PHYLUM PROTOZOA 



57 



into a number of somewhat sickle-shaped bodies, which are 

 arranged within the spore-coat somewhat like a bundle of 

 sausages. By rupture of the spore-coat these falciform 

 young, as they are termed, are liberated, and at once begin 



active movements, the thin end of the body moving to and 

 fro like a clumsy flagellum. They enter the clumps of devel- 

 oping sperms of the earthworm, and afterwards escape into 

 the cavity of the seminal vesicle and grow into the adult form. 



