692 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Fossil iu 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, foufld 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. ZoiJl. Soc, London, 1847 ; H. and A. Adams, Genera, vol. ii, p. 540, Plate 

 125, figs. 7, lit, 1358. Area jK'xata Say, Jour. Acad. Nat. Sciences, Philad., vol. ii^ 

 p. 268, 1822 ; Gould, Invert., ed. i, p. 95, tig. 60 ; ert. 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 5 Buzzard's Bay; Vineyard 

 Sound ; Great Egg Harbor, New Jersey. On beach at Provincetown, 

 Massachusetts (S. 1. Smith). Staten Island and Long Island, abun- 

 dant (S. Smith). Fort Macon, North Carolina (Yarrow). Georgia 

 (Couper). West Florida (Jewett). Texas (Rcemer). 



Fossil in the Post-Pliocene of Gardiner's Island (!) (S. Smith) ; in the 

 Miocene of South Carolina. 



Arca ponderosa Say. 



Jouru. 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 

 ithe southern side of liong 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, it 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 Linn6. Plate XXXI, fig. 234. (pp. 307, 432.) 



Systema Naturte, ed. xii, p. 1157, 1767; Gould, Invert., ed. i, p. 121, fig. 82; ed. 

 ii, p. 183, figs. 483, 484. Mytilus horeaVis 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. Mi/tilus pellucidm Pennant, Brit. Zool., vol. iv, p. 237, Plate 66, fig. 

 '3, (t. Gould) = variety jje?i«cW«8 Gould, Invert., ed. ii, p. 184, fig. 484. Mytilus 

 natatus Dekay, op. cit., p. 182, Plate 13, fig. 223, 1843. 



'Circumpolar : Arctic Ocean south to North Carolina, on the American 

 coast; 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 



