tfie South- A/iu'can Sleiiogyriiiie. 20) 



IG. Knuiifittti unicornis, sp. ii. (PI. VI. (i;^. \\.) 



Shell elongate, Tinrrow-turrifonn, riiuute, olivaceous, very 

 ' tliin, ratiicr <;liis.>i}' aiul transparent. Spire rniicli proJiiceiJ, 

 aciito, very slowly cvotjly tapering; apox narro.vly routuled. 

 Whorls 11^, very gr.uluiUy increasing, convex, the tirst two 

 smooth, renriimler sculptureil with innumerable close, curved, 

 regular stria*, which arc not a[)parent to the naked eye until 

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

 elliptical, hase rounded. Peristome simple, acute. Outer li|) 

 very slii^htly curved outward, rather sharply arched forward 

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

 rapidly to the base. Columella slightly concave, margin 

 naiTiJwIy triangularly refle.xod. Callus none. 



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

 in my collection. 



Hub. '1'ka.\sv.\al, Schanz Kop, Pretoria {Connolly); 

 Potchetstroom [Miss Livinyston). Cape ColO.NY, Chadock 

 [Farquhar). 



Although very nearly approaching E. varia, the present 

 species diti'ers 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 Ileliceen, p. 175.) 



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

 laige, smooth, obtuse apex ; generally separable from 

 /J'KO/'ywu by their smaller size an 1 from Curcellu by their 

 more slender form. 



1. Opeas craw/ordi (Melv. & Pons.). 



1803. Stenofft/ra craw/ordi, M. &, V. .\nn. (!v: Mag. Nat. Ili.<t. .vii. ji. 105, 



pi. iii. tig. 4. 

 18S»8. Subulina crarrfurdi, M. A P. Pror. Mnl. Sue. iii. p. l?!). 

 1898. Ojtf'is cratr/firdi, M. .^- P., Stur. J^^u.lafr. Moll. p. CI. 

 HtOt".. Opeat craic/ordi, M. A: 1'., I'llsb. Mau. of Couch, xviii. p. 1 1'.». 



pi. IV. tig. 74. 



If ah. Cape Colony, Van Staaden'.s River {Crawford). 

 A very small species, resembling in shape many others 

 distributed over the southern portion of the peninsula, but 

 Ann. i(- Mag. \. Hist. Ser. 8. lo/. vi. 18 



