26 NANINA. 



to have been smoother and lighter colored and somewhat larger, 

 7 mill. diam. 



N. ROURIGUENSIS, Crosse. PI. 6, fig. 99. 



Scarcely umbilicated, thin, strongly striate, and with micro- 

 scopic spiral lines; olivaceous brown; whorls 5^, suture well 

 marked, the last whorl obtusely angulated on the periphery, 

 nearly smooth and somewhat shining on the basr. 



Diam. 12, alt. 7 mill. 



7ns. Rodriguez. 



Rather distantly related to the several foregoing species. 



Section STYLODONTA, Jan., 1832. 

 N. UNIDENTATA, Chemn. PI. 6, figs. 84, 85. 



Imperfo rate, striated, sculptured with concentric wrinkles and 

 oblique decussating minute lines ; yellowish brown to dark 

 chestnut-colored ; whorls 6, the last angulated and sometimes 

 narrowly banded on the periphery ; lip slightly expanded ; 

 columellar tooth-like fold large. Diam. 2, alt. 1'75 inches. 



Seychelles Is. 



N. militaris^ Pfr. (unfigured), may be the more depressed form 

 of this species (fig. 85). The synonymy includes N. microdonta, 

 Desh.; N. ventricosa, Jan.; N. uniplicata, Morch. 



N. CEPOIDES, Lea. PI. 6, figs. 86, 87. 



Imperforate, plicate-striate, here and there obsoletely spirall}' 

 striate ; whorls 6^, convex ; brownish above, yellowish brown 

 beneath, often narrowly brown banded at the suture and 

 periphery, these bands frequently overlaid by a fugacious color- 

 ing of yellowish white or pure white, more or less broken up into 

 patches; aperture narrow, oblique, the lip expanded, the colu- 

 mellar plication distinct. Diam. 2, alt. 1*75 inches. 



Philippine Islands. 



N. dolium, Sowb., is a synonym. 



N. STUDERIANA, Fer. PI. 6, fig. 88. 



Imperforate, rather thin, obliquely striated and transversely 

 very minutely wrinkled ; whorls 6, upper ones rather flattened, 

 elegantly granulated, the last obsoletely angled or marked at the 

 periphery with an impressed groove ; dark brown or olive-brown, 



