168 PKOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



species. It appears to be variable in form and colour, no two localities 

 producing exactly similar forms. 



22. MuTELA, sp. 



JIah. — Swamps of the Kilifi Eiver, and Lake Koncboloro, Tana 

 Valley. 



Two dead shells from these localities differ from J/", Petersi in their . 

 narrower, more elongate form. They appear to belong to a distinct 

 species, but it seems advisable, considering the variability of fresh- 

 water shells, to await further specimens before definitely describing 

 them as new. 



