[689] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 395 
very common in Buzzard’s Bay and Vineyard Sound, 1 to 5 fathoms, 
especially in soft mud, in coves; Chelsea Beach, etc., Massachusetts Bay, 
common; Casco Bay, rare. Nova Scotia (Willis). Huntington and 
Greenport, Long Island, rare, (S. Smith). 
SOLENOMYA BOREALIS Totten. 
Amer. Jour. Science, vol. xxvi, p. 366, fig. 1, h, i, 1834 (Solemya borealis); Gould, 
Invert., ed. i, p. 36; ed. ii, p. 50, fig. 372. 
Connecticut to NovaScotia. Newport, Rhode Island (Totten). Chelsea 
and Nahant, Massachusetts (Gould), Casco Bay and Portland Harbor 
Yare; Vineyard Sound, at Cuttyhunk Island, rare. Stonington, 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 Stimpson. Plate XXX, fig. 232. (p. 432). 
Shells of New England, p. 9, 1851; H. and A. Adams, Genera, vol. ii, p. 543, 
Plate 126, figs. 5, 5b, 1858; Gould, Invert., ed. ii, p. 154, fig. 462. Nucula 
limatula Say, Amer. Conch., ii, Plate 12, middle figures, 1831; Gould, Invert., 
p. 98, fig. 62. Leda limatula Stimpson, Shells of New England, p. 10, 1851. 
North Carolina to Gulf of Saint Lawrence. Common in Long Island 
Sound; Buzzard’s Bay; Vineyard Sound; Casco Bay, in 2 to 12 fathoms, 
soft mud; less common in the Bay of Fundy, 4 to 30 fathoms. Beanfort, 
North Carolina: (Stimpson, Coues). Huntington and Greenport, Long 
Island (S. Smith). Nova Scotia (Willis). The specimens from Long 
Island Sound are as large and fine as the northern ones. — 
Fossil in the Post-Pliocene of Canada, Virginia, North and South 
Carolina; and in the Pliocene of South Carolina. An allied species ( Y 
levis Say, sp., Conrad) occurs in the Miocene of Maryland and South 
Carolina. 
Yoldia myalis Stimpson; Gould, Invert., ed. ii, p. 160, fig. 467; Nucula 
myalis Couthouy, 1838. This is often confounded with Y. limatula, though 
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. myalis or Y. sapotilla may 
have been, in this case, mistaken for Y. limatula. 
YOLDIA SAPOTILLA Stimpson, 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 sapotilla Gould, Invert., ed. i, p. 100, fig. 61, 1841; Hanley, Recent 
Shells, p. 170, Plate 20, fig. 3. Leda ( Yoldia) sapotilla Stimpson, Shells of New 
England, p. 10, 1851. Yoldia arctica Morch, op. cit., p. 98, 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, 
27 V 
