Cytherea. mollusc a. VENERID^E. 445 
Venus Ch. Linn. Test. i. 1131. Dm. Brit. Shells, t. xvii. Mont. 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. Mmt. Test. Brit. 
Sup. 48.— C. Guin. Turt. Biv. Brit. 161. — At Weymouth, Mr Bryer^ 
and at Dunbar, Mr Lashey. 
Length an inch and a quarter, breadth one inch and a half ; white, with 
purple rays ; the heart-shaped lunule and cartilage depression purple ; slight- 
ly truncated retrally. 
515. C. exoleta. — Shell suborbieular, nearly equilateral, dis- 
tinctly striated transversely. 
Pectunculus dense fasciatus, List. Conch, t. ccxci. — Venus exoleta, Linn. 
Syst. i. 1134. Penn. Brit. Zool. iv. 94. t. lix. f. 49. Dm. Brit. 
Shells, t. 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 ; brownish 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. Zool. iv. 95. t. Ivi. f. 49.— V. lincta, Pult. Dorset. 34. 
V. exol. Matm and Rackett, Linn. Trans, viii. 87, t, iii, f. 2. — C. sinua- 
ta, Tiirt. Biv. Brit. 163. t. x. f. 10. — Sandy bays in deep water. 
Length an inch and a half, breadth about one-tenth less ; glossy 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 
all, by the stri« 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. Mmt Test. Brit. 119. t. iv. f. i.— 
C. tigerina, Turt. Biv. Brit. 164. t. X. £ 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 ; brownish white ; towards the mid- 
dle the ribs have intermediate striae ; an obscure cordiform depression, raised 
in the middle before the beaks. 
