[679] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 385 



gin usually nearly straight for at least naif its length, sometimes a little 

 convex and gradually sloping throughout. Surface with fine, somewhat 

 irregular, concentric stride, slightly iridescent. Color white, with the 

 umbos purple. Length, 4 mm ; height, 2.5 mm . 



Long Island Sound, near New Haven, 4 to G fathoms, shelly and grav 

 elly bottom, among hydroids and sponges (A. E. V.). 



Abra cuqualis Say. 



American Conch., Part iii, Plate 28 ; outer figures, 1331 ; Binney s Say, p. 182, 

 same plate; Stimpson, Check-List, p. 3, 1860. Aniphidcsma wqualls Say, 

 Jouru. Acad.Nat. Sci., Philadelphia, vol. ii, p. 307, 1822 ; American Conch., Part 

 iii, Plate 28; Binuey s Say, pp. 100,182. Semele equalis Verrill, Amer. Jour. 

 Science, vol. iii, 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 (Rcemer). 

 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. 



CiniiNGiA TELLINOLDES 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 tellinoidcs Conrad, Jouru. 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), Fossil in 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.) 



II. and A. Adams, Genera, vol. ii, p. 414, 1858; Gould, Invert., ed. ii, p. 80, fig. 

 391. Mactra arctata Conrad, Journ. Acad. Nat. Sci., Philad., vol. vi, p. 257, 

 Plate 11, fig. 1, 1831. Mcsodeama arctata Gould, Invert., ed. i, p. 57, fig. 39. 



Long Island to Kiver 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 fotssor Say. 



Journal Acad. Nat. Sciences, Philadelphia, vol. ii, p. 306, 1822 ; Binuey s Say, pp. 

 99, 226, Plate 61, fig. 2. 



This species may possibly occur occasionally on the Southern New 

 England coast, but I am 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. 



