THE TANGANYIKA PROBLEM. 
129 
There was a small variety of Planorbis , a small Bithynia 
and Melania tuberculata among the gastropodean molluscs, 
one or two species of fresh-water bivalves, closely allied 
to the unios found generally in the African lakes, and 
apparently nothing else ; the most striking feature about 
the fauna of Lake Kivu being the apparent absence of 
Viviparas. 
North of Kivu we have the Albert Edward and the 
Albert Nyanzas, the faunas of which can very well be 
treated together. These two lakes are distinctly interesting. 
They lie at the respective altitudes of 3,000 and 1,700 
feet above the level of the sea ; or, in other words, they 
repeat the conditions with respect to altitude and climate 
which were encountered in the case of Tanganyika and 
Nyassa. The fauna of both the Nyanzas is abundant — 
perhaps quite as abundant as that of Nyassa — but in both 
lakes it is composed of only a very few forms of fishes, 
and half a dozen species of inollusca at the most. In many 
portions of both the Nyanzas the beach is composed of 
actually nothing else but the shells of Melania tuberculata. 
In the Albert, so far as is at present known, the fauna 
consists of the following types : — 
ALBERT NYANZA. 
FISHES. 
Petrochromis Andersoni (Blgr. ).* 
1. Planorbis adowensis Bgt. 
2. ,, apertus Marts. 
3. Ampullaria stuhlmanni Marts. 
4. Vivipara rubicunda Marts. 
5. Cleopatra pirothi Jick. 
6. Bithynia alberti E. Sm. 
7. ,, walleri E. Sm. 
MOLLUSCA. 
8. Melania tuberculata Mull. 
9. ,, liricincta E. Sm. 
10. Unio acuminatus H. Ad. 
11. ,, bakeri H. Ad. 
12. Mutela nilotica Fer. 
13. Corbicula radiata Phil. 
14. Sphrerium species indeterminate. 
* It is to be noted that most, if not all, the other species of fish found in the Albeit 
Edward occur in the Albert as well. Only the new forms were, however, collected. 
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