ON SOUTH AFRICAN ENNE^. 45 



bi'oad tooth on the cohimellar lip is even less conspicuous 

 than in the typical form. 



Height 2-84, width 1-50 mm. 



Hab. — Karkloof (McBean & Taynton) ; Nottingham Road 

 (Taynton) ; and Ntimbankulu, Mid-Illovo (Burnup), all in 

 Natal. 



The dimensions given above are those of a co-type of 

 "E. berthas M. & P.," from the original lot collected by Mr. 

 McBean at Karkloof^ now in my collection at the Natal 

 Museum (Mus. No. 1441), and here figured. Those of the 

 type in the original description are manifestly wrong, for 

 they give a ratio of width to height of 35"71 per cent., while 

 the figure represents a ratio of 50*98 per cent., the latter 

 being Avell supported by my shell and new figure with a ratio 

 of 52" 11 per cent. It will be seen that if Melvill and Pon- 

 sonby's height dimension of 3"5 mm. be a misprint for 2'5, 

 and the width measurement of 1'25 mm. be correct, a ratio of 

 50 per cent, is established, corresponding very satisfactorily 

 with their figure ; but in this case their shell is rather smaller 

 than any that I have examined. The suggestion of a mis- 

 print, however, is supported by the fact of the dimension line 

 alongside their figure being 2"6 mm. long. 



The other known specimens of this variety, excepting the 

 two in McBean^s collection, whose dimensions I have not 

 been able to ascertain, measure as follows : 



Karkloof: height x width, 3-11 x 1-50,2-85 x 1-55,2-79 

 X 1*44 mm. Nottingham Road : 3-25 x 1-52,2-86 x 1-50 mm. 

 Ntimbankulu: 3-32 x 1-59, 3-13 x 1-57 mm. 



Although Messrs. Smith and Robson concur in my view that 

 this form belongs to the species f arquhari Melv. & Pons., 

 they have expressed no opinion as to its claim to varietal 

 distinction. I think, however, that such a distinction is not 

 only desirable, but inevitable, since it can be distinguished 

 from the typical form by the characters above enumerated, 

 and inhabits a different district, the variety having only been 

 met Avith in the Province of Natal, and the typical form in 

 the Province of the Cape of Good Hope. In three of the 



