2Q0 



the fize of a cherry, fhape obtufely pyramidal, or not 

 quite tapering to a point. 



The bafe is very concave, with fome circular furrows; 

 the mouth roundifli and capacious, within fine mother of 

 pearl; the outer lip fmooth and even: the inner, or pil- 

 lar lip, has two jags or flight teeth, and two furrows crofs- 

 ing it tranfverfely : from hence it widens, runs oblique, 

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

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

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

 variegated with blackifii lines or ftreaks, which run length- 

 ways and acrofs : but the beginning of the vmbilicus h 

 generally pearly, and of a fine light grernifii colour. The 

 body and turban have five bellied, or fwelled, wreaths or 

 whirls, feparated by a very depreffed line ; they are circu- 

 larly ftriated, but faintly, and the colours are exaftly the 

 fame as on the bafe. 



The outer coat being taken off, the whole fiiell is fine 

 mother of pearl. 



Da Costa has qaoted Wallace, Lister's Concho- 

 logy, Dale, and Wallis, but we can find nothing that 

 throws more light upon the fubjeft. 



The ftrufture of the aperture certainly indicates a dif- 

 tinft fpecies, as none of the RritiJJi Trochi poffefs any 

 thing like two teeth, as a permanent charafter; at the 



fame 



