Labrador to New England ; very common on the coasts of 

 Nova Scotia and New England ; North Pacific ; found sparingly along 

 the Vancouver and Californian coasts till it is replaced in the Gulf 

 fauna by M. capax, Conrad. 



This species becomes rare to the northward ; and this, as well as its 

 being proper to rocky shores rather than to clays and sands, may 

 account for its rarity in the Canadian Pleistocene. It is, however, 

 common in the glacial beds of Europe. 



Modiolaria nigra. Gray. 



Fossil Montreal ; Riviere-du-Loup (small variety nexa ; also large 

 and fine) ; very large and well preserved in nodules at Kennebeck, 

 Maine ; Labrador (Packard, if his M. discrepans as I suppose) ; Black 

 Point, N.B. ? (Matthew). (See Plate V., Fig. 5.) 



Recent Gulf of St. Lawrence (Whiteaves) ; Little Metis ; Riviere- 

 du-Loup. Very large and fine on coast of Nova Scotia (Willis) and as 

 far north as Greenland (M. discors, L. ) ; British Columbia. 



Modiolaria corrugata. Stimpson. 



Fossil Riviere-du-Loup. 



Recent Murray Bay, Little Metis and Cacouna ; precisely similar 

 to the shells from the Pleistocene. Also Greenland (Moller) ; Labrador 

 (Packard) ; and south to Cape Cod. 



Modiolaria discors. 



Fossil Beauport, of good size ; Greenland (Moller) ; Montreal (Mr. 

 Kennedy). 



Recent Labrador to New England ; Little Metis ; Riviere-du- 

 Loup ; British Columbia. Specimens from Gaspe are precisely similar 

 to the fossil. This shell is no doubt identical with M. loevigata of 

 Gray, and possibly with the M. discrepans of some other authors. 

 It is, however, the same with that figured in Binney's Gould as 

 M. discors. 



