NANINA. 27 



the reflected lip and slightly twisted columella and interior of 



aperture white. Diam. 2'7, alt. 2-4 inches. 



Seychelles Is. 



The columellar plication is obsolete or represented by a slight 

 bulge and twist of the thickened columella. 



N. STYLODON, Pfr. PL 6, fig. 7. 



Imperforate, finely wrinkled-striate, chestnut-brown, with a 

 narrow, darker peripheral band ; whorls 5J ; aperture sharp 

 margined, with a long obliquely spiral columellar plication. 



Diam. 13, alt 8 mill. 



Mauritius. 



It is N. depressa, Fer. ; N. monodonta, Grat. ; N. albidens, 

 Benson. 



X. SCALPRUM, Val. PL 6, fig. 8. 



Narrowly perforate, striate ; whorls 4^, the last strongly keeled ; 

 columella with a small, distinct plication. Diam. 15, alt. 7'5 mill. 



Habitat unknown. 

 N. ODONTINA, Morelet. PL 6, figs. 5, 6. 



Narrowly umbilicated, whorls 6, rounded ; light horn-color, or 

 whitish, umbilicus with an oblique tooth. Diam. 8, alt. 6 mill. 



Mauritius. 



It is N. Lightfooti, Pfr. (fig. 6), erroneously assigned to 

 Australia, and N. suffulta, Benson (fig. 5). 



N. CALDWELLI, Barcla}^ (Unfigured.) Mauritius. 



Section CALDWELLI A, H. Adams, 1873. 



N. PHILYRINA, Morelet. PL 4, fig. 74. 



Imperforate. very thin, membranaceous, obliquely rugulose, 

 with very close, slight spiral lines, pellucid, greenish corneous ; 

 whorls 4, rapidly increasing, apex mucronate. suture impressed, 

 last whorl not descending, acutely keeled ; lip acute. 



Diam. 17, alt. 9 mill. 



Mauritius. 

 N. mucronata, Pfr., is a synonym. 



