(179) 



8. Notes on South African Non-marine Mollusca. By M. CONNOLLY. 

 (Continued.} 



IV. A hitherto unnamed variety of DORCASIA ALEXANDRI Gray. 



IN the Monograph of Dorcasiinae, published last year in these 

 Annals, I mentioned on p. 177 a shell from the Erougo Mountains, of 

 which I had then only seen a single specimen, as being probably 

 worthy of a varietal name. 



Through the kindness of Messrs. Henry Burnup and John Pousonby- 

 Fane I have now been enabled to examine an extensive series of this 

 form, collected on Mt. Usakos by Mr. P. Ross Frames, and can thus 

 furnish further particulars. 



To Mr. Burnup I am also much indebted for copious notes, whose 

 incorporation in the present paper adds greatly to its value, and 

 reduces my own task to a minimum. 



DORCASIA ALEXANDRI Gray, var. MONTANA, nov. 1916. 



Shell depressed-globose, widely umbilicate, rather thin, translucent, 

 Type slightly bleached, pale chestnut above, shading to pale greyish- 

 yellow beneath, peristorne yellowish-white. Spire but little raised, 

 though each whorl, in profile, projects clearly above the next ; apex 

 obtuse. 



Whorls 5, very rounded, rapidly increasing, the 2 apical almost 

 smooth, remainder prettily sculptured above with very fine, close, 

 regular, curved striae, which become much fainter beneath ; last whorl 

 descending rapidly in front ; suture simple, rather deep. Aperture 

 acuminate-ovate ; peristonie quite free, continuous, margins not 



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