CYPRINA. 129 



striae. Color pale yellowish-gTccn, with fine pencilliiigs of dusky 

 radiations. There is a, remote hiteral tooth on the antcri<n- margin. 

 Diameters, one fourth of an inch ; width, one tenth of an inch. 



This shell was described from a single valve found by Kev. James 

 H. Linsley at Stonington, Connecticut, in the stomach of a haddock. 

 New Bedford Harbor, in four fathoms gravel (^Prime and Stunp- 

 sori) ; on the coast of South Carolina (^Kirrtz'), where it also occurs 

 in post-pleiocene deposits. Its peculiar form, and the fine radiating 

 stria? between the ribs, are peculiar. 



Oeiius CYPRIXA, Lam. 1818. 



Shell obliquely heart-shaped, beaks prominent ; hinge with three 

 unequal, diverging cardinal teeth, and a remote marginal one ; pal- 

 lial impression simple. 



Cyprina Islandica. 



Shell ponderous, ventricose, round-ovate, inequipartite, shortest and com- 

 pressed anteriorly ; lunule none ; epidermis chestnut-brown, thick, and coarsely 

 wrinkled ; edge simple. 



Pectunculus mnxhnns. Lister, Couch, t. 272, fig. 108. 



Pectuncidus crassiis, Da Costa, Brit. Conch. 183, pi. 14, fig. 5. 



Venus Islandica, Lin. Syst. Nut. 1131. — Gmelin, Syst. 3271. — Montagu, Test. Brit. 

 114. — Maton and Rackett, Lin. Trans, viii. 83. — Wood, in Lin. Trans, vi. t. 17, 

 figs. 1, 2; Index Test. pi. 7, fig. 41 ; Dorset Catal. 35, pi. 6, fig. 5. — Dillwyn, 

 Catal. i. 176. — Chemn. Conch, vi. 340, pi. 32, figs. 341, 342. — Donovan, Brit. 

 Shells, iii. i)l. 77. — Muller, Zool. Dan. i. 29, pi. 28, fig. 5. — Turton, Conch. 

 Diet. 238. — EoMER, Krit. Untersueh. 36. 



Venus mercenaria, Pennant, Brit. Zool. iv. 94, pi. 53, fig. 47. 



Venus hucardium, Born, Mus. pi. 4, fig. 11. 



Cyprina Islandica, Lam. An. sans Vert. 2d ed. vi. 290. — Deshayes, Encyc. Me'th. Vers, 

 1. 46, pi. 272, fig. 6. — Blainv. Malacol. pi. 70 bis, fig. 5. — Turton, Brit. Biv. 135. 

 — Fleming, Brit. Anim. 444. — Hanley, Recent Shells, i. 65. — Sowerby, Thes. 

 Conch, i. pi. 168, figs. 1, 2, 3. — Forbes and Hanley, Br. Moll. i. 441, pi. 29, pi. M. 

 fig. 4 (animal). — Lov^n, Ind. Moll. Sc. 38. — Crouch, Intr. Conch pi. 7, fig. 2. — 

 Gray, Cat. Br. Mus. (Br. Moll.) 9. —Adams, Gen. ii. 444, pi. 110, figs. 4, 4a.— 

 Ciienu, Man. Conch, ii. 103, figs. 458-460. — KiJSTER, in Chemn. 2d ed. {Venus) 

 pi. 5, figs. 1, 2. — Deshayes, Cat. Br. Mus. (Biv.) 200. — Reeve, Conch. Syst. pi. 

 65; Elem. Conch, ii. 114, fig. 190. 



Cyprina vulgaris, Sowerby, Genera, pi. 38, fig. 11. — Brown, Conch. III. 93, pi. 31, fig. 

 1 ; Coneh. Man. fig. 116. —Reeve, Conch. Syst. pi. 65. 



Arctica vulgaris, Schum. Nouv. Syst. 145, pi. 13, fig. 3. 



Cyprina arctica, Bowd. El. Conch. 11, fig. 33: 



Shell large, thick, and heavy, ovate-orbicular, tumid ; beaks ele- 

 vated, pointed, turned forwards and inwards so as to come nearly 

 9 



