TROCHUS. 809 



Chemnitz, v. 1. 166. f. 1600. 



Variety C. Greyish white, and the markings obsolete. 

 Lin. Trans, viii. t. 4. f. 14. 



Inhabits the coasts of Jamaica and Barbadoes. Lister. Vir- 

 ginia. Favanne. The Var, C has been found on the coasts 

 of Britain by Lady Wilson. Maton and Racket. 



The Variety A is about three-quarters of an inch, the Variety 

 B half an inch, and the Variety C only a quarter of an inch 

 long, and the breadth is about half the length ; in the Variety 

 A, the body-whirl is transversely carinated towards the base, 

 and also somewhat so towards the upper margin, but the 

 latter is less obvious in the other Varieties. Mr. Montagu 

 considered a minute shell which 1 found in Bantry Bay to 

 be another Variety, but it appears to me to be distinct and 

 nondescript. The Varieties A and B have been arranged 

 as separate species both by Schroeter and Schreibers. 



OBTUSUS. 115. Shell slightly conical, with the spire 

 flattened, and the whirls marginated ; base 

 convex, with the aperture roundish, and the 

 throat lead-coloured. 



Trochus obtusus. Chemnitz, xi. p. 167. t. 196. f. 1894 

 and 1895. 



Inhabits the East Indian Seas. Chemnitz. 



Shell about nine lines long, and ten broad, with the spire re- 

 markably flattened, and something like that of a Nerite ; it 

 is prettily coloured with alternate longitudinal undulated pur- 

 ple and white stripes. 



CROCATUS. 116. Shell sub-conical, smooth, with 

 convex whirls which are spinous above, and 

 the sutures grooved ; base convex. 



Trochus crocatus. Born Mus. p. 338. t. 12. f. 11 and 12. 



Gmelin, p. 3584. 

 Trochus, No. 90. Schroeter Einl. i. p. 713. 



Inhabits 



Born has described this shell to be seven lines long, and seven 

 broad, with the base and epidermis white and shining, but 

 he says that the spire, when stripped of the epidermis, is 

 saffron-coloured ; his figure, however, does not answer the 

 description, but is ten or eleven lines long, with the base and 

 body-whirl white, and the spire crimson ; nor is there any 

 appearance of spines, and it has much the appearance of a 

 Helix. 



