[679] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 385 
gin usually nearly straight for at least half its length, sometimes a little 
convex and gradually sloping throughout. Surface with fine, somewhat 
irregular, concentric striz, slightly iridescent. Color white, with the 
umbos purple. Length, 4™™; height, 2.5¥™, 
Long Island Sound, near New Haven, 4 to 6 fathoms, shelly and grav- 
elly bottom, among bydroids and sponges (A. E. V.). 
Abra equalis Say. 
American Conch., Part iii, Plate 28; outer figures, 1831; Binney’s Say, p. 182, 
same plate; Stimpson, Check-List, p. 3, 1860. Amphidesma aqualis Say, 
Journ. Acad. Nat. Sci., Philadelphia, vol. ii, p. 307, 1822 ; American Conch., Part 
iii, Plate 28; Binney’s Say, pp. 100, 182. Semele cqualis Verrill, Amer. Jour. 
Science, vol. ili, p. 210, 1872. 
Florida and Gulf of Mexico to Cape Hatteras; rare and local farther 
north. Stonington, Connecticut, from cod-stomachs (Linsley). Fort 
Macon, North Carolina, abundant (Coues, Yarrow). Texas (Riemer). 
Charleston, South Carolina (Say). 
The occurrence of this southern species at Stonington needs confirm: 
ation. I have seen no specimens from north of Cape Hatteras. 
Fossil in the Miocene of North and South Carolina. 
CUMINGIA TELLINOIDES Conrad. Plate XXX, fig. 221. (p. 418.) 
Journ. Acad. Nat. Sci., Philad., vol. vii, p. 234, 1837; Gould, Invert., ed. i, p. 56, 
fig. 36; ed. ii, p. 79, fig. 390. Mactra tellinoides Conrad, Journ. Acad. Nat, 
Sci., Philad., vol. vi, p. 258, Plate 9, figs. 2,3, 1831. 
Cape Cod to Florida. Common in Vineyard Sound and Buzzard’s 
‘Bay, 3 to 12 fathoms; Long Island Sound, less common. Fort Macon, 
North Carolina (Coues, Yarrow). Florida (Conrad). Fossilin the Post- 
Pliocene of Nantucket Island, South Carolina, and North Carolina; in 
the Pliocene of South Carolina; and in the Miocene of Virginia and 
South Carolina. 
CERONIA ARCTATA Adams. (p. 426.) 
H. and A. Adams, Genera, vol. ii, p. 414, 1852; Gould, Invert., ed. ii, p. 80, fi 
391. Maclra arctata Conrad, Journ, Acad. Nat. Sci., Philad., vol. vi, p. 25 
Plate 11, fig. 1, 1331. Mesodesma aretata Gould, Invert., ed. i, :p. 57, fig. 39. 
gs. 
a 
ty 
Long Island to River Saint Lawrence. Stonington, Connecticut 
(Linsley). East Hampton and Montauk, Long Island (S. Smith). Nan- 
tucket (Gould). Common in Massachusetts Bay; Casco Bay, and East. 
port, Maine, rare. Nova Scotia (Willis). 
Donax fossor Say. 
Journal Acad. Nat. Sciences, Philadelphia, vol. ii, p. 306, 1822; Binney’s Say, pp. 
99, 226, Plate 61, fig. 2. 
This species may possibly occur occasionally on the Southern New 
England coast, but Iam not aware of any authentic instances. I have 
found it quite common living on the outer beach at Great Egg Harbor, 
New Jersey, and it has been found as far north as the southern side of 
Long Island. 
