NANINA. 47 



N. ORTHOSTOMA, Pfr. PI. 23, tigs. 54-56. 



Umbilicated, closety arcuatel}' striate above, thin, pellucid, 

 light corneous ; whorls 6, narrow, base sinoothish. 



Diam. 10, alt. 5 mill. 



7ns. Panay, Philippines. 

 A doubtful number of the group. 



N. ROTUNDATA, Semper. (Unfigured.) Ins. Luzon, Philippines. 



Section ROTULARIA, Morch, 1852. 



N. MASSONI, Behn. PI. 23, figs. 57, 58. 



Perforate, moderately solid, lightly rugulosely striate, and 

 slightly decussated, somewhat shining ; olivaceous brown ; 

 whorls 5, suture margined, the two last whorls impressed above 

 the carina, the last not descending, base shining. 



Diam. 18. alt. 8 mill. 



Nicobar Islands. 

 N. REINHARDI. Morch. 



Differs from the above in being smaller (diam. 6 mill.), umbili- 

 cus wider, spire more elevated, carina narrower, and want of 

 spiral lines. Xevill makes this a variety of N. Massoni ; it has 

 not been figured, but unless a young shell, it would appear to 

 have sufficient distinctive characters. 



N. FRAUENFELDI, Zelebor. (Unfigured.) Nicobar Islands. 



Section TROCHONANINA, Mousson, 1869. 



N. SCHMELTZIANA, Mousson. PI. 23, fig. 59. 



Imperforate, thin, pellucid, shining above, polished below; 

 yellowish horn-color; whorls 5i, plane above, convex below, the 

 last acutely angulated on the periphery. Diam. 7, alt. 4 mill. 



Ins. Upolu. 

 Var. USURPATA, Mousson. 



Elevatel} T conical, darker, carina less acute, columellar margin 



less callous and nodulous. 



Ins. Savai. 

 N. EXPOSITA, Mousson. PI. 23, fig. 60. 



Imperforate, scarcely shining above, polished below, striulate, 

 chestnut-colored, radiately subfasciate ; whorls 4^-5, flattened 

 above, a little excavated at the peripheral carina, base radiately 



