REPRODUCTIVE SYSTEM. 



597 



streak, the adrenal gland, and little spots mark ciliated 

 apertures or nephrostomes, which remain as communica- 

 tions between the abdominal cavity and the renal veins, 

 though they are originally connected with the urinary 

 tubules. There are also, as in higher Vertebrates, open- 

 ings from the abdominal cavity into the lymphatic system. 



FIG. 322. Urogenital system of FIG. 323. Urogenital system 01 



male edible frog. After Ecker. female frog. After Ecker. 

 f.b.y Fatty bodies; v.c., vena cava ; ovd, y Opening of oviduct ; ov., ovary ; 



T., testis; K., kidney; -w.d., Wol- 

 ffian duct ; cl., cloaca; Bl., bladder. 



, y ., 



.., fatty body; K., kidney; Ut. t 

 uterus ; Ur.^ open ing of ureters into 

 cloaca (c/.)> in front of the openings 

 of the oviducts. 



Reproductive system. The males are distinguishable 

 from the females by the swollen cushions on the first fingers. 

 At the breeding season in spring, they trumpet to their 

 mates. The male clasps the female with his fore-limbs, 

 and retains his hold for several days, fertilising the ova as 

 they pass out into the water. 



The paired testes are oval yellowish bodies lying in front 

 of the kidneys ; the spermatozoa pass by vasa efferentia 



