Cytherea. MOLLUSCA. VENERID.E. 445 



Venus Ch. Linn. Test. i. 1131, Don. Brit. Shells, t. xvii. Mo7U. Test 



Brit. 115— C. Ch. Turt. Biv. Brit. 161. t. viii. f. 11 Southern coasts 



of England ; where the shells are called Queens. 



Length about 3 inches, breadth 4 ; cuticle chesnut, with darker bands ; 

 beaks incurved, little elevated and inclined ; edge obtuse. 



514. C. Guineensis. — Subcordate, with numerous close re- 

 gular sharp ridges. 



Pectunculus ruber, List. Conch, t. 306 — Venus Guin. Mont. Test. Brit. 

 Sup. 48 — C. Gum. Turt. Biv. Brit. 161.— At Weymouth, Mr Bryer, 

 and at Dunbar, Mr Laskey. 

 Length an inch and a quarter, breadth one inch and a half; white, with 

 ]Hirple rays ; the heart-shaped lunule and cartilage depression purple ; slight- 

 ly truncated retraUy. 



515. C. exoleta. — -Shell suborbicular, nearly equilateral, dis- 

 tinctly striated transversely. 



Pectunculus dense fasciatus, List. Conch, t. ccxci — Venus exoleta, Linn. 

 Svst. i. 1134. Penn. Brit. Zool. iv. 94. t. lix. f. 49. Brni. Brit. 



Shells, I. xlii. f. 1. Mont. Test. Brit. 116 C. ex. Turt. Biv. Brit. 



162. t. viii. f. 7- — Sandy bays, in deep water. 

 Diameter about two inches ; brownisli white with dark zig-zag stripes ; 

 compressed ; the ridges are sharp on the umbonal edge, and broader than the 

 intervening striae ; syphon margin slightly truncated. 



516. C. lincta. — Suborbicular, oblique, inequilateral, with 

 fine concentric striae. 



Pectunculus, rostro productiore, List. Conch, t. ccxc Venus exoleta, 



var. Penn. Brit. Znol. iv. 95. t. Ivi. f. 49. —V, lincta, Pult. Dorset. 34. 



V. exol. Maton and Rackett, Linn. Trans, viii. 87, t. iii. f. 2. — C. sinua- 



ta, Turt. Biv. Brit. 163. t. x. f. 10. — Sandy bays in deep water. 



Length an inch and a half, breadth about one-tenth less; gloss}' white. 



It is chiefly distinguished from the preceding by the greater prominence of 



the beaks, by the cartilage slope being longer and less rounded ; and, above 



aU, by the striae being more numerous, and the intervening ridges flatter on 



the corresponding parts. By Montagu it was considered as the young of C. 



exoleta. 



517. C. tigerina. — Suborbicular, compressed, with numer- 

 ous longitudinal striae crossed by finer lines of growth. 



Pectunculus magnus, List. Conch, t. cccxxxvii Venus tigerina, Linn. 



Syst. i. 1133. Pult. Dorset. 24. Mont. Test. Brit. 119. t. iv, f. i 



C. tigerina, Turt. Biv. Brit. 164. t. x. f. 12 English shores. 



Diameter about an inch ; white, with a crimson tinge ; dorsal edge slightly 

 depressed, with the beaks small and prominent, the ventral edge rounded. 



518. C. ovata. — Subtriangular, with longitudinal ribs, ren- 

 dered scaly by transverse striae ; no impression at the cartilage, 



Pectunculus parvus. List. Conch, t. cccxi Venus ovata, Penn. Brit. 



Zool. iv. 97- t. Ivi. f. 56 — Cardium striatum. Walk. Test. Min. 23. 



t. iii. f 82 — V. ovata, Mont. Test. Brit. 120. Turt. Biv. Brit. 150 



On various parts of the coast from Devon to Zetland. 

 Length |ths, breadth |ths of an inch ; brownisli white ; towards the mid- 

 dle the ribs have intermediate striie ; an obscure cordiforni depression, raised 

 in the middle before the beaks. 



