FAUNA OF THE AFRICAN LAKKS. 



593 



Text-figure 1. 



Curve showiiKj groioth of knowledge oj Tanganyika fauna. 



1B50 1660 



1970 



1680 



1890 



1910 



1920 



The relative peculiarity of eacli lake fauna, as far as totals only 

 are concerned, can be best illustrated by giving the figures in 

 parallel columns with the marks E or P against them. 



An examination of these totals at once reve; 

 in which the fauna of Tanganyika is distinct, 

 the lake contains a more extensive series of for 

 other. In the second place, those types gi 

 which are unknown elsewhere (293 out of 

 points, viz. total number of species and corr 

 of endemics, are shown graphically for each hi. 

 table : — 



Ills the chief points 

 In the first place, 

 ms (402) than any 

 •eatly predominate 

 402). Both these 

 esponding number 

 ke in the followins: 



