58 HENRY CLIFDEN BUENUP. 



Ennea column ella Melv. & Pons., f . typica. PI. V, 



fig. 47. 



Ennea columnella Melv. & Pons., Ann. and Mag. Nat. Hist., vol. viii 

 (1901), p. 316, pi. ii, fig. 2 ; Connolly, Ann. S. Af. Mus., vol. xi 

 (1912), p. 69. 



In the original figure the parietal plait appears to be 

 wholly internal, which is quite wrong, as its right side arises 

 above, and in front of, the aperture. Hence a new figure 

 has become necessary in order that comparison with kindred 

 forms may be facilitated. In the original description the true 

 nature of the very distinctive columellar plait is not very 

 clearly set forth. It is not, as is usual in the South African 

 Enne«, wholly internal; but, from the lower inner edge of 

 a flattish, somewhat scoop-shaped internal surface, a 

 strengthening rib curves outwards almost to the outer edge of 

 the labium. By this feature the species can be readily dis- 

 tinguished from other species of similar size and superficial 

 likeness. 



I have not found the peristomatal processes of the many 

 examples that I have examined exhibit among themselves con- 

 siderable variation, as Melvill and Ponsonby did in the 

 original lot ; but, as one of my " co-types " belongs to a 

 different species, described in this paper as Ennea mel villi, 

 the divergence from the type that they observed seems easily 

 explained. 



The figure here presented is drawn from a co-type in my 

 collection from the original lot found by McBean in the Kar- 

 kloof Bush. The shell measures as follows : Height 2*15 mm., 

 width POO mm., and is the lai-gest that I have examined. 



The following measurements of shells collected by me at 

 Dargle have also been taken : 



Height X width: 2-08 x 0-89, 2-06 x 0-98, P99 x 0*92, 

 1-99 x 0-90, 1-98 X 090, P97 x 0-94, P87 x 0'92 mm. 



The original width dimension of '75 mm. is probably wrong, 

 as the original figure, taking the height as 2 mm., represents 

 the width to be 1 mm., and Connolly^s measurement of the 

 type as communicated in lit., gives height 2, width 0'9 mm. 



