166 



J. E. S. MOORE. 



originally found. The remarkable isolation and independ- 

 ence of the Halolimnic fauna which these facts disclose is 



Table I. — Showing the Molluscan Genera which have 

 hitherto been recorded in the Principal African 

 Lakes. 



Normal 



'Lacustrine 



Series. 



Halolimnic 

 Group. 



Lake Dumi contains Ampullaria and Mutela. Lake Elmentella, Limnsea 

 and Physa. I have not thought it worth while including these small lakes in 

 the above list. 



of the first importance when we attempt to ascertain from 

 what source they may have sprung; it is extremely important, 

 therefore, that the conclusions which result from the study of 

 the geographical distribution of these forms can be corrobo- 

 rated from another point of view. 



