A. ELASMOBRANCHII 



B. HOLOCEPHALI 



C. CROSSOPTERYGII 



3j,„ ----- -■ 



D. POLYPTERINI 



E. TELEOSTEI 



F. DIPNOI 



Fig. 329. (A) Heptanchus. (B) Chimaera. (C) Osteolepis. (D) Polypterus. (E) 

 Scornberomorus, Spanish mackerel. (F) Neoceratodus, Australian lungfish. (A, D, E, 

 courtesy, Neal and Rand: "Chordate Anatomy," Philadelphia, The Blakiston 

 Company. B, courtesy, Jordan and Evermann: "Fishes of North and Middle 

 America," Washington, The Smithsonian Institution. C, F, from "Cambridge 

 Natural History," Vol. VII. By permission of The Macmillan Company, publishers.) 



426 



