474 



Causes and Course of Organic Evolution 



Finally, while we have stated that the true fishes, as a great 

 group, form a side line of development that has not now con- 

 cerned us, it should be conceded that living Dipnoi show many 

 resemblances to the Batrachia, and not least to the Apoda. 

 This point along with other phylogenetic details will be con- 

 sidered later. The "family tree" facing this page may repre- 

 sent for us the supposed relations existing between the groups 

 studied up to the present. 



