124 



THE TANGANYIKA PROBLEM. 



exhausted the fresh- water fauna of Nyassa, at any rate 

 so far as a knowledge of the different types composing it 

 is concerned. When the fauna of Nyassa is considered 

 in comparison with the fauna of the other great lakes of the 

 world, it is perhaps chiefly characterised by its limitations. 

 For it will be seen from the subjoined lists that it consists 

 almost exclusively of fishes and mollusca. The fishes of 

 Nyassa include representatives of seven families, and the 

 contained genera and species which have hitherto been 

 recorded are represented in the following table : — 



Mastacembelid/e. 



27. Mastaecinbclns shiranus Gthr. 



Silurid^:. 



28. Bagrus meridionalis Gthr. 



29. Anoplopterus platyehir Gthr. 



30. Synodontis zambesensis Gthr. 



CYPRINID/E. 



31. Labeo mesops Gthr. 



32. Barbus trimaculatus Ptrs. 



33. Barilius guentheri Blgr. 



34. Engraulieypris pinguis Gthr. 



35. Pelotrophus microlepis Gthr. 



36. ,, microcephalus Gthr. 



Characinid^e. 



37. Alestes imberi Ptrs. 



Cyprinodontid.e. 



38. Haplochilus johnstoni Gthr. 



MORMYRID/E. 



39. Mormyrus diseorhynehus Ptrs. 



40. ,, eat os to in a Gthr. 



41. Mormyrops zainbanenje Ptrs. 



Curiously enough, beyond copepods, cyclops and other 

 minute forms, there are no Crustacea in Nyassa besides 



