14 Sharks 



THRESHER, GREENLAND, OTHER SHARKS 



I. Tail long; about same length as body 

 Page 15, fig. A 



See Common Thresher Shark, p. 235. 



II. Tail shorter; length much less than that of body 

 Page 15, figs. B-D 



Ila. Lower surface of body with only one pair of fins, 

 pelvics; anal fin absent 

 Page 15, figs. B, C 



1. A spine in front of each dorsal fin 

 Page 15, fig. B 



See Dogfishes, p. 32. 



2. No spine in front of dorsal fins 

 Page 15, fig. C 



See Greenland Shark, p. 251. 



lib. Lower surface of body with both pelvic fins and 

 anal fin present 

 Page 15, fig. D 



See Basking, Tiger, Mackerel, White, Other 

 Sharks, p. 16. 



