86 TESTACEOUS MOLLUSCA. 
delicate radiating striz, posteriorly much elongated, rounded yellow ; 
anteriorly oblique, truncated, biangulated, purple : the margin finely 
denticulated. 1..4. 
D. Putcurtta. Nobis in Z. P, 1843. Very elongated trans- 
versely, convex, very inequilateral, pellucid, polished, whitish, with 
three anterior narrow purple rays, obsoletely and radiatingly striated ; 
anterior slope rounded, finely striated longitudinally, its edge very 
convex ; ventral edge crenulated, nearly straight, sub-incurved an- 
teriorly ; lateral teeth very approximate. +..5.— VW. Indies ?— 
Very like Scalpellum. Gray. 
CAPSA. 
Transverse, equivalve, valves approximate and close ; with two 
primary teeth in the right valve, and a single bifid one in 
the left ; no lateral teeth ; ligament external. 
C. Compranata.* Sow. G.f. 8.—Teviina Pourra. Poli. 2. 
t. 21. f. 145.—Donax Comrranata. Mont. p. 106.—Turt. B. 
t. 7. f. 13, 4.—D. p. 150.—W. t. 6. f. 6. Ovate-oblong, trans- 
verse, smooth, whitish under a greenish epidermis, and marked at 
the posterior end with a single yellowish ray, bordered by two 
brown lines: margin quite entire, somewhat violet within.— Medi- 
terranean, J‘. 
C. Levieata. Lam. 1.—Donax. L. Gimel. 3265.—D. p. 
154.—Ch. f. 249.—W. t. 6. f. 14. Triangular, ovate, sub- 
equilateral, obsoletely striated, and shghtly depressed on the anterior 
slope ; epidermis greenish yellow, beaks and interior violet : mar- 
gin quite entire. 15..24.—Z'ranquebar. 
C. Brasttiensis. Lam. 2.—Son. Gf. 1.— Reeve. t. 61. f. 1. 
— Bl. t.71.f. 3.—H. t. 261. f. 10. Oblong, triangular, inequi- 
lateral and very depressed towards the anterior extremity ; epider- 
mis yellowish green, striated both longitudinally and transversely : 
whitish within.— Brazil.— Larger than the last. 
C. Rincens. Desh.—Donax Serra. D. p. 149.—W. t. 
6. f. 4.—Donax R. Lam. 16.—Ch. f. 251, 2.—E. t. 260. f. 3: 
Large, ovate-triangular, wedge-shaped, with the anterior end gib- 
bous, rough, and undulatingly wrinkled; whitish, stained with 
violet within : margin strongly toothed, cartilage cleft oblong. 2..3. 
— Cape of Good Hope. 
C. Attior. Sow. Z. P. 1832. Sub-triangularly oblong, palish 

1 A copy of Schreeter’s figure of Donax Candida (W. t. 6. f. 20.) 
is given, but the description of the hinge which is stated to have 
three cardinal and a lateral tooth in each valve, prevents the pos- 
sibility of its belonging to this genus. 
