The Tetrapoda: Amphibia, Reptiles, Birds 591 



Subclass II. Choanichthyes. 



Order 1. Crossopterygii. Example: living crossopterygian found ofif coast 



of South Africa, Latimeria chaliimnae. 

 Order 2. Dipnoi. Examples : lungfishes, Protopterns annectens of Central 



Africa ; Lepidosiren paradoxa of South America. 



