8 Head-~Fish~Like Vertebrates and True Fishes 



HEAD-FISH-LIKE VERTEBRATES AND 

 TRUE FISHES 



I. Numerous (5-7) gill openings on each side of head 

 Page 9, figs. A-C 



See Lampreys, Sharks, Rays, p. 10. 



n. One gill opening on each side of head 

 Page 9, figs. D, E 



See HEAD— TRUE FISHES, p. 52. 



