124 



the southern coast, whence Say's type was derived, have a thinner shell with 

 an impressed, escutcheon, the middle of which pouts more or less strongly ; 

 the valve margin below the escutcheon has a projecting angle ; the shell is 

 somewhat compressed, compared with the northern form, and has a paler 

 and more delicate epidermis. Several of these characters are correlatives of 

 the latitude, but the extreme forms without a connecting series would be 

 taken by any careful observer for distinct species. Most of the conchologists 

 of the United States having resided north of Delaware, the northern form 

 is the more familiar both in books and collections, but it is not the original 

 type, and I have therefore given it a varietal name" (Dall, op. cit. supra.) 



NUCULA DELPHINODONTA, Mighels. 



Nuculu delpfiinodonta, Mighek (1842). 



Nucula corticata, (Holboll) Moller (1842) ; fide Morch. 



Grand Manan, 25 fathoms mud on the Hake ground (Stimpson) ; " Bay 

 of Fundy, and Eastport Harbour, 10 to 100 fathoms, mud, common" (Ver- 

 rill) ; Annapolis Basin, N.S., rather abundant (Verkruzen) ; fishing banks 

 off Halifax (Willis). Northumberland Strait, and off Grande Greve, Gaspe 

 Bay, in 50 fathoms, mud, dredged by the writer. 



Family Ledidcr.. 

 Leda minuta (MuUer). 



Area minuta, Mliller (1776) ; and 0. Fabncius (1780). 

 Leda minuta, Moller (1842) ; et auct. 



Fishing banks off Halifax, rare (Willis). Off Grande Greve, Gaspe Bay, 

 in 50 fathoms, mud (1869) and off Cap des Hosiers village (1869) dredged by 

 the writer ; Little Metis and Kamouraska (Sir J. W. Dawson). Labrador 

 coast, at Long Island, 15 fathoms ; Henley Harbour, 20 fathoms ; Chateau 

 Bay, 50 fathoms ; and Square Island, 30 fathoms (Packard). Greenland 

 (Fabricius). 



Also, fossil in the Leda clay at St. John, N.B. ; Riviere du Loup and 

 Montreal. 



Leda pernula (Muller). 



Area pernula, Muller (1779) ; fide Loven. 

 Area rostrata, Gmelin (1J92) ; tide Loven. 

 Leda j^ernuJa, Loven (1846) ; et auct. 



Off Halifax, N.S., in 59 fathoms; a typical example, dredged in 1887 

 (Verrill). Off Grande Greve, Gaspe Bay, in 50 fathoms, mud, dredged by 

 the writer; Little Metis and Kamouraska (Sir J. W. Dawson). Port Bur- 

 well and Ashe Inlet, Hudson Strait (Bell). 



