NANTNA. 21 



N. NASUTA, Metcalfe. PL 3, fig. 42. 



Subimperforate, very thin, obliquely striated, with light, very 

 small concentric lines, waxy pellucid, very light greenish cor- 

 neous ; whorls 5^, suture ridge-margined, last whorl not descend- 

 ing in front, acutely carinated. Diam. 36 mill. 



Borneo. 



Unfigured Species. 



N. TAIVANICA, Mollend. Formosa. 



N. LINDSTEDTI, Pfr. Malacca. 



N. SARAWAKANA, Dohrn. Borneo. 



Subgenus C(ELATURA, Pfr., 1877. 



N. CCELATURA, Fer. PI. 3, fig. 43. 



Imperforate, rather solid, the incremental strise distinct, 

 crossed by irregular distant revolving lines ; whorls 4 or 5, dark 

 brown ; lip somewhat thickened. Diam. 28 mill. 



Ins. Bourbon. 



The synonymy includes -N. exarata, Wiegm, and N. rufina, 

 Jay. 



N. DUPONTT, Morelet. PL 3, figs. 44, 45. 



Imperforate, solid, with crowded oblique striae, and distant 

 spiral sulci ; reddish brown ; whorls 5, the last deflected in 

 front; lip thickened, its extremities connected by a parietal 

 callus. Diam. 40 mill. 



Mauritius (subfossil). 



N. sulcifera, Barclay (fig. 45), is considered a synonym. 



N. BEWSHERIANA, Morelet. PL 3, fig. 46. 



Imperforate, arcuately costate-striate ; whorls 5^, the last ob- 

 tusely angulated on the peripher}', angle evanescent towards 

 the aperture ; peristome angularly incurved above ; bleached 

 white. Diam. 33, alt. 19 mill. Ins. Rodriguez. 



Subfossil. 



N. SIMPLEX, Lam. PL 3, fig. 47. 



Imperforate, obliquely striate, light reddish brown, with 

 darker fasciations, apex reddish. Diam. 40 mill. 



Amboina. 



A doubtful member of the group. 



