TROCHUS. 795 



Inhabits the Adriatic. Bonanni. Mediterranean and coasts of 

 the Canary Islands. Lister. Isle of France. Favanne. 



Shell about eleven lines long and nine broad, and may be dis- 

 tinguished from T. tessellatus by its being destitute of either 

 transverse ribs or nodules ; the colour is reddish or brownish 

 white, tessellated with darker transverse rows of spots, or 

 longitudinal undulated irregular stripes. 



ARGYROSTOMUS. 85. Shell ovate, black, with ob 

 lique somewhat undulated plaits, and the in- 

 side silvery ; pillar one-toothed. 



Trochus argyrostomus. Gmelin, p. 3583. Schreibers 



Couch, i. p. 265. 

 Trochus Atramentarium. Cal/ones Cat. p. 26, No. 46l. 

 Trochus Diadema. Meuschen Mus. Gevers. p. 282, No. 



395. 

 Trochus, No, 25. Schroeter Einl. i. p. 689. 

 Trochus imperforatus niger argyrostomus. Chemnitz, v. p. 



51. t. 165. f. 1562 and 1563. 

 L'Ecritoire. Favanne, ii. p. 304. 

 D'Avila, t. 5. f. K. 

 Inhabits the coasts of New Zealand. Favanne. Arabia Felix. 



Humphreys. 

 This shell is sometimes two inches long, and about equally 

 broad, but my specimen is not much more than half so large. 

 May not T. agrestris or T. niger be only this species in an 

 earlier stage of growth, for it has been ascertained that the 

 young shells of T. crassus are slightly umbilicated ? 



MERULA. 86. Shell ovate, obtuse, turban-shaped, 

 black, with the summit and throat silvery, 

 and the base reddish. 



Trochus Merula. Chemnitz, v. p. 52. t. 165. f. 1564 and 

 1565. 



Trochus Sinensis. Gmelin, p. 3583. Schreibers Conch. 

 i. p. 265. 



Trochus, No. 26. Schroeter Einl. i. p. 690. 



Le Merle. Favanne, ii. p. 112. t. 9. f. B 1. 



Knorr, v. t. 3. f. 1. 

 Variety. With distant scattered white dots. 



Trochus tigrinus. Chemnitz, v. p. 53. t. l65. f. 1566. 



Trochus, No. 27. Schroeter Einl. i. p. 690 

 Inhabits the coasts of China. Chemnitz. Otaheite. Favanne, 



