408 ]\Ir. II. C. Burnup on South- African 



tlie denticle between the inferior parietal and the columellar 

 plait, is very variable ; it is sometimes seen on the parietal 

 wall, sometimes on the columella, and sometimes in the 

 angle between. 



Var. minor, Bens. ? (PI. X. figs. 5, 6.) 



I also take this opportunity of offering figures of two shells 

 in the collection of Mr. Ponsonby given to him by Mr. Ben- 

 son as representing his species P. sloaphora. They agree 

 in all essentials witii P. layardi^ Bens., except in their 

 smaller size and darker colour (tiie larger specimen is chestnut- 

 brown, tlie smaller rather paler). 



The following are the dimensions : — 



Fig. 5. Height 6-88, width 3-07 mm. 



Fig. 6. „ 5;67, „ 2-75 „ 



The figures are given as a contribution towards answers to 

 Melvill and Ponsonby's questions, '' What is P. stoaphora, 

 Bens. ? '.' and " Can this be a synonym of the var. minor ? " 

 Since the shells given out by the author as P. stoaphora, 

 Bens., seem to agree so closely with the description of his 

 P. Jayardi, var. minor, and since neither Messrs. Melvill 

 and Ponsonby nor Dr. Sturany can trace the debatable 

 species, it seems reasonable to infer that Benson changed its 

 name to var. minor before publication of his differentiation. 



13. Pupa noltei, Bttg. 

 Bqettger * places this species in Leucochiloides (Microslele). 



14. Piipa perple.xa, Burnup. 



Excepting that the word hbrum is printed " labium,^' tiie 

 description in the Survey appears as it was written. As, 

 however, it contains certain ambiguous expressions, I emend 

 it as follows : — 



Shell very small, umbilicate, cylindrical, thin, translucent, 

 shining, pale bronni ; spire cylindrical, rounded above, sutures 

 impressed, apex obtuse ; whorls 6, very convex, closely trans- 

 versely lirate, except the first two which are smooth, the 

 shell at the fourth, fifth, and sixth whorls of nearly equal 

 width, the last half-whorl acquiring its greatest expansion 

 a little below the suture and then being flattened beneath, 

 forming an infrasutural angle, the last whorl compressed 

 towards the umbilicus ; aperture rounded, nearly ^ tlie 

 height of the shell; peristome whitish, reflexed, especially 



* Abhandl. d, Senckenb. naturf. Gesell. Bd. xxxii. (1910) p. 415. 



