796 TROCHUS. 



Shell about an inch long, and rather more than an inch and a 

 quarter broad, and differs from the foregoing species in hav- 

 ing the whirls more rounded and less produced, and in the 

 surface being smooth ; the lower whirls are said to be some- 

 times coated with a black crust, and in Knorr's figure the 

 upper whirls are painted dark orange. 



CRASsus. 87. Shell sub-ovate, thick, coarse, with 

 one tooth on the pillar, and thq base by the 

 inner lip white and flattened. 



Trochus crassus. Montagu Test. p. 28 1 . Maton and Rac~ 

 ket, in Lin. Trans, viii. p. 154. Dorset Cat. p. 48.' 1. 17. 

 f. 3 and 7. 



Turbo lineatus. Da Costa Brit. Conch, p. 100. t. 6. f. 7. 

 Donovan, ii. t. 71. 

 Inhabits the coasts of Great Britain. Da Costa, 8^c. 

 Shell about three-quarters of an inch, or an inch long, and 



nearly equally broad, of a greyish brown or blackish colour, 



obsoletely marked with crowded zic-zac transverse rather 



darker lines, and the inside pearly. 



TUBER. 88. Shell somewhat depressed, with the 

 whirls strongly plaited above, and nodulous 

 at their lower margins. 



Trochus Tuber. Linnaus Syst. Nat. p. 1230. Chemnitz, 



V. p. 55. t. 165. f. 1572 to 1576. Schroeter Einl. i. p. 



668. Gmelin, p. 3578. Schreibers Conch, i. p. 256. 

 La Perruche verde. Favanne, ii. p. 98. t. 9- f- C 

 Lister Conch, t. 646. f. 38. Argenville, t. 8. f. I. Seba, 



'in. t. 74. f. 12. Knorr, i. t. 3. f. 2. Geve. t. 15. f. 135 



and 136. Regenfuss, i. t. 12. f. 76. 

 Variety. Smaller, and the whirls much depressed. 

 Trochus pantherinus. Gmelin, p. 3584. 

 Trochus, No. 182. Schroeter Einl. i. p. 749- 

 La Perruche aplatie. Favanne, ii. p. 14. 

 Le Kachin. Aclanson Senegal, p. 187. t. 12. f. 9- 

 Geve. t. 15. f. 141 and 142. Regenfuss, i. t. 3. f. 27. 

 Inhabits the Mediterranean. Linnans. Coasts of Barbadoes. 



Lister. Martinique and St. Domingo. Favanne. 

 Shell an inch and a quarter, or sometimes nearly two inches 

 long, and about equally broad, and is remarkable for its 

 strong longitudinal plaits, which occupy the upper part, and 

 disappear on the middle of the whirls ; the colour is green 



