52 BOOK OF SPECIES. 



slightly denticulated ; inner one tuberculated ; 

 diam. |. W. 36. 47. 



N. VERSICOLOR. Thick^ with transverse close 

 furrows, variegated with white, red, and black ; 

 spire rather prominent ; aperture narrowed, almost 

 grinning; both lips strongly toothed; diam. f. 

 W. 36. 54. 



N. MALACCENsis. Thickisli, with transverse 

 elevated black distant ribs, dirty white, alter- 

 nating with black markings between the ribs ; 

 spire retuse, but sometimes slightly prominent; 

 inner lip concave centrally, and denticulated, 

 covered with raised dots ; outer lip with a tooth 

 or two at its top, and deeply furrowed ; its margin 

 crenulated ; diam. 1. 



N. TESSELLATA. Solid, transversely furrowed, 

 ash-colour ; furrows crowded, convex, and tessel- 

 lated with black and white ; spire rather promi- 

 nent; and the lips usually denticulated with a 

 few raised dots on the inner one; diam. |. W. 

 36. 68. 



N. NiGERRiMA. Ovate-globosc, deep black, 

 slightly striated transversely ; aperture white ; 



