Species and Varieties of Pupa. 409 



at the columellar margin, thickened, the ends converging 

 and connected by a tliin callus ; labrura slightly incurved 

 about the middle ; columella straight. The processes of 

 the aperture consist of a small wiiite parietal plait running 

 inwards and there becoming strong, a stout white post- 

 columellar plait also running inwards, and a profoundly post- 

 labral tooth or plait hidden by the columella. 



The following are the dimensions of the shell figured in 

 the Survey : — 



Fig. 17. Type: height 1-72, width 0-82 ram. 

 „ 18 (sectional). „ I'SO, „ 0-77 „ 



Twenty-four out of twenty-six specimens measured by me 

 show very little variation in dimensions, the remaining two, 

 both apparently mature, being somewhat more divergent, 

 viz. : — 



Largest : height 1'88, width 0*83 mm. 



Smallest: „ I'oO, „ 0-77 „ 



Bloemfontein {Connolly) may now be added to the localities 

 quoted by Melv. & Pons, 



Judging by the descriptions and figures alone, for I have 

 not seen Jickeli's species, this shell must be akin to his 

 P. lardea, schilleri^ and similis from Upper N ubia *, whose 

 apertural y)rocesses seem arranged much on the same plan, 

 its nearest ally being the last named ; similis is, however, 

 about one-fourth wider than the present species and has lialf 

 a whorl less, while the peristome is less expanded and the 

 labrum less bowed inwards, and there is no callus. P. lardea 

 and schilleri are more divergent, being not so high as similis 

 and broader in proportion. 



15. Pupa pretoriensis, M. & P. 



16. Pupa psichion, M. & P. 



I have not seen specimens that could be referred to either 

 of the above two species in the very large series of shells from 

 Pretoria that I have been fortunate enough to have laid at 

 my disposal for examination, though the number, since my 

 first study of the group, has been greatly augmented by the 

 collections of Major Connolly. 



17. Pupa quantula, M. & P. 



The co-type in Mr. Ponsonby's collection, figured in the 



* Jick. Faun. L. u. Sussw. MoU. N.O.-Af. (1874) pp. 124, 125, 296, 

 pi. V. figs. 14-16. 



Ann. & Mag. N. Hist. Ser. 8. Vol vii. 27 



