TROCHUS. 769 



but the figure is pale green, and the description and figure 

 do not in other respects well accord ; the base is marked 

 with concentrical striae, and the umbilicus, which is funnel- 

 shaped, is said not to follow the direction of the whirls. 



AGRESTis. 21. Shell sub-pyramidal, obtuse, smooth, 

 of a blackish brown colour, and the inside 

 pearly ; pillar with one obsolete tooth. 



Trochus agrestis. Chemnitz, v. p. 97. 1. 170. f. 1645 and 



1646. 

 Trochus ruslicus. Gmelin, p. 3572. Schreibers Conch, i. 



p. 254. 

 Trochus, No. 66. Schroeter Einl. i. p. 705. 



Inhabits the coasts of China. Chemnitz. 



Shell about an inch and a quarter long, and an inch broad, 

 coarse, unornamented, and of a blackish brown colour, ex- 

 cept the base which is pale brown ; the whirls are slightly 

 ventricose, and obliquely wrinkled. 



NIGER. 22. Shell turban-shaped, plaited, black, 

 and the inside pearly ; pillar with an obso- 

 lete tooth. 



Trochus niger. Chemnitz, v. p. 98. 1. 170. f. 1647. 

 Trochus nigerrimus. Gmelin, p. 3573. 

 Trochus, No. 67. Schroeter Einl. i. p. 705. 



Inhabits the coasts of China. Chemnitz, 



This shell, by Chemnitz's figure, appears to be three-quarters of 

 an inch long, and about equally broad, consisting of five uni- 

 formly black whirls, and longitudinally ribbed or plaited ; 

 it somewhat resembles T. argyrostomus, but that species is 

 not umbilicated. 



FANULUM. 23. Shell pyramidal, with oblique plaits 

 interrupted by a granulated transverse band 

 at the sutures. 



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



i. p. 255. 

 Trochus, No. 68. Schroeter Einl. i. p. 706. 

 Le Boutonnier. Favanne, ii. p. 348. 1. 13. f. O. 

 Sacellum Chinense. Chemnitz, v. p. 98. t. 170. f. 1648 



and 1649. 

 Bonanni Rec. 3. f. 396, and Kirch, f. 372. Petiver Gaz, 



t. 156. f. 15. Geve. t. 15. f. 138 aud 139- 



