254 THE ICE AGE IN CANADA. 



Acirsa Eschrichtii. Holboll. 



Fossil Quebec ; Riviere-du-Loup ; Montreal ; most abundant at 

 Riviere-du-Loup. (Plate VI., Fig. 7.) 



Recent Murray Bay ; Little Metis ; Greenland ; also Eastport 

 (Verrill). 



This shell was named in former papers Menestho cdbula, the eroded 

 specimens found being referred to that species. It has, however, been 

 correctly described by Dr. Beck in Lyell's paper on Beauport, and 

 named Scalaria borealis. It is not this species of Gould, however. 



Trichotropis borealis. Brod. and Sow. 



Fossil Montreal ; Riviere-du-Loup ; Chaudiere Station ; Labra- 

 dor, &c. Very abundant at Montreal. 



Recent Labrador ; Little Metis ; Murray Bay ; Gaspe ; Arctic 

 seas ; and as far south as Massachusetts ; Alaska (Dall). 



Trichotropis arctica? Middendorff. 



Fossil Montreal. Very rare. (Plate VI., Fig. 8.) 



A single imperfect specimen represents this species, which is recent 



at Alaska (Dall) and Behring's Straits. The identification is perhaps 



doubtful. 



The figure given by Reeve of T. Kenseri of Phillippi from Spitz- 



bergen, resembles our shell, except in the small number of revolving 



bands. 



Admete mridula. Fabricius. 



Fossil Montreal ; Chaudiere Station. 



Recent Labrador (Packard); Little Metis ; Riviere - du - Loup ; 

 Murray Bay ; Gaspe (Whiteaves) ; also Greenland, Labrador and 

 British Columbia. It is the Tritonium mridulum of Fabricius, and is 

 a rare shell in the Canadian Pleistocene, and in the Gulf of St. 

 Lawrence. 



Aporrhais occidentalis. Beck. 



Fossil Labrador (Bayfield) ; also Packard. 



Recent Little Metis ; Gaspe ; Labrador to Massachusetts. 



It is remarkable that this species, which is found living from 

 Labrador to Cape Cod, is so rare in the Pleistocene. 



Ptychatractus ligatus (= Fasciolaria ligata, Mighels). 



Fossil Montreal ; very rare. 



Recent Murray Bay ; Mingan (Foote) ; Gaspe (Whiteaves) ; Nova 

 Scotia (Willis) ; rare in all these localities. 



