i 3 2 THE TANGANYIKA PROBLEM. 



a shallow, saucer-shaped depression, lying between distant 

 eastern and western lines of mountains and valleys running 

 north and south. 



Further to the east again we have another series of 

 lakes, lying mostly along the course of the great fold 

 which runs from the vicinity of Kilima Njaro to the Red 

 Sea. In these lakes Rudolf, Stephani, Beringo, Nivasha, 

 Elimantita and Nakaroo, there is little of zoological 

 interest. 



But it cannot be said the faunistic characters of Rudolf 

 are as yet fully known, still at the same time, from the 

 observations of Mr. Donaldson Smith and Mr. Harrison, 

 who both spent some time about the lake, it is quite clear 

 that neither in the direction of fishes nor shells is it 

 faunistically remarkable in any way. In Rudolf there 

 have been recorded the following forms of fishes : — 



RUDOLF. 



FISHES.* 



SlLURID.E. 



8. Clarias mossambicus. 



9. Auchenoglanis biscutatus. 



10. Synodontis schall. 



11. ,, zanzibaricus. 



12. ,, cilernii. 



13. Mochocus niloticus. 



POLYPTERID.45. 



1. 1'olypterus senegalus. 



Characinid^. 



2. Hydrocyon forskalii. 



3. Alestes baremose. 



4. , , nurse. 



5. Citharinus geoffroyi. 



6. Distichodus. 



CY.PRINIDiE. 



7. Neobola bottegi. 



Serranid^e. 



14. Lates niloticus. 



ClCHLID/E. 



15. Tilapia nilotica. 



16. ,, zillii. 



Nothing sufficiently definite appears to be known of the 

 invertebrate fauna of Lake Rudolf to make a list advisable. 



* This list of fishes from Lake Rudolf is partly taken from Vinciguerra Ann. Mus. 

 Civ. Genova (2) xix., 1898, p. 241, the nomenclature having been kindly revised for 

 the present work by Mr. Boulenger. 



