NANINA. 127 



N. THOMENSTS, Dohrn. PL 42, figs. 2, 3. 



Narrowly umbilicated, thin, pellucid, striatulate ; reddish or 

 yellowish corneous ; whorls 4-5, suture margined, usually white 

 threaded, periphery subangulated. Diam. 12, alt. 9*5 mill. 



Ins. St. Thomas, W. Africa. 



N. CHRYSOSTICTA, Morelet. PI. 42, figs. 94-96. 



Perforate, thin, smooth, radiately striated at the suture, shin- 

 ing, pellucid ; fulvous or yellowish corneous, with irregular 

 straw-colored opaque dots and maculations ; spire more or less 

 depressed ; whorls 5-5-j, periphery obtusely angulated. 



Diam. 13, alt. 6 mill. 



Ins. St. Thomas, W. Africa. 



N. AGLYPTA, Dohrn. PI. 42, figs. 4, 5. 



Perforation nearly covered, striulate, slightly shining, dia- 

 phanous; reddish corneous ; whorls 7, periphery carinated. 



Diam. 10, alt. 10 mill. 



Prince's Isl., Guinea. 



N. CALAMECHROA, Jonas. PI. 42, figs. 8, 9. 



Perforate, thin, shining, pellucid, regularly striate and very 

 lightly spirallj 7 lined, forming a decussation scarcely apparent 

 to the naked eye ; straw-colored ; whorls 5^. 



Diam. 17, alt. 8 mill. 



Guinea. 

 It is N. tenera, Jonas, in litl. 



N. EGENULA, Morelet. PI. 42, figs. 91-93. 



Perforate, thin, somewhat solid, rather smooth, shining, pel- 

 lucid, corneous; whorls 4^. Diam. 7, alt. scarcely 4 mill. 



Senegal. 

 N. COLUMELLARIS, Pfr. PI. 42, figs. 6, 7. 



Scarcely perforate, thin, pellucid, smooth; amber-colored; 

 whorls 4^, suture margined ; columella bearing a tooth-like 



thickening of callus. Diam. 7, alt. 4 mill. 



Senegal. 

 N. OLEOSA, Pfr. PI. 42, figs. 100, 1. 



Subperforate, thin, smooth, oleaceous-shining ; brownish cor- 

 neous ; whorls 4^. Diam. 5 '6, alt. 3 mill. 



j W. Africa. 



