30 NANTNA. 



brown ; whorls 4^, rapidly increasing, the last obliquely de- 

 pressed, dilated in front; aperture oblique, lip white, inflexed 

 and thickened in old specimens, the extremities connected by a 

 parietal callus. Diam. 52, alt. 25 mill. 



Caroline Islands. 



The synonyms are N. Hogoleuensis , Le Guill., and N. pachis- 

 toma, Hombr. et Jacq. 



N. DISTINCT A, Pfr. PI. 8, fig. 26. 



Umbilicated, rather thin, with growth-lines, and lightly im- 

 pressed spiral striae, slightly vernacularly rugose above, less 

 distinctly so below ; varying from light yellowish brown to 

 salmon-brown, the darker colored specimens with a light band 

 on the scarcely angulated periphery ; whorls 5 J, lip thin. 



Diam. 56, alt. 32 mill. 



Cochin China , Siam. 

 N. OVUM, Yal. PL 8, fig. 29. 



Imperforate when adult, solid, obliquely striate, sparsely 

 spirally lineate and very lightly vermiculate ; yellowish brown 

 or chestnut-brown, unicolored, or with a light band above the 

 periphery, and a darker band below it ; whorls 5, the last with 

 an obtuse peripheral angle, above which it is obliquely de- 

 pressed, suture well impressed, base excavated around the 

 umbilicus, into which a columellar callus is deeply impressed ; 

 aperture white. Diam. 115, alt. 70 mill. 



Is. of Luzon artd Panay, Philippines. 



It is N. meridionalis, Wood, N. Otaheitana, Per., N. Tahei- 

 tana, Hartm. 



N. RHEA, Pfr. PL 9, fig. 30. 



Imperforate when adult, solid, striate and with deeply im- 

 pressed vermicular sulci, giving the surface a rugose appear- 

 ance ; chestnut-colored, darker on the base, the periphery with 

 a light colored band, and a darker one below it ; whorls 5, round- 

 shouldered below the suture, the last obsoletely angled at the 

 periphery, obliquely flattened above, rounded beneath ; aperture 

 white, the columellar callus deeply impressed into the umbilicus. 



Diam. 69, alt. 37 mill. 



Isl. Panay, Philippines. 



Much more rugosely sculptured than N. ovum, with more 

 shouldered whorls. 



