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The columellar plication is obsolete or represented by a slight 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. PI. 6, fig. 7. 



Im perforate,, finely wrinkled-striate, chestnut-brown, with a 

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

 margined, with a long obliquely spiral columellar plication. 



Diam. 13, alt 8 mill. 



Mauritius. 



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

 Benson. 



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



Narrowly perforate, striate ; whorls 4 J, 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, Barclay. (Unfigured.) Mauritius. 



Section ALDWELLIA, 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, acutety keeled ; lip acute. 



Diam. 17, alt. 9 mill. 



Mauritius. 

 N. mucronata, Pfr., is a synonym. 



