OPEAS, SOUTH AFRICA. 149 



aperture, but spreading outwardly in a broad and distinctly 

 denned deposit. Length 9, diam. 3, aperture 2.25 x 1.75 mm. 

 (Marts.). 



Uganda: Buddu coast, in the shore forest (Emin Pasha, 

 Stuhlmann) . 



Opeas s., MARTS., Beschalte Weich. p. 127, pi. 5, f. 30. 



"The shape of the mouth reminds one of Streptostele, but 

 the columellar margin is less spirally twisted, the outer lip is 

 not thickened and the surface of the shell is not smooth and 

 glossy. The young shells of Streptostele costulata are dis- 

 tinctly more slender than this snail. " 



IV. South African Species. 



22. 0. CRAWFORDI (Melvill & Ponsonby) . PI. 15, fig. 74. 

 Shell very thin, glassy, tapering, cylindrie, whorls 5, 



smooth, ventricose, longitudinally very delicately striatulate 

 under the lens; last whorl produced. Aperture oblong; 

 peristome simple, unexpanded; columellar margin a little 

 thickened. Largest specimen, length 4.5, diam. 1.5 mm, 

 (M. & P.) 



South Africa: Van Staaden's River (J. Crawford, Esq.). 



Stenogyra crawfordi M. & P., Ann. and Mag. N. H. (6) 

 xii, p. 105, pi. 3, f. 4 (Aug. 1893). 



"A smoothish glossy species, to which we cannot assign 

 a place as the young of any South African form with which 

 we are acquainted, several of the specimens before us being 

 apparently full-grown. ' ' 



23. 0. DURBANENSE Sturany. PL 15, figs. 75, 76. 



The conic shell, composed of 6% whorls, is more or less 

 gradate; it is translucent, slightly glossy, and of a greenish 

 color, with obtuse apex and a quite weak thread-like suture. 

 Only the most delicate growth-striae are visible under the 

 lens. The columellar margin of the peristome is somewhat 

 reflexed, leaving only an inconsiderable umbilical crevice. 

 Length 8.7, diam. 3.3, length of the aperture 3.5, width 1.7 

 mm. (Sturany). 



Natal: Durban (Dr. Penther). 



