690 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



flue sandy mud; common in Casco Baj^ and Bay of Fundy, 4 to 100 

 fathoms, mud. Greenport, Long Island (S. Smith). Massachusetts 

 Bay (Gould). Nova Scotia (Willis).* Labrador (Packard). Greenland 

 (Morch). 



This species seems to be unknown among our Post-Pliocene shells. 

 Having- examined several hundred specimens from many different local- 

 ities and depths, I am satisfied that it is i:)erfectly distinct from Y. lima- 

 tula, with which certain writers are inclined to unite it. 



Yoldia Goiildii. 



• Naciila Goiildii DeKay, Nat. Hist. New York, Mollusca, p. 180, Plate 13, fig. 

 221, 1843. 



This was originallj^ described by Dekay as from Long Island Sound. 

 I have seen no specimens corresponding with the description in all 

 respects. It is, perhaps, a short variety of 1'. sapotiUa. 



Yoldia obesa Stimpson, 1851. (p. 509.) 



H. aud A. Adams, Genera, vol. ii, p. 548, 1858 ; Gould, Invert., ed. ii, p, 155, fig. 

 4fi3. Leda obesa Stimpson, Proc. Boston Soc. Nat. Hist., vol. iv, p. 13, 1851 ; 

 Shells of New England, p. 10, Plate 2, fig. 1, 1851. NiiGida naviciilaris Migbels, 

 Boston Journal Nat. History, p. 323, 1843 (non Conthouy, Gould). 



Block Island to Gulf of Saint Lawrence. East of Block Island, 29 

 fathoms, rare ; Casco Bay and off" Cape Elizabeth, 30 to 95 fathoms ; 

 Bay of Fundy, 40 to 100 fathoms, rare; near Saint George's Bank, 110 

 and 150 fathoms (Packard). Massachusetts Bay (Stimpson). 



Yoldia thraciformis Stimpson, 1851. (p. 509.) 



Smithsonian Cheok-List, p. 2, I860; H. and A. Adams, Genera, vol. ii, p. 548, 

 1858 (thraciaif'ornm) ; Gould, Invert., ed. ii, p. 157, fig. 465; Miircb, op. cit., p. 

 21, 1857. JSfucida ihrac'uvformh Storer, Boston Jour. Nat. History, vol. ii, p. 122, 

 figure, 1838; Gould, Invert., ed. i, p. 97, fig. 66. Leda thraciwformis Stimpson, 

 Shells of New England, p. 9, 1851. Nacida navicularis Conthouy, Boston Journ. 

 Nat. History, vol. ii, p. 178, Plate 4, fig. 4, 1839, (young) ; Gould, Invert., ed. i, 

 p. 103. Yoldia angularis MoUer, op. cit., p. 92, 1842 (t. Miircb). 



Long Island to Greenland. Off Fire Island, south of Long Island, in 

 10 fathoms; and off' Race Point, Cape Cod, in 30 fathoms, (Stimpson). 

 Not uncommon, and of large size, in Casco Bay, 15 to 95 fathoms; and 

 Bay of Fundy, 10 to 100 fathoms; near Saint George's Bank, 85 fath- 

 oms (Packard). 



Leda tenuisulcata Stimpson. (p. 509.) 



Shells of New England, p. 10, 1851 ; Gould, Invert., ed. ii, p. 161, fig. 468. Nucnla 

 tenuisidcata Couthouy, Boston Journ. Nat. Hist., vol. ii, p. 64, Plate 3, fig. 8, 1838. 

 Nucida miiiuta Gould, luvert., ed. i, p. 101, 1841 (nan Fabricius, sp). 



Ehode Island to Gulf of Saint Lawrence. Common in Massachusetts 

 Bay, Casco Bay, and Bay of Fundy, G to 80 fathoms. Nova Scotia 

 (Willis). Newport, Rhode Island (t. S. Smith). Southern part of the 

 Gulf of Saint Lawrence (Whiteaves). Particularly abundant in Eastport 

 Harbor, 10 to 30 fathoms ; Saint George's Bank and vicinity, 40 to 150 



