36 
C. Ecuinatom. Lin. 1122.—D. p. 116.—Lam. 12. 
—Pen. 4. p. 187.—Da Cos. t. 14. f. 2.— Don. t. 107. 
f. 1.—Mont. p. 73.—Inn. T. p. 63.—Dor. Cat. p. 
31.4. 6.f. 2.—Wood. G. C. t. 49. f. 1,2.—Turt. C. 
D. p. 29.—Turt. B. p. 183.—F. p. 421.—(Youny 
©. Cintare. Lin. &c.) Suborbicular, convex, thin, 
slightly oblique, brown or whitish, with eighteen ribs, 
armed with numerous inflected sharp white spines, 
curving towards the cartilage side, the posterior ones 
thicker and mure obtuse; the grooves only striated. 
2...2. Common on sandy shores. 
C: OxpovaLe. Sow. in C. I.—C. ELoncatum. 
Mont. p. 82.—ILin. T. 8. p. 67.— Pen. 4. p. 190.— 
Wood. G.C. p. 214.—D. p. 1381.—Turt. D. p. 31.— 
Turt. B. p. 185. t.13. f. 9.—F. p. 422.—Oval, in- 
equilateral oblique, produced and subangulated ante- 
riorly, pale rufous, with some obscure darker spots 
anteriorly, tumid in the middle, with twenty-five prickly 
ribs, the central flattened and separated by a fine line. 
4. Torbay. 
C. Noposum. Mont. p. 81.—Lin. T. 8. p. 68.— 
Pen. 4. p. 189.—Wood. G. C. p. 212.—Turt. B. p. 
186. ¢. 13. f£ 9—Orbicular and rather flat, equilateral, 
brown or whitish, very slightly angulated anteriorly, 
