812 TROCHUS. 



Linnasus has described this shell to be small, of a horn-colour, 

 and the whirls C3'lindrical, with a double row of excavated 

 dots, besides which the margins also have crenated punc- 

 tures ; aperture four-sided, and the pillar prominent at the 

 base, but not so as to form a canal. Bruguiere has conjec- 

 tured that T. ventricosus may be this species. 



PUSILLUS. 122. Shell tiirreted, minute, and the 

 whirls reversed, with transverse obliquely de- 

 cussated strise ; base flat, and the aperture 

 compressed. 



Trochus pusillus. Gmelin, p. 3586. 



Trochus perversus, Var. ? Chemnitz, ix. part I. p. 126. t. 

 113. f. 9fi6. 



Trochus, No. J 85. Schroeter EhiL i. p. 751. 



Spengler n. Schrift. der Daen. i. p. 375. t. 1. f. 1. 

 Inhabits the sand on the East Indian Shores. Spengler. 

 Shell hardly a quarter of an inch long, and about one third as 



broad, of a reddish brown colour with darker spots. 



UNDULATUS. 123. Shell turreted, minute, and the 

 whirls reversed, with longitudinal ribs, and 

 transverse undulated striae ; base flat, and the 

 aperture semi-lunar. 



Trochus undulatus. Gmelin, p. 3586. 



Trochus, No. 186. Schroeter Einli i. p. 752. 



Spengler n. Schrift. der Daen. i. p. 376. t. 1. f. 2. Chem- 

 nitz, ix. part l'. p. 126. 1. 1 13. f. 967- 

 Inhabits the sands on the East Indian Shores. Spengler. 

 This shell is said to be rather smaller than T. pusillus, and the 



figure is painted nearly of the same colour. 



VENTRicosus. 124. Shell tub-turreted, minute, can- 

 cellated, with the whirls reversed, and the 

 lower ones ventricose ; base glabrous, and 

 the aperture sub-ovate. 



Trochus ventricosus. Gmelin, p. 3586. 



Trochus, No. 187- Schroeter Einl. i. p. 752. 



Cerithium perversus. ? Bruguiere Enc. Meth. p. 496. 



Spengler n. Schrift. der Daen. i. p. 376. 1. 1 . f. 3. Chem- 

 nitz, ix. part 1. p. 127. t. 113. f. 968. 

 Inhabits the sands on the East Indian shores. Spengler. 

 Shell about two lines long, and two fifths as broad, with the 



