206 
Excretory System in Digenea 
Fig. 1. Cercaria pekinensis, entire 
worm, dorsal view, showing di¬ 
gestive tract, genital cell masses 
and the excretory system. 
Figs. 2-4. Successive stages in the 
development of the excretory 
system in C. pekinensis. 
Fig. 5. The sporocyst of C. pekinen 
sis, showing excretory system. 
