TROCHUS. 785 



half as long, and beautifully variegated and spotted in trans- 

 verse rows ; the base is flat, and the umbilicus large, and 

 elegantly crenuiated throughout; it is generally known by 

 the name of the Staircase, but Petiver has called it the 

 Spinnet Shell. 



STRAMINEUS. Q^. Shell depressed ; whirls round- 

 ed, with a distinct groove, and decussated 

 striae ; umbilicus pervious, and slightly cre- 

 nuiated. 



Trochus stramineus. Gmelin, p. 3575. 



Trochus perspectivus stramineus. Chemnitz, v. p. 128. 

 t. 172. f. 1699. 



Trochus perspectivus, Var. Schreibers Conch, i. p. 241. 



Trochus, No. 90. Schroeter Einl. i. p. 7 17. 



Le Cadran Americain. Favanne, ii. p. 426. ? 



Lister Conch, t. 635. f. 23, 

 Inhabits the coasts of Tranquebar. Chemnitz. 

 Shell about ten or eleven lines broad, and but little elevated, 



with five or six whirls of a straw colour. 



iNDlcus. 64. Shell depressed, slightly convex, 

 with minute oblique striae, and the base con- 

 cave; umbilicus deep, sinuated, and slightly 

 striated. 



Trochus Indicus. Gmelin, p. 3575. 



Trochus Solaris Indize Orientalis. Chemnitz, v. p. 127. 



1. 172. f. 1697 and 1698. 

 Trochus, No. 95. Schroeter Einl. i. p. 717- 



Inhabits the East Indian Seas. Chemnitz. 



Shell two inches and a quarter broad, and hardly an inch high, 

 consisting of fine whirls of a snow-white colour, and some- 

 what hyaline ; the base is concave, and marked with lines 

 radiating from the umbilicus. 



PLANUS. 65. Shell depressed, with the whirls lon- 

 gitudinally plaited, and the umbilicus per- 

 vious. 

 Trochus planus. Gmelin, p. 3576. Schreibers Conch i. 



p. 248. 

 Trochus Solaris complanatus. Chemnitz^ v. p. 143. t. J 74. 

 f. 1721 and 1722. 

 . . Trochus, No. 102. Schroeter Einl. i. p. 721. 



