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Prof. Dr. Max Weber on the 



modified Indian species, we must conclude that the whole of 

 this area has remained geologically isolated from the other 

 regions of this zone since the commencement of the existence 

 of Teleostei, and that, with the exception of Ceratodus and 

 Osteoglossum, the immigration of the other species is of very 

 recent date." 



To this statement we may be permitted to add the following 

 remarks : — Firstly, the fish-fauna of Celebes is somewhat 

 different from what Giinther was aware of at that time. 

 This has been explained at length above. Arius and Plo- 

 tosus are unquestionably forms which have wandered in from 

 the sea, and belong only to the river-estuaries. 



As touching the further agreement with the fish-fauna of 

 Australia, I have drawn up, in answer to this question, a list 

 of Australian fishes. Although this may be incomplete, it 

 will nevertheless represent the character of this fish-fauna. 

 Only those genera are given here which have been recorded 

 from the tropical regions of Australia : — 



From this list it may be seen that three elements go to 

 form this fish-fauna : — 



1. Marine immigrants, which belonged originally to the 

 tropical Pacific, and could therefore penetrate into the rivers 

 of all islands and countries washed by this ocean. They 

 show nothing characteristic of the Australian fauna. Parallel 

 or similar species are chiefly found in Australia and Celebes, 

 for example, but they also occur in the rivers of the large 



