74 .HENRY CLIFDEN BURNUP. 



this little-known species, which will be easiei- of access to 

 South African readers than the orig-inal. 



Shell small, elongate, cylindrical, narrowly umbilicate, thick, 

 white, opaque, apex rounded; whorls 7^, slightly ventricose, 

 the first 3 smooth, the next 4 nearly smooth, except im- 

 mediately below the suture, whei'e they are clearly, rather 

 coarsely transversely rib-striate, and the last half whorl simi- 

 larly rib-striate all over, except immediately behind the lip, 

 where it again becomes smooth ; suture moderately deep ; 

 aperture rather large, rounded, with peristome much 

 thickened, expanded and reflexed, with well-developed callus 

 connecting the extremities, and furnished with the following- 

 processes : a strong blade-like in-running parietal plait, a 

 large prominent, bluntly pointed labral tooth with corre- 

 sponding pit outside, a small tooth near the base of the 

 columellar lip, and a medium-aized deep-seated columellar 

 plait, flattish and drawn to a small mammillated point at the 

 lower right corner. In addition to these regular processes 

 there is a very minute denticle on the outer, upper edge of 

 the labrum, close to the suture, not shown in the fig. 



Height, 5"89; width (including expanded labrum), 2 '21 mm. 



Hab. — Albany District, Cape of Good Hope (Penther). 



The width of the shell gradually increases with each 

 successive whorl after the rapid increase of the apex, so 

 giving the spire a somewhat bluntly elongate-conical form. 

 To what extent the opaqueness of the shell may be considered 

 characteristic of the species, or to Avhat extent it may be due 

 to incipient erosion, could only be decided were more ex- 

 amples available for examination ; but its solidity suggests 

 that in maturity it would always be opaque : my shell, though 

 in good condition, does not appear to have been collected 

 alive, so slight erosion in it is probable, though it is not 

 conspicuous. The minute denticle on the outer, upper edge 

 of the labrum, which is very inconspicuous, may not be 

 characteristic, and is scarcely worthy of note except as regards 

 a comparison of this shell with one of the forms of Ennea 

 m on tan a Melv. & Pcma. (PI. V, fig. 60), hereafter discussed. 



