304 GINGLYMACONCHA. VENERID. 
Trans. Linn. Soc. viii. 81; Flem. Edinb. Encycl. vii. 81; 
Dill. Desc. Cat. 166; Turt. Conch. Dict. 236. 
This very rare species has’ hitherto only been found in the 
deep sea off Falmouth. 
Genus 46. Cyprina, Lamarck. 
The shells obliquely cordate, equilateral; the umbones ob- 
liquely curved: the hinge with three unequal teeth approxi- 
mating towards their bases and divaricating above ; the lateral 
lamellee placed far from the hinge, and in the left side is some- 
times obsolete ; the cardinal ligament is more or less immersed 
under the umbones. 
The animal is unknown to me. 
1. Cyprina ISLANDICA. 
Shells thick obliquely, shortly cordate, anteriorly slightly 
angulated ; the epidermis pale fuscous or yellowish-brown, con- 
centrically striated. Length four inches ; height three inches 
and a half. 
Venus Islandica, Lister, Anim. Angl. t. iv. f. 22; Conch. 
t. cclxxu. f. 108; Linn. Syst. Nat. 1131. no. 24; Chem. 
Conch. vi. t. xxxil. f. 341 ; Gmel. Syst. Nat. 3271; Pult. 
Cat. Dorset. 33. t. vi. f. 5; Donov. Brit. Shells, t. \xxvii. ; 
Mont. Test. Brit. 114; M. & R. Trans. Linn. Soc. vui. 
83; Flem. Edinb. Encycl. vu. 94; Dill. Desc. Cat. 176 ; 
Lam. Hist. Nat. des Anim. sans Vert. v. 556; Turt. Conch. 
Dict. 238. 
Venus mercenaria, Penn. Brit. Zool. iv. 94. t. lin. f. 47. 
Pecten crassus, Da Costa, Brit. Shells, 183. t. xiv. f. 5. 
Cyclas Islandica, Brug. Encycl. Méthod. t. ecci. f. 1, a, 6. 
Inhabits the deep sandy coasts of the European seas ; is ex- 
tremely common, but very rarely taken alive. I have, as well 
as Mr. J. Cranch, been out for many days in the Plymouth 
Sound and the coast of Cornwall in the trawl vessels, and al- 
though we have procured them abundantly, we never could 
meet with any having the animal. 
