No. 



57 C. enode, Soiv. jun. Zool. Proc. 1810. Con. Illus. f. 51. 



Shell more spread, less ventricusc, with ribs flatter 

 and closer than in C. elongatum. 



58 C. rugosum, Lam. Anim. sans vert, t. 6, p. 10. C. 



magnum, Chemn. Conch, t. 19, f. 191. Yellow 

 var. C. flavum. Linn? Con. Illus. (C. subrugosum) 

 f. 32. Dark spotted. Con. Illus. f. 39. Pink 

 spotted, Con. Illus. f. 41. Ceylon, Java. 



59 C. subrugosum. Sow. jun. Zool. Proc. 1840. Con. Illus. 



f. 34, 71. Dr. Sibbald. Ribs less elevated, shell 

 less spread, anterior side smoother than the last. 



60 C. alternatum, Soic. jun. Zool. Proc. 1840. Con. Illus. 



f. 64. Ticao, Philippines. On the Coral Reefs. Mr. 

 Cuming. 



61 C. procerum, Sow. Zool. Proc. 1833. p. 83. Con. Illus. 



f. 23 Real Llejos, Central America. Mr. Cuming. 



62 C. Panamense. Sow. Zool. Proc. 1833. p. 85. Con. Illus. 



f. 21. Panama. Mr. Cuming. Ribs fewer and more 

 angulated than in C. procerum. 



63 C. ventricosum, Brug. Diet. 25. C, magnum. Born. 



E. M. pi. 299. f. 1. Carolina. 



64 C. sulcatum. Lam. Anim. sans vert. torn. 6. p. 10. C. 



oblongum, Chemn. Conch, t. 19. f. 90. C. flavum, 

 Born. Mediterranean. A shell has been collected 

 at Plymouth by Mr. Cuming, Avhich is distinct 

 from C. serratum, and may probably turn out to 

 be a British variety of this species. 

 60 C. datum. Sow. Zool. Proc. 1833. p. 84. Con. Illus. 

 f . 3. California. 



66 C. serratum, Linn. Syst. Nat. 1123. E. M. 299. f. 2. C. 



hfivigatum. Wood. pi. 54, f. 1. Britain. 



67 C. Groenlandicum, Gmel. P. 3252. Chemn. Conch, t. 19, 



f. 148. var. edcntula. Soiv. gen. of Sh. Greenland. 



68 C. biradiatum, Brit/j. Diet. 28. Chemn. Conch, t. 18, 



f. 185, 186. Ceylon. 



