208 



BRANCH CHORDATA 

 SUB-CLASS III. DIP'nOI 



The "lung fishes" are snake-hke or eel-Hke (Fig. 168), and 

 bear small, soft, cycloid scales, small paired fins, and a diphycer- 



Fig. 168. — Lung fish {Protop'lerus annecferis). (Boas.) 



Fig. 159. — The Ccr'atoilus of (^ufciishunl, :in air-breathing and water- 

 breathing mudfish of the ancient type, with paddle fins. (P>om Baskett, 

 " The Story of the Fishes," D. Appleton and Co., Publishers.) 



cal caudal fin. The skeleton is largely cartilage and the noto- 

 chord persistent. They live in fresh water, and usually breathe 



