34 Sharks 



TIGER, MACKEREL, WHITE SHARKS 



I. Upper lobe of tail much more than twice length of 

 lower lobe 

 Page 35, fig. A 



See Tiger Shark, p. 240. 



II. Upper lobe of tail less than twice length of lower lobe 

 Page 35, figs. B-D 



Ila. Caudal peduncle with a second keel below and to 

 the rear of main keel 

 Page 35, fig. B 



See Mackerel Shark, p. 232. 



lib. Caudal peduncle with only one keel 

 Page 35, figs. C, D 



1. Front margin of first dorsal fin longer than 

 depth of head at first gill slit 



Page 35, fig. C 



See Sharp-nosed Mackerel Shark, p. 233. 



2. Front margin of first dorsal fin about equal to 

 depth of head at first gill slit 



Page 35, fig. D 



See White Shark, p. 234. 



