Bull. U. S. B. F., lyi;,. 



Platk XVI. 













Fig. I. — Dissection of male Gambusia, showing testis and mechanism controlline anal fin, x 7.2; AFmodified anal fin; 



HS. modfied haemal spines; /. intestine; M. muscle controlling anal iin; T. testis; VP, ventral process of abdominal 



vertebra. 

 Fig, 2. — Skeletal parts of mechanism controlling modified anal fin; AFR, anal fin ra\s; IIS, h^mal spines; IH. inter- 



hcemals; VP. ventral process of abdominal vertebra. 

 Fig. 3. — Distal portion of modified anal fin greatly enlarged. 



Fig. 



Fig. 5, 

 Fig. 6. 

 Fig. 7 

 Fig, S. 



Testis, X c 

 — Spermataphore. x 3S5. 

 — Sperraatazooo. x 3,oco. 

 —Ovary, x 4. 

 — Dissection of female Gambuna. showing ovary distended with advanced embryos, x 3.6. 



