352 Quarterly Journal of Couchologx. 



incrcmenti ohiiquis sculpti, uUimiis infra incdiiiiii Jiaiui granu- 

 latiis ; apertiira parva, longiL totiiis Yz faiilo si/fcra/is, iiitiis 

 albo diaphana ; columella arcuatissima ct toiia, ad basin abrufle 

 truncate albo marginata ; pcrist. tenuissi/nuni. 



Long. j8 mill. ; dia/n. ly. Apcrtura ly longa. , p lata. 



Hab. Eastern Slope of the Drakensberg Mountains, at 

 Lydenburg Gold Fields, Transvaal, South Africa. 



Shell oblong, thin, pale greenish-straw color ; spire bluntly 

 conical, terminated by an obtuse apex; whorls 7^^, very convex, 

 separated by a deep and almost horizontal suture, crenulated just 

 beneath it and bordered by a very thin, yellowish line ; the sur- 

 face is everywhere (with the exception of the lower half of the 

 body-whorl which is smooth) covered with oblong granules, which 

 are not very observable to the naked eye ; the lines of growth are 

 distinct and a little obliquely inclined ; the aperture is small, being 

 less in length than half that of the entire shell and of a diaphanous 

 whitish color within ; columella very much arched in the middle, 

 tortuous beneath, abruptly truncated at the base, and the edge 

 coated with a thin, white enamel. 



This species in texture and color resembles in a degree A. 

 natalensis Pfeiffer, but its form is very different and the granulation 

 rather finer. In shape and the proportion of the ^\horls it 

 approximates A. polychroa of Morelet, but the volutions are much 

 more convex and the columella is not straight. 



Two specimens of this species and two of A. dimidiata ha^•e 

 been liberally presented to the British Museum by Mr. G. B. 

 Sowerby, jun. 



Jan. 20th, 1 878. 



