552 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



t 



Figure 11.— Internal anatomy of normal, sexually mature, male stickleback showing presence of ovaries, c- cloaca; 

 g = gut; k = kidney; o = ovary; sc = sac; sp = spleen; st = stomach; t = testis. 



Figure 12.-Internal anatomy of normal, ripe, female stickleback showing presence of testes, c-cloaca; g-gut; 



k = kidney; o = ovary; sp = spleen; st = stomach; t — testis. 



