INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 679 



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

 convex and gradually sloping throughout. Surface with fine, somewhat 

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

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



Long Island Sound, near New Haven, 4 to 6 fathoms, shelly and grav- 

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



Abra cvqualis Say. 



American Couch., Part iii, Plate 28 ; outer figures, 1831 ; Biuney's Say, p. 182, 

 same plate ; Stimpson, Check-List, p. 3, 1860. Amplildesma (equalis Say, 

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

 iii, Plate 28 ; Biuney'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. 



Cibiingia tellinoides Conrad. Plate XXX, fig. 221. (p. 418.) 



Journ. Acad. Nat. Sci., Philad., vol. vii, p. 234,1837; Gould, Invert., ed. i, p. 56, 

 rig. 36; ed. ii, p. 79, fig. 390. Maetra tellinoides Conrad, Journ. 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 I 

 the Pliocene of South Carolina ; and in the Miocene of Virginia and 

 South Carolina. 



Ceronia arctata Adams, (p. 420.) 



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

 391. Maetra arctata Conrad, Jouru. Acad. Nat. Sci., Philad., vol. vi, p. 257, 

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



Long Island to Biver 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 fossor Say. 



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

 99, 226, Plate 61, fig. 2. 



This species may x>ossibly occur occasionally on the Southern New 

 Eugland 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. 



