the South-African Stenogyrinse. 2(55 



16. Euonyma unicornis, sp. n. (PI. VI. fig. 3.) 



Shell elongate, narrow-fcurriform, rimate, olivaceous, very 

 thin, rather glossy and transparent. Spire much produced, 

 acute, very slowly evenly tapering; apex narrowly rounded. 

 Whorls 11£, very gradually increasing, convex, the first two 

 smooth, remainder sculptured with innumerable close, curved, 

 regular strise, which are not apparent to the naked eye until 

 the fifth whorl. Suture rather deep. Aperture short, nearly 

 elliptical, base rounded. Peristome simple, acute. Outer lip 

 very slightly curved outward, rather sharply arched forward 

 about 1*3 mm. below the suture, and then receding rather 

 rapidly to the base. Columella slightly concave, margin 

 narrowly triangularly reflexed. Callus none. 



Shell 21 x 4*4, aperture 4*2 x 2'5, last whorl 7 mm. Type 

 in my collection. 



Hah. Transvaal, Schanz Kop, Pretoria (Connolly); 

 Potchefstroom (Miss Livingston). Cape Colony, Cradock 

 (Farquhar). 



Although very nearly approaching E. varia, the present 

 species differs constantly in having one more whorl and 

 slightly shorter aperture in comparison to its size, and in its 

 rather more convex whorls. 



The Cradock form has a rather blunter apex and very 

 slightly coarser striation than the type; but without further 

 knowledge of the anatomy it is inadvisable to regard it as 

 different. 



Genus Opeas, Albers, 1850. 

 (Die Heliceen, p. 175.) 



Small shells, rarely exceeding 13 mm. in length, with a 

 large, smooth, obtuse apex ; generally separable from 

 Euonyma by their smaller size and from Curvella by their 

 more slender form. 



1. Opeas crawfordi (Mel v. & Pons.). 



1893. Stenogyra craxofordi, M. & P. Ann. & Mag. Nat. Hist. xii. p. 105, 



pi. iii. fig. 4. 

 1898. Subulina crawfordi, M. & P. Proc. Mai. Soc. iii. p. 179. 

 1898. Opeas crawfordi, M. & P., Stur. Siidafr. Moll. p. 61. 

 1906. Opeas crawfordi, M. & P., Pilsb. Man. of Coneh. xviii. p. 149, 



pi. xv. fig. 74. 



Hah. Cape Colony, Van Staaden's River (Craioford). 

 A very small species, resembling in shape many others 

 distributed over the southern portion of the peninsula, but 

 Ann. & Mag. N. Hist. Ser. 8. Vol. vi. 18 



