202 



DiAPHANA DEBILIS (Gould). 



Bullet hyalina, Turton (1834), teste Jeffreys ; non Gmelin (1792). 



Bulla deUlis, Gould (1840). 



Akera suhamjulata, Moller(1842) ; teste Pilsbry, 



Bulla pellucida, Brown (1844). 



Amphispliiira peUueida, Loven (184G). 



Diaphana dehilis, Stimpson (1800) ; and Gould (1870). 



Amphisphyra dehilis, Verrill (1882). 



Grrand Manan, "taken alive in 6 fathoms, coarse sand, off Duck Island 

 moorings " (Stimpson). " Not uncommon in Casco Bay and Bay of Fundy, 

 and north\vard, in 6 to 50 fathoms " (Verrill). Fishing banks off Halifax 

 (Willis). Gaspe Bay (but specimens very small and identification doubtful); 

 and north shore of the Gulf of St. Lawrence, at Trinity Bay, in 25 fathoms, 

 sand (Whiteaves). 



Fossil in the Leda clay at Montreal (Sir J. W. Dawson). 



Diaphana hiemalis (Couthouy). 



Bulla hiemalis, Couthouy (1839). 

 Diaphai'.a hiemalis, Stimpson (1860). 

 Amphisphyra hiemalis, Verrill (1879). 



Grand Manan, "in forty fathoms mud, off' Long Island " (Stimpson). 



Cylichna alba (Brown). 



Volvaria alba, Brown (1827). 



Btdla triUcea, Couthouy (1838) ; and Gould (1845). 



Bulla corticata (Beck) Moller (1842). 



Cylichna alba, Loven (1846) ; et auct. subseq. 



Bidla nucleola, Reeve (1855). 



Cylichna alba, var. corticata, G. O. Sars (1878). 



Throughout the whole region, and northward, at depths of from 2 to 60 

 fathoms. Stimpson says that this shell is common at Grand Manan, Verrill 

 has taken it in the Bay of Fundy, CJanong in Passamaquoddy Bay, Ver- 

 kruzen in Annapolis Basin, and Willis on the Atlantic coast of Nova Scotia. 

 The writer has dredged specimens of the var. corticata at many localities in 

 the Gulf of St. Lawrence, and Packard at Caribou Island. On the Labrador 

 coast the ordinary form of the species has been dredged by Packard in 

 Chateau Bay and Sloop Harbour, and, according to Miss Bush, by the 

 Stearns expedition, at Dead Island, near Square Island. 



It has long been known to occur on the coast of Greenland and Norway. 



As a fossil, C alba has been found in the Leda clay at Riviere du Loup, 

 Montreal, and in the Pleistocene deposits of the Clyde, Scotland (Sir J. W, 

 Dawson). , 



