NANJNA. 49 



N. SYLVANA, Dohrn and Semper. PI. 23, figs. 69, 70. 



Imperforate, rather thin, obliquely striate and slightly, very 

 minutely spirally lirate above, polished below; horn-colored, 

 with a brown thread at the suture ; whorls 7-8, apex pellucid, 

 last whorl acutely carinate, the carina sometimes appearing on 

 the spire, the upper whorls being slightly exserted. 



Diam. 18, alt. 7 mill. 



Ins. Mindanao, Philippines. 



N. CALCULOSA, Gould. PI. 23, fig. 71. 



Hyaline, fragile, shining, smooth, i m perforate ; light } T ellowish 

 brown ; whorls 4, the last obtusely angulated and narrowly 

 carinated on the periphery. Diam. 2-5-4-5 mill., alt. 2-4 mill. 



Vili and Marquesas Is. 

 N. OBCONICA, Pease. PI. 23, figs. 72-74. 



Narrowl}' perforate, thin, subpellucid, closely obliquely striate; 

 corneous ; whorls 6, lightly margined, the last acutely carinated 

 on the periphery. Diam. 7, alt. 4'5 inches. 



Raiatea, Society Islands. 

 N. SUBRUGOSA. Garrett. PI. 23, fig. 75. 



Imperforate, thin, subpellucid, fulvous, upper surface closely 

 plicately striate, base smooth, gloss}^ umbilical region indented; 

 whorls 4-4^, slowly increasing, the last with a thread-like keel. 



Diam. 2'5, alt. 2 mill. 



Tahiti and Moorea, Society Islands. 



N. TAHITENSIS, Garrett. PI. 23, fig. 76. 



Subperforate, thin, subpellucid, with fine sharp oblique elevated 

 striae above, base smooth, glossy ; whorls 4-J, spire dome-shaped, 

 suture margined above b} T the peripheral keel, which is prominent 

 and thread-like on the last whorl. Diam. 2-5, alt. 2 mill. 



Tahiti, alt. 2000 ft. 

 N. CONULA, Pease. PI. 23, figs. 77, 78. 



Imperforate, thin, upper whorls with subdistant revolving 

 striae, obsolete in the last, base more slightly radiately striate ; 

 whorls 5, the last with peripheral carina ; columella thickened, 

 twisted, with a basal dentiform process. Diam. 7, alt. 5 mill. 



Tahiti, Rarotonga. 

 This is N. Tongana, Schmeltz, not Quoy. 



