398 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [692] 
Fossil in the Post-Pliocene of Nantucket, Gardiner’s Island, Virginia, 
North and South Carolina; and in the Miocene of Virginia and North 
Carolina. According to Gould, found fossil at Provincetown,:Massa- 
chusetts,in an artesian boring, 120 to 200 feet beneath the surface, 
(Post-Pliocene ”) 
ARGINA PEXATA Gray. Plate XXX, fig. 227. (p. 309.) 
Proc. Zodl. Soc., London, 1847; H. and A. Adams, Genera, vol. ii, p. 540, Plate 
125, figs. 7, 7a, 1858. Arca pexata Say, Jour. Acad. Nat. Sciences, Philad., vol. ii, 
p. 268, 1822; Gould, Invert., ed. i, p. 95, fig. 60; ed. ii, p. 147, fig. 456. 
Florida and northern shores of Gulf of Mexico to Cape Cod; rare 
and local farther north, in Massachusetts Bay. Very common in Long 
Island Sound, low-water to 10 fathoms; Buzzard’s Bay; Vineyard 
Sound; Great Egg Harbor, New Jersey. On beach at Provincetown, 
Massachusetts (S. L Smith). Staten Island and Long Island, abun- 
dant (S. Smith). Fort Macon, North Carolina (Yarrow). Georgia 
(Couper). West Florida (Jewett). Texas (Roemer). 
Fossil in the Post-Pliocene of Gardiner’s Island (?) (S. Smith); in the 
Miocene of South Carolina. 
ARCA PONDEROSA Say. 
Journ. Acad. Nat. Sciences, Philadelphia, vol. ii, p. 267, 1822; Binney’s Say, p. 92. 
This species occurs on the beach at Edgartown, Martha’s Vineyard, 
associated with the other common sand-dwelling shells of that region. 
The valves are apparently tolerably fresh, though worn, and no. fossil 
shells have been found in that vicinity. It occurs in the same way on 
the southern side of Long Island, near Fire Island (S. I. Smith and S. 
Smith). But I am not aware that it has been found living north of 
Cape Hatteras; nevertheless, if may occur locally in shallow water off 
shore. The specimens found may possibly have been washed out from 
submerged Post-Pliocene deposits. 
It is found living at Fort Macon, North Carolina, and southward to 
the Gulf of Mexico. 
HETEROMYARIA. 
MYTILUS EDULIS Linné. Plate XX XI, fig. 234. (pp. 307, 432.) 
Systema Nature, ed. xii, p. 1157, 1767; Gould, Invert., ed. i, p. 121, fig. 82; ed. 
ii, p. 188, figs. 483, 484. Mytilus borealis Lamarck, Anim. sans Vert., ed. ii, 
vol. vii, p. 46; Dekay, Nat. Hist. N. Y., Moll., p. 182, Plate 13, fig. 222, Plate 
24, fig. 256. Mytilus pellucidus Pennant, Brit. Zodl., vol. iv, p. 237, Plate 66, fig. 
3, (t. Gould) = variety pellucidus Gould, Invert., ed. ii, p. 184, fig. 484. Mytilus 
notatus Dekay, op. cit., p. 182, Plate 13, fig. 223, 1843. 
Circumpolar: Arctic Ocean south to North Carolina, on the American 
eoast; south to Great Britain, France, and the Mediterranean and 
Black Seas, on the European coast; south to Monterey and San Fran- 
cisco, on the North Pacific coast; south to China and Japan, on the 
Asiatic coast. Very abundant in Great Egg Harbor, New Jersey, Long 
