Feference List of South African Non-marine Mollusca. 89 
Although the extremes of form vary greatly, almost every inter- 
mediate grade can be traced, so that the varietal name is hardly 
retainable. 
110. Ennea zetora, Melv. & Pons. [S.A.M.] 
1907. Hnnea zelota, M. & P., A.M.N.H. xix. Devito G; 1. he LF, 
Type in British Museum. 
Hab. Nata. Port Shepstone; Equeefa (Burnup). 
Genus STREPTOSTELE, Dohrn, 1866. 
(Mal. Blitt. xiii. p. 128.) 
Type of Genus, S. lotophaga (Morel). 
111. STREPTOSTELE HERMA, sp. nov., pl. 2, f. 3. [S.A.M.] 
Shell very small, elongate, narrowly rimate, slightly glossy, trans- 
lucent, milky olivaceous. Spire produced, tapering, very narrow, 
apex rounded. Whorls 7, gradually increasing, little convex, but 
impressed at the suture; the first 2 smooth, remainder beautifully 
sculptured with rather coarse, irregular, almost straight striae, 
Suture deep. Aperture short, piriform, virtually edentulate, the 
only processes being an almost imperceptible parietal callosity, and 
an incurvation of the outer lip about one-third of its length below 
the suture. Peristome not thickened, thinly reflexed. 
Shell 45x 1:3; aperture ‘9-8; last whorl 1:5 mm. 
Type in British Museum. 
Hab. Ruopesta. Victoria Falls (Connolly). 
This beautiful little species belongs to a group of Central African 
shells which have been placed of late years in Streptostele. As their 
columella is not achatinoid, as it should be in Dohrn’s genus, it is 
probable that a new section will have to be founded for them. 
Famity RHYTIDIDM, Pilsbry, 1898. 
(Man. of Conch. viii. p. 135.) 
Genus NATALINA, Pilsbry, 1893. 
(Man. of Conch, viii. p. 135.) 
(= Aerope, Albers, 1860, non Leach, 1813.) 
Type of Genus, N. caffra (Fér.). 
The species which follow have been variously attributed to 
Natalina, or to Ehytida, Albers (Die Helic., 1860, p. 89. Type 
greenwoodi, Gray), and its subgenera, Macrocycloides, von Martens 
