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. 
female frog.—After Ecker. 
f4b., Fatty bodies; v.c., vena cava; ovd., Opening of oviduct ; ov., ovary ; 
T., testis; K., kidney; w.d., Wol- /.4., fatty body; X., kidney; U4, . 
ffian duct ; c/., cloaca; B., bladder. uterus; Uyv., opening of ureters into 
x cloaca (cZ.), 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 
