50 



Proceedings of the Royal Society of Victoria. 



Professor McCoy, in his " Prodromus of Victorian Zoology," 

 long ago pointed out the remarkable distinctness between the 

 fishes of the rivers which flow into the Bass Straits and those 

 of the rivers of the Murray system. 



The absence of Gadopsis from the northern rivers of Victoria 

 may be due to the presence of Oligorus. Young individuals 

 occur in the upper reaches in which Oligorus does not, and the 

 introduction of the Murray Cod into the Yarra since 1857, has 

 practically destroyed the Blackfish in that river. 



The close correspondence of the South Victorian and Tas- 

 manian genera, often species, will be obvious from the table. In 

 the case of Galaxias almost every local stream or lake has its 

 own varieties. A similar variation has been noticed by Macleay 

 and by Ogilby in the New South Wales species of Galaxias. 



