STREPTOSTELE. 109 



S. NEVILLI, H. Adams. PI. 20, fig. 77. 



Imperforate, somewhat solid, a little shining, obsoletely longi- 

 tudinally striate, whitish, suture margined ; columella slightly 

 twisted, lip thin, flexuous and thickened in the middle. 



Length, 20 mill. Seychelles Islands. 



Dr. Dohrn thinks this species more closely related to Gibbu- 

 lina, and that it should be placed in the vicinity of G. palanga^ 

 Lesson. 



S. MORELETIANA, Dohrn. PI. 20, fig. 75. 



Imperforate, thin, ribbed-striate, shining, pellucid, hyaline; 

 suture margined and distinctly crenulated ; columella twisted, 

 obliquely truncate, lip simple, thickened, thinner above. 



Length, 6'5 mill. 



Prince's Island. 

 S. SWINHOEI, H. Adams. PL 17, fig. 30. 



Narrowly umbilicate, thin, shining, lightly striate, whitish ; 

 lip thin, shortly reflected, attenuated and sinuous above. 



Length, 16 mill. I 



Formosa. 

 S. AURICULATA, Morelet. PI. 20, fig. 42. 



Very shortly rimate, longitudinally costulate, crystalline, 

 whitish ; aperture with a tooth-like parietal callus ; lip slightly 

 expanded, a little callous, flexuous, slightly incised above, colu- 

 mella dilated above. Length, 9 mill. 



Isle Mayotte. 

 S. MARTENSIANA, Morelet. PI. 20, fig. 47. 



Superficially rimate, thin, crystalline, diaphanous, arcuately 

 costulate-striate, suture profoundly denticulate; aperture with 

 a prominent, compressed parietal callus, lip shortly expanded, 

 slightly reflected, a little receding above. Length, 14 mill. 



Ins. Mayotte. 

 Section PTYCHOTREMA, Morch, 1852. 



S. MOBCHI, Pfr. PI. 19, fig. 1. 



Rimate, somewhat solid, striulate, alabastrine, suture mar- 

 gined, last whorl bisulcate below the middle; aperture with two 

 parietal plicae, columella profoundly plicate, acutely bidenticu- 

 late, right margin with a superior tooth, and two long lamellae 

 within the throat below it. Length, 18 mill. 



Guinea. 



Pupa GuineensiSj Morch, is a synonym. 



