28 NANTNA. 



N. IMPERFECTA, Desh. PI. 5', figs. 81, 82. 



Imperforate, thin, pellucid, light brown ; whorls 5, the first 

 two smooth, mamillate, the rest flattened, suture margined, 

 minutely transversely striate, the last carinate. 



Diam. 11, alt. 7 mill. 



Isl. Bourbon, Mauritius. 

 N. CERNICA, H. Adams. PL 5, fig. 83. 



Imperforate, very thin, membranaceous, obliquely longitudi- 

 nally striate, minutely decussated by spiral lines, yellowish 

 horn-color; whorls 4, apex obtuse, suture lightly impressed; 

 last whorl acutely carinated, descending in front. 



Diam. 10, alt. 8 mill. Mauritius. 



N. BORYANA, Morelet. (Unfigured.) Mauritius. 



Subgenus RHYSOTA, Albers, 1850. 

 N. VIRENS, Martens. PL 7, fig. 14. 



Perforate, obliquely striate, the last whorl with impressed not 

 crowded spiral lines, and rare oblique rugre, shining, green, with 

 a narrow obscure chestnut band at the periphery, spire convex, 

 reddish brown, suture crenulate-striate ; whorls 5, the last not 



deflexed. Diam. 43, alt. 29 mill. 



Sumatra. 



This may be N. tumens, Desh., a shell originally referred by 

 Pfeiffer and others to the synonymy of N. cidaris, Lam. 



N. LIMBIFERA, Martens. PL 7, figs. 15, 16. 



Perforate, rather solid, striulate, with elevated, not crowded 

 undulating spiral lines and short oblique, distant, slight ruga' ; 

 somewhat shining, yellowish or chestnut color, with a moderate 

 peripheral band, and lighter border below it, umbilical region 

 chestnut; whorls -5^, suture submarined. 



Diam. 36-43, alt. 25-83 mill. 



Celebes. 



N. ERRATICA, Hende. PL 7, fig. 21. 



Perforate, rather thick, concentrically and spirally striate, yel- 

 lowish chestnut, two-banded ; columella arcuate, half covering 

 the umbilicus ; outer lip sharp. Diam. 41, alt. 27 mill. 



Province of Hne-bei, China. 



