20 Sharks 



NURSE SHARK, CHAIN DOGFISH, DEEP-WATER 

 CAT SHARK, OTHER SHARKS 



I. Origin of first dorsal fin over or behind origin of pelvic 

 fin 

 Page 21, figs. A-C 



la. Origin of first dorsal fin directly over origin of 

 pelvic fin 

 Page 21, fig. A 



See Nurse Shark, p. 236. 



lb. Origin of first dorsal fin well behind origin of 

 pelvic fin 

 Page 21, figs. B, C 



1. Irregular chain-like markings on sides of body 

 Page 21, fig. B 



See Chain Dogfish, p. 238. 



2. No chain-Hke markings on sides of body 

 Page 21, fig. C 



See Deep-Water Cat Shark, p. 238. 



II. Origin of first dorsal fin well in front of origin of pelvic 

 fin 

 Page 21, figs. D, E 



See Sand Shark, Smooth Dogfish, Other Sharks, p. 22. 



