80 Toil Region — True Fishes 



I. Median keel on each side of the caudal peduncle 

 Page 81, figs. A-F 



See Amber Jack, Rudderfish, Pilot Fish, Three-spined 

 Stickleback, Nine-spined Stickleback, p. 128. 



II. No median keel on each side of the caudal peduncle 

 Page 81, fig. G 



See TAIL REGION— TRUE FISHES, p. 82. 



