356 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [650] 
the Gulf of Saint Lawrence, at Prince Edward’s Island, &c. Halifax 
(Willis). Saint George’s Bank (S. I. Smith). It is common in the shal- 
low and sheltered parts of Casco Bay, but has not been found east of the 
Kennebeck River, on the coast of Maine, nor in the Bay of Fundy. 
Very abundant in Vineyard Sound and Buzzard’s Bay, from low-water 
to 12 fathoms; in Long Island Sound, near New Haven, low-water to 6 
fathoms; Great Egg Harbor, New Jersey; and everywhere southward. 
Egmont Key and Tampa Bay, Florida (E. Jewett). 
Fossil in the Miocene of Maryland, North and South Carolina; Plio- 
cene of South Carolina; and Post-Pliocene of North and South Caro- 
lina, Gardiner’s Island, New York, and Nantucket Island. 
The fornicata of Linné was described as a Mediterranean species, and 
may not be identical with the American shell. 
CREPIDULA PLANA Say. Plate XXIII, fig. 127. 
Journal Acad. Nat. Sciences, Philadelphia, vol. ii, p. 226, 1822; Gould, Invert., 
ed. i, p. 159, fig. 16; ed. ii, p. 272, fig. 533. Crepidula unguiformis Stimpson, 
Shells of New England, p. 30, 1851; this Report, pp. 355, 417 (non Lamarck, 
1822). 
Massachusetts Bay to Florida and the northern shores of the Gulf of 
Mexico. Local and less abundant farther north, in Casco Bay, Maine; 
Nova Scotia (Willis); Gulf of Saint Lawrence (Bell, Dawson); and 
Saint George’s Bank (S. I. Smith). Not found on the eastern part. of 
the coast of Maine, nor in the Bay of Fundy. Very common in Vine- 
yard Sound, Buzzard’s Bay, and Long Island Sound, from low-water 
mark to 12 fathoms, on the outside of oysters, Limuli, and various dead 
shells, as well as on the inside of various dead univalve shells; in all 
these situations frequently associated with the preceding species, but 
no intermediate forms have been observed. 
Fossil in the Miocene of North and South Carolina; Pliocene of South 
Carolina; and in the Post-Pliocene of Gardiner’s Island, New York, 
North Carolina, South Carolina, and Florida. 
The Mediterranean shell, C. unguiformis Lamarck, is a distinct species. 
CREPIDULA CONVEXA Say. Plate XXIII, fig. 128. (p. 355.) 
Journal Acad. Nat. Sciences, Philadelphia, vol. ii, p. 227, 1822; Gould, Invert., ed. 
i, p. 160, fig. 15; ed. ii, p. 273, fig. 534. Crepidula glauca Say, op. cit., p. 2265 
Gould, Invert., ed. ii, p. 274, fig. 535; ed. i, p. 151, fig. 14. Crepidula acuta H. 
C. Lea, American Jour. Science, ser. i, vol. xlii, p. 108, Plate 1, fig. 4, 1842. 
Massachusetts Bay to Florida. Less abundant and local farther 
north ; at Quahog Bay, Maine; Nova Scotia (Willis); and Gulf of Saint 
Lawrence. Very common in Vineyard Sound, Buzzard’s Bay, Long 
Island Sound, shores of Long Island, and Great Egg Harbor, New Jersey. 
Fort Macon, North Carolina (Coues). Georgia (Couper). 
Fossil in the Post-Pliocene of Virginia and South Carolina. 
The distribution of this species is probably identical with that of Hu- 
pagurus longicarpus and Ilyanassa obsoleta, with which it is nearly always 
