192 True Fishes 



STICKLEBACKS 



I. Seven or more dorsal spines 

 Page 193, fig. A 



See Nine-spined Stickleback, p. 338. 



II. Less than seven dorsal spines 

 Page 193, figs. B, D, F 



Ila. Bony ridge on each side of belly. Sides without 

 plates 

 Page 193, fig. B 



See Four-spined Stickleback, p. 336. 



lib. No bony ridge on each side of belly. Sides usually 

 have plates 

 Page 193, figs. D, F 



1. A strong cusp at the base of each pelvic spine 

 Page 193, figs. C, D 



See Two-spined Stickleback, p. 338. 



2. No strong cusp at the base of each pelvic spine 

 Page 193, figs. E, F 



See Three-spined Stickleback, p. 337. 



