NKRITA. 23 



N. NiGERRiMA, Cliemii. PI. 8, figs. 42, 43. 



Shell thick, spirally grooved, groov^es often becoming obsolete 

 towards the aperture, black, polished ; aperture whitish or yellowish 

 white, the outer lip finely denticulated within, columellar margin 

 toothed in the middle, area obscurely wrinkled above, granular 

 below. Diam. 1'25 inch. 



Australia, Polynesia. 



This is iV. nigerrima, Chemn., as unfolded by Reeve and others ; 

 the original figures are not readily determinable. N. achatina, 

 Reeve (fig. 43), is a probable synonym. 



N. MACULATA, Pease. PL 4, fig. 61. 



Minutely spirally ribbed, separated by engraved lines, polished, 

 black, minutely, numerously flecked with yellowish grey ; aperture 

 white, lip numerously toothed within, columellar margin with two 

 small median teeth and a larger quadrangular one above them, area 

 concave, tuberculated. Diam. 15-18 mill. 



Central Polynesia. 



It is N. Schmeltziana, Dunker. 



N. ARCiUS, Recluz. PI. 4, fig. 59. 



Shell smooth, indistinctly, closely spirally striate, olive brown or 

 blackish, shagreened with minute white flecks, often apj^arent only 

 on close inspection ; aperture yellowish white, outer lip with numer- 

 ous small plicate denticles, larger at the extremities of the series, 

 columellar margin with four minute teeth, area flattened, with a 

 few granules. Diam. 1 inch. 



Philippines, Hong Kong, China. 



The species was described as from Rio Janeiro, but has never 

 been authoritatively illustrated ; for convenience, Reeve's identifica- 

 tion of it with a rather common oriental species, is followed. 



N. FuLGURANs, Gmelin. PL 4, figs. 62, 63, 66-69 , PL 9, fig. 63. 



Shell with numerous, narrow, distinct rounded ribs, separated by 

 incised lines, minutely scabrous from the crossing of close growth- 

 strise, black, unicolored or maculated with yellowish grey; aperture 

 white, lip with two stronger teeth above and below, and numerous 

 intermediate plicate denticles, columellar margin with two minute 

 median teeth and a larger quadrate one above them, area flattened, 

 granular. Diam. ■75-l"25 inch. 



West Indies, Brazil, Panama to Gulf of California. 



