690 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



fine sandy mud; common in Oasco Bay 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 manj^ different local- 

 ities and depths, I am satisfied that it is perfectly distinct from Y. lima- 

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



Toldia Gouldii. 



Niiciila Gouldii DeKay, Nat. Hist. New York, Molluscaj p. 180, Plate 1.3, fig. 

 221, 1843. 



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

 I have seen no specimens corresponding wdth the description in all 

 respects. It is, perhaps, a short variety of T. sapotilla. 



YoLDiA OBESA Stimpson, 1851. (p. 509.) 



H. and A. Adams, Geuera, vol. 11, p. 548, 18.58 ; Gould, Invert., ed. ii, p, 155, fig. 

 463. Leda oiesa Stimpson, Proc. Boston Soc. Nat. Hist., vol. iv, p. 13, 1851 ; 

 Shells of New England, p. 10, Plate 2, fig. 1, 1851. Niicula navicularis Mighels, 

 Boston Journal Nat. PJistory, p. 323, 1843 (non Couthouy, Gould). 



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

 fathoms, rare ; Casco Bay and oft' 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 Check-List, p. 2, 1860; H. and A. Adams, Genera, vol. ii, p. 548, 

 1858 (thraciceformis) ', Gould, Invert., ed. ii, p. 157, fig. 465; Morch, op. cit., p. 

 21, 1857. Nuciila thracio'formis Storer, Boston Jour. Nat. History, vol. ii, p. 122, 

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

 Shells of New England, p. 9, 1851. Nucula navicularis Couthouy, Boston Journ. 

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

 p. 103. Yoldia angularis Moller, op. cit., p. 92, 1842 (t. Morch). 



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

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

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

 Bay of Eundy, 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. Xucula 

 tenuisulcata Couthouy, Boston Journ. Nat. Hist., vol. ii, p. 64, Phite 3, fig. 8, 1838. 

 Nucula minuta Gould, Invert., ed. i, p. 101, 1841 (non Fabricius, sp). 



Ehode Island to Gulf of Saint Lawrence. Common in Massachusetts 

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

 (Willis). Newport, Ehode Island (t. S. Snnth). Southern part of the 

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

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



