52 BOOK OF SPECIES. 
slightly denticulated; inner one tuberculated ; 
diam. 2. W. 36. 47. 
N.versicotor. Thick, with transverse close 
furrows, variegated with white, red, and black ; 
spire rather prominent ; aperture narrowed, almest 
grinning; both lips strongly toothed; diam. 2. 
W. 36. 54. 
N. MALACCcENSIS. Thickish, 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. 3. W. 
36. 68. ' 
N. NIGERRIMA. Ovate-globose, deep black, 
slightly striated transversely; aperture white ; 
