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. 

 Yery 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 Linne 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. 1C; ed. ii, p. 272, fig. 533. Crepidula unguiformis Stimpson, 

 Shells of New England, p. 30 7 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 cf 

 the coast of Maine, nor in the Bay of Fundy. Yery 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. ]X T at. Sciences, Philadelphia, vol. ii, p. 227, 1822 ; Gould, Invert., ed. 

 i, p. 160, fig. 15; ed. ii, p. 273, fig. 534. Crepidula glanca Say, op. cit., p. 226; 

 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. Yery 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 Eu- 

 pagurus longicarpus and Ilyanassa obsoleta, with which it is nearly always 



