64 NERITINA. 



N. undata, Lesson, and var. inermis, Martens (fig. 7), are syno- 

 nyms, the latter for specimens in which the spines are broken or 

 not well developed ; but I have never seen a specimen without some 

 indication of their presence. 



N. SOULEYETANA, Recluz. PL 23, figs. 8, 9. 



Rather smooth, shining, black, with white or yellowish, more or 

 less interrupted and undulated longitudinal strigations, shoulder 

 subangulated, with distant rather short, somewhat stout spines, 

 aperture yellowish or bluish white, columellar margin incurved and 

 very faintly minutely dentate in the middle. Diam. 13-20 mill. 



Marquisas Is., New Ireland, Moluccas, etc. 



Small specimens entirely devoid of spines are of frequent occur- 

 ance. N. Recluziana, Guillou (fig. 10), N. hapa, Hombr. et Jacq., 

 and N. rarispina, of the same authors, N. nigrispinis. Lesson, and 

 var. Studeriana, Martens are synonyms. 



Var. KERAUDRENII, Le Guillou. 



The strigations replaced by numerous small rounded or subtri- 

 angular yellowish or whitish spots. 



N. Armstrongiana, Hinds is a synonym. 



N. MADECASSINA, Morelet. PI. 23, fig. 11. 



Slightly striate, somewhat plicately folded, yellowish or olivaceous, 

 more or less variegated in spots or bands, or uniformly reddish 

 brown, with a more or less defined shoulder, sometimes unarmed 

 but usually cord-like with an occasional short spine; aperture 

 bluish white or yellowish white, slightly sinuous on the middle of 

 the columellar margin which is minutely dentate throughout. 



Diam. 15-21 mill. 



Madagascar. 



It is N. corona Bengalensis, Chemn., but does not inhabit the 

 neighborhood of Bengal. 



N, DIADEMA, Recluz. PL 23, figs, 12-15. 



Lightly striulate, smooth, shining, yellowish olivaceous, occasion- 

 ally pale violaceous, with white, black-bordered subtriangular 

 spots, shouldered, with usually moderately long spines, sometimes 

 scarcely developed; aperture whitish or bluish white, columellar 

 edge minutely dentate. Diam. 12-16 mill. 



East Indies, Philippines. 



N. aranea and N. cryptospina, Mousson are synonyms. 



