TROCHUS. 775 



Trochus Capensis. Gmelin, p. 3573. Schreibers Conch, 



i. p. 244. 

 Trochus, No. 74. Schroeter Einl. i. p. 708. 



Inhabits the sea at the Cape of Good Hope. Chemnitz. 



The description given by Chemnitz is very imperfect, but the 

 shell appears by the figures to be about five lines long, and 

 seven broad ; the colour is white mottled with red, and the 

 lower margin of the whirls spotted with dark chestnut. 



AFER. .36. Shell convex, depressed, and the whirls 

 transversely grooved. 



Trochus afer, Gmelin, p. 3577. 



Trochus griseus. Gmelin, p. 3576. 



Trochus, No. 180. Schroeter Einl. \. p. 748. 



Le Lonier. Jdanson Senegal, p. 184. t. 12. f. 6. 



Inhabits the coasts about Cape Dakar in Senegal. Adanson. 



Adanson describes this species to be about half an inch long, 

 and says that the spire is much more elevated in some shells 

 than in others, and that in the more depressed the breadth 

 is almost double the length ; it has twelve transverse grooves 

 on the first whirl, six on the second, and four on the third ; 

 the colour is grey or brown, marbled with white spots. 



MODULUS. 37. Shell depressed, transversely striat- 

 ed, and plaited longitudinally; body-whirl 

 transversely carinated ; base convex, and the 

 pillar one-toothed. 



Trochus Modulus. Linncsus Syst. Nat. p. 1228. Chem- 

 nitz, V. p. 105. t. 171. f. 1665. Schroeter Einl. i. p. 

 656. t. 3. f. 11. Gmelin, p. 3568. Schreibers Conch. 

 i. p. 242. 

 Le Grenat. Favanne, ii. p. 150. t. 8. f. D. 

 Lister Conch, t. 653. f. 52. 

 Inhabits the coasts of Barbadoes. Lister. Red Sea. Schroe- 

 ter. Isle of France, and the West Indies. Favunne. 

 Shell about five lines long and six bread, with dotted chestnut 

 striae ; the throat as well as the base is grooved, and the aper- 

 ture ovate. 



DECLivis. 38. Shell sub-ovate, and transversely 

 striated ; whirls shelving, longitudinally plait- 

 ed, and tuberculated on the margin ; base 

 convex, and the pillar one-toothed, 

 o 2 



