248 THE ICE AGE IN CANADA. 



Margarita cinerea. Couthuoy. 



Fossil Riviere-du-Loup ; Portland. 



Recent Gaspe ; Labrador ; Riviere-du-Loup ; Little Metis ; 

 Murray Bay ; Greenland to New England ; var. striata, Dall, Sitka. 



Cydostrema (Mo'lleria) costulata. Moller. 

 Fossil Montreal ; Clyde beds ; Uddevalla. 

 Recent Gaspe ; Arctic seas to New England. 



Cydostrema Cutleriana. Clark. 



Fossil Montreal. Rare. 



This is an Arctic and British shell, as yet recognized only at 

 Montreal. 



Turritella erosa. Couthuoy 



Fossil Labrador ; Riviere-du-Loup ; Montreal ? 



Recent Little Metis ; Murray Bay ; Nova Scotia ; Greenland to 

 New England. 



Turritella reticulata. Mighels. 



Fossil Labrador (Packard). 



Recent Gasp^ ; Labrador to Gulf St. Lawrence ; also fishing banks, 

 Nova Scotia (Willis) ; British Columbia. 



My specimens received from Dr. Packard are marked T. costulata, 

 but seem rather to be the above species. 



Turritella acicula. Stimpson. 



Fossil Riviere-du-Loup ; Labrador (Packard). 



Recent Murray Bay ; coast of New England. 



There may be some reason to doubt whether this is not a variety of 

 T. erosa. It is quite possible that the above species should be regarded 

 as Mesalice. 



Campeloma decisum. Say. ( Paludina decisa, Say. ) 



Fossil Pakenham Mills, Saxicava sand. 

 Recent Eastern America generally. 



Valvata tricarinata. Say. 



Fossil Pakenham Mills, with the preceding. 



Recent Eastern America generally. 



Jeffreys regards this as a variety of V. piscinalis. 



