ON SOUTH AFRICAN ENNEJil. ^7 



aberrant forms from Karkloof and Rosetta, the close relation- 

 ship seems manifest. I think the Nottingham Road form, 

 which is also found at Karkloof and Curry's Post, showing the 

 extreme divei'gence from the type and being well established 

 in numbers, may conveniently be distinguished by a varietal 

 name, contracta being chosen in reference to the pinched 

 appearance of its aperture, while the aberrant forms remain 

 undistinguished in name, simply as forms intermediate 

 between m a r i t z b u r g e n s i s, typical, and its variety. These 

 intermediates have not so far been found plentifully ; from 

 Karkloof I have four specimens coi-responding with fig. 45, 

 taken with twenty-seven specimens of var. contracta; and 

 from Rosetta I have two specimens only, corresponding with 

 fig. 46, without representatives of contracta. These, how- 

 ever, are from a small parcel, of whose numbers I have no 

 record, given to Mr. Ponsonby by Miss Hickey ; but it is 

 justly presumable that they are a fair sample of the lot, and 

 that var. contracta Avas not collected by Miss Hickey. 



The shell represented by fig. 45 is but little removed from 

 m a r i t z b u r g e n s i s, typical, the peristome being only slightly 

 less expanded, but the labral tooth is much smaller and its 

 bifurcation much less distinct. The Rosetta form, fig. 46, on 

 the other hand, is much nearer var. contracta, the shell 

 being almost equally small and the peristome much narrowed ; 

 but the aperture is relatively large, so avoiding the pinched 

 appearance of the named variety. 



The dimensions of other specimens are as follow : 



Intermediate form from Karkloof : height x width, 4*47 X 

 1-89, 4-31 X 1-95, 4-09 x 1-97 (fig. 45), 4-03 x 1-94 mm. 



Intermediate form from Rosetta : 3-68 x 1-76, 3-46 x 1-76 

 mm. (fig. 46) . 



Var. contracta from Nottingham Road: 3"73 x 1*73, 

 3-51 X 1-76, 3-38 x r66, 3-13 x 1-63 mm. 



Var. contracta from Karkloof: 3"60 x 1'66, 3'4() x 1*66, 

 3-43 X 1-68 mm. 



A'ar. contracta from Curry's Post: 3-51 x 1"62, 3"40 x 

 1"(J2 mm. 



