"48 HENRY CLIFDEN BURNUP. 



markable stability in width of this variety. Among the 

 smooth shells there is a difference in height, between the 

 extremes, of "67 mm. ; but in width there is no more than "06 : 

 among those with infrasutural striation there is, in height, a 

 difference of "49 mm., and in width only '02. 



Ennea darglensis Melv. & Pons, f . typica. PI. IV, 



fig. 32. 



Ennea darglensis Melv. & Pons., Ann. and Mag. Nat. Hist., vol. i 



(1908), p. 130, pi. vii, fig. 1. 

 Ennea darglensis Melv. & Pons. ; Connolly, Ann, S- Af. Mus., vol. 



xi (1912), p. 71. 



The original figure not showing clearly the complex 

 character of the columellar plait and representing the labral 

 tooth as rather too solid and the sculpture too sharply 

 defined, the result possibly of over-magnification, a new 

 figure is here offered. The magnification chosen, about 

 lOf diameters, is the same as that adopted for the figures of 

 the new variety hereunder described, so that a fairer 

 comparison of the variety with the typical form can be 

 made, using the new figure instead of the old. 



The sinuous, duplicate columellar plait is a conspicuous 

 characteristic of the species. The upper branch is wholly 

 internal with its point produced forward ; and the lower, and 

 larger, is less deep-seated, its base arising near the edge of 

 the columellar lip with its point curving inward. From the 

 rimal cavity an axial perforation passes upwards, and, at a right 

 angle thereto, a deep, narrow passage entei-s each branch of 

 the columellar fold. The labral and basal processes are also 

 indicated by depressions behind the peristome. The labral 

 tooth is more distinctly bifid than the original figure suggests, 

 the upper branch being longer, and the lower more internal. 



To the localities cited by Connolly, in his most useful 

 " Revised Reference List of South African Non-marine 

 Mollusca," ^ may be added Bulwer, near which village, in 



1 ' Annals of tlie South African Museum,' vol. xi (1912), pp. 89-306. 



