TROCHUS. 783 



or pillar-lip has two jags or slight teeth, and two furrows 

 crossing it transversely : from hence it widens, runs oblique, 

 and forms a spacious cavity, at the bottom of which lies the 

 umbilicus, deep, cylindric, and so hollow as to admit the 

 head of a large pin. All this part is of a dark ash, greatly 

 variegated with blackish lines or streaks, which run length- 

 ways and across ; but the beginning of the umbilicus is ge- 

 nerally pearly, and of a fine light greenish colour." 



FAsciATUS. 58. Shell conical, smooth, with the 

 whirls rounded, and flattened at their upper 

 margins ; umbilicus deep, and the outer lip 

 crenulated. 



Trochus fasciatus. Born Mas. p. 331. t. 12. f . 2 and 3. 



Gmelin, p. 3576. Schreibers Conch, i. p. 251. 

 Trochus, No. 177. Schroeter Einl. i. p. 747. 



Inhabits 



Bom has described this shell to be five lines long and six 

 broad, with five rounded whirls, which become flattish to- 

 wards their upper margins ; umbilicus vertical and deep ; 

 colour white spotted with brown, and marked with a trans- 

 verse white band. The figure has a rounded aperture, and 

 looks a good deal like a Turbo. 



PERSPECTiviuNCULUS. 59. Shell depressed, tn 

 versely striated and slightly granulated ; i 

 bilicus pervious and crenated ; apert 



I'ans- 



um- 



aperture 



roundish. 



Trochus perspectiviunculus. Meuschen in Miis. Gronov, 

 p. 125.? Chemjiitz, v. p. 134. 1. 173. f. 1708 and 1709. 



Trochus variegatus. Gmelin, p. 3575. Schreibers Conch. 

 i. p. 247. 



Trochus, No. 98. Schroeter Einl. i. p. 718. 



Geve. t. 25. f. 275. 



Inhabits 



Shell about seven lines broad, and much depressed, with the 



umbilicus large, and crenated like that of T.persjpectivus; 



it is white, with brown longitudinal broadish rays. 



iNFUNDiBULiFORMis. 60. Shell depressed ; whirls 

 rounded, transversely striated and crenulated 

 with granules; umbilicus very wide, sinu- 

 ated, and minutely crenulated. 



