ETC. 689 



very common in Biizzarcl's Bay and Vineyard Sound, 1 to 5 fathoms, 

 especially in softmnd, in coves; Chelsea Beach, etc., Massachusetts Bay, 

 common ; Gasco Bay, rare. ^N'ova Scotia (Willis). Huntiugton and 

 Oreenport, Long Island, rare, (S. Smith). 



SOLENOMYA BOREALIS Totten. 



Amer. Joiir. Science, vol. xxvi, p. 366, fig. 1, h, i, 1834 {Solemya borealis) ; Gould, 

 Invert., cd. i, p. 36 ; ed. 11, p. 50, tig. 372. 



Connecticut toNovaScotia. Newport, Rhode Island (Totten). Chelsea 

 and Nahant, Massachusetts (Gould). Gasco Bay and Portland Harbor 

 Tare; Yineyard Sound, at Guttyhunk Island, rare. Stoningtou, Connec- 

 ticut (Linsley). 



This species may prove to be only the mature state of the preceding, 

 but I have never seen specimens intermediate in character. 



YOLDIA LiMATULA Stimpsou. Plate XXX, fig. 232. (p. 432). 



Shells of New England, p. 9, 1851 ; H. and A. Adams, Genera, vol. ii, p. 548, 

 Plate 126, figs. 5, 5&, 1858; Gould, Invert., ed. ii, p. 154, fig. 462. micida 

 limatnla Say, Amer. Conch., ii, Plate 12, middle figures, 1831 ; Gould, Invert., 

 p. 98, fig. 62. Lecla limatula Stimpson, Shells of New England, p. 10, ]851. 



Xorth Carolina to Gulf of Saint Lawrence. Common in Long Island 

 Sound; Buzzard's Bay; Yineyard Sound; Gasco Bay, in 2 to 12 fathoms, 

 soft mud ; less common in the Bay of Fundy, 4 to 30 fathoms. Beaufort, 

 North Carolina (Stimpson, Cones). Huntington and Greenport, Long 

 Island (S. Smith). Xova Scotia (Willis). The specimens from Long 

 Island Sound are as large and fine as the northern ones. 



Fossil in the Post-Pliocene of Canada, Yirginia, North and South 

 Carolina; and in the Pliocene of South Carolina. An allied species (Y 

 loivis Say, sp., Conrad) occurs in the Miocene of Maryland and South 

 Carolina. 



Yoldia myalls ^i\m]-i^ovL] Gould, Invert., ed. ii, p. IGO, jSg. 467; Xucula 

 myalls Couthouy, 1838. This is often confounded with Y. limatula^t\\o\\gh 

 quite distinct. It is a more arctic species, ranging from Massachusetts 

 Bay to the Arctic Ocean and Spitzbergen, but it has not been found 

 south of Cape Cod, so far as known to me. The shells reported as such, 

 that I have seen, are Y. limatula. Gould reports the latter as from Nord- 

 land (McAndrew), but we suspect that Y. myalls or Y. sapotilla may 

 have been, in this case, mistaken for Y. limatula. 



YoLDiA SAPOTILLA StimpsoD, 1851. Plate XXX, fig. 231. (p. 509.) 



H. and A. Adams, Genera, vol. ii, p. 548; Gould, Invert., ed. ii, p. 159, fig. 466. 

 Nucula sajpoUlla Gould, Invert., ed. i, p. 100, fig. 61, 1841 ; Hanley, Eecent 

 Shells, p. 170, Plate 20, fig. 3. Leda (Yoldia) sapotilla Stimpson, Shells of New 

 England, p. 10, 1851. Yoldia arctica Morch, op. cit., p. 93, 1857 ^(t. Dawson, 

 from specimen ; non Y. arctica Sars). 



Long Island to the Arctic Ocean, comparatively rare and local, chiefly 

 in deep water, south of Cape Cod. Off Gay Head, 19 fathoms, soft mud ; 

 off Buzzard's Bay, 25 fathoms, sand ; east of Block Island, 29 fathoms, 

 S. Mis. 61 44 



