iS 2 SOME ETHIOPIAN REPTIIES, FISHES, AND INVERTEBRATES 



The evidence was, however, shaken by the occurrence of the species in the Niger, 

 and it is completely discredited by the discovery in the Yang-tsi-kiang. The case 

 is, however, somewhat different with regard to Lake Karun, where there is also 

 found a species of hydroid zoophyte of the genus Cwdylophora, such zoophytes 

 being normally denizens of estuaries and broads in direct connection with the 

 ocean. Hence it is concluded that Lake Karun had, at no very distant date, free 

 communication with the sea. 



These conclusions are supported by the essentially fresh- water 

 character of the shrimps of Tanganyika. All the rivers of Ethiopian 

 Africa abound in crabs, but are entirely lacking in crayfishes — a fact of very 

 considerable interest and importance in the geographical distribution of animals. 



