90 TRUNCATELLINA OP SOUTH AFRICA. 



British East Africa : Naivasha. 



Ennea naivashaensis PRESTON, Revue Zoologique Africaine, 

 i, 1911, p. 219, pi. 11, f. 3. Ennea nawashaensis Preston var. 

 elgonensis PRESTON, Proc. Zool. Soc., 1913, p. 211. 



T. n. elgonensis (Preston). Shell even more cylindrical 

 than the typical form, with more closely set and more pro- 

 nounced transverse riblets, the aperture also, through not 

 being contracted at the base, has a less triangular appearance. 

 Alt. 1.75, diam. maj. 1 mm. (Preston). 



Mt. Elgon, Uganda (C. W. Woodhouse). 



23. TRUNCATELLINA MUTANDAENSIS (Preston). PL 9, figs. 19, 

 20. 



Shell differing from Ennea naivashaensis Preston, from 

 Naivasha, British East Africa, in its darker color, more cylin- 

 drical form, less convex and rather longer whorls, and in the 

 broader and more basally rounded aperture. Alt. 2, diam. 

 maj. 1 mm. (Preston). 



S.-W. Uganda: between Lake Mutanda and Lake Kivu 

 (Robin Kemp). 



Ennea mutandaensis PRESTON, Proc. Zool. Soc. Lond., 1913, 

 p. 211, pi. 34, f. 13, 13a. 



VI. SOUTH AFRICAN SPECIES. 



These species are closely related to those of Abyssinia and 

 Europe, distinguished from them merely by specific details. 



T. dysorata and quantula are not known to the writer by 

 specimens, but all the others have a columellar lamella in 

 form of an oblong, vertical tubercle, strong or low, and either 

 visible from in front or more often dorsal in position, and 

 hardly to be seen without breaking the shell. Whether dyso- 

 rata and quantula are really without the columellar tooth, 

 like the cylindrica group of Europe, is not known. 



Most of the South African species are like T. insulivaga of 

 the Loochoo Is. and T. uniarmata of Europe in lacking a 

 parietal lamella. It is present in T. perplexa only. 



Pupa haploa and P. psychion M. & P. are lost species, not 

 included in the following key. 



