240 THE ICE AGE IN CANADA. 



Crenella glandula. Totten. 



This species, which is at present quite common in the Gulf St. 

 Lawrence, is indicated in my formerly published lists as a Montreal 

 fossil ; but I have mislaid the specimens, and cannot therefore now 

 repeat the comparisons with the recent shells. It is probably C. faha 

 of Fabricius. 



According to Mr. Whiteaves this is quite distinct from C. decussata^ 

 Montagu, both being found living in Gaspe. 



Nuctda tenuis. Montagu. 



Fossil — Leda clay, Montreal ; Saco (var. inflata) ; Riviere-du-Loup, 

 Bay de Chaleur (Matthew) ? Green's Creek, Ottawa River. 



Recent — North Shore; also Gulf St. Lawrence to Gaspe (Whiteaves) ; 

 Little Metis (type and var. injlata ; also European coasts and British 

 Columbia. 



N. expansa. Reeve. 



Fossil — Leda clay and boulder-clay. Riviere -du- Loup ; Saco; 

 Westbrook, Duck Cove, St. John, N.B. (Matthew) ; Pakenham ? 



Recent — Labrador (Packard); Murray Bay; Little Metis; Arctic 

 seas. 



I doubt if this is not a large and well-developed northern form of 

 N. temds. 



N, antiqua. Morch. From Leda clay of Maine ; seems to be a variety 

 of the last. 



Leda pernula. Muller. 



Fossil — Leda clay, Riviere-du-Loup ; New Richmond ; New Bruns- 

 wick (Matthew) ; Portland ; Saco; Lawlor's Lake, N.B. (Matthew). 



Recent — Little Metis ; Kamouraska ; Arctic seas and south to New 

 England. 



This shell occurs very abundantly at Riviere-du-Loup ; and the 

 specimens found there show that no specific line can be drawn between 

 the forms known as pernula, buccata (Steenst.), tenuisulcata, Gould, and 

 Jacksonii, Gould. Slender and flattened varieties are pernula and 

 tenuisulcata, shorter and more tumid forms are buccata ; and specimens 

 decorticated so as to show the origin of the hinge teeth are Jacksoni. 

 Comparison of specimens from Greenland, Norway, Labrador, the 

 Gulf St. Lawrence, and New England, confirms this conclusion. 



