the South- African Stenogy rinse. 271 



11. Curvella modesta, sp. n. (PI. VI. fig. 15.) 



Shell small, conic-ovate, rather subulate, rimate, pale 

 olivaceous, thin, glossy, almost transparent. Spire produced, 

 acute, evenly tapering, apex rounded. Whorls 5^, regularly 

 and rather rapidly increasing in distance between sutures, 

 rather convex, covered, after the first 1^, with fine, regular, 

 curved striae, which are almost invisible without a strong lens. 

 Suture well defined, of moderate depth. Aperture ovate, 

 rounded at base. Peristome simple, acute. Outer lip some- 

 what curved outwards and slightly arched forward. Columella 

 very slightly concave, margin narrowly reflexed. 



Shell 6*8 x 28, aperture 2*5 x 1*2, last whorl 4 mm. 



Hab. Cape Colony, Dassie Crantz, Grahamstown ; Cra- 

 dock Commonage (Farquhar). 



A difficult little species, recalling both C. elevata and 

 C. straminea, Burnup. From the latter it differs chiefly in 

 colour, being pale olivaceous instead of stramineous, while it 

 is a rather more slender form than C. elevata. 



Genus Hypolysia, Melv. & Pons., 1901. 

 (Ann. & Mag. Nat. Hist. viii. 1901, p. 318.) 



A slender form, distinct from Opeas through its projecting 

 evolute outer lip. 



1. Hypolysia jlorentice, Melv. & Pons. 



1901. Hypolysia Jlorentice, M. & P. Ann. & Mag. Nat. Hist. viii. p. 318, 



pi. ii. fig. 8. 

 1903. Hypolysia Jlorentice, M. & P. Ann. & Mag. Nat. Hist. xii. p. 596, 



pi. xxxii. fig. 13. 

 1906. Hypolysia Jlorentice, M. & P., Pilsb. Man. of Conch, xviii. p. 37, 



pi. x. figs. 66, 67. 



Hab. Widely distributed through Natal, Zululand, and 

 the Eastern Province of Cape Colony. 



A very finely striate, transparent, narrowly rimate shell, 

 generally somewhat fusiform in contour, with distinctly 

 filiform suture. 



This species is unusually subject to dimorphism, some 

 specimens from Eshowe being nearly double the width of the 

 type, though otherwise agreeing with it in all respects. 



Owing to the sculpture following the peculiar curve of the 

 outer lip, it is not difficult to distinguish Hypolysia even if 

 the evolute lip itself is broken. 



