PHYLUM PROTOZOA 



39 



the anterior half of the body, and the other lying in a 

 transverse groove which completely encircles the body ; the 



^^i 



en w 



C c v 



s. 11 



W T3C/) 



S I 



51 



I- 



1.8 



former alone acts as an organ of locomotion, the latter lies 

 habitually in the groove and performs undulating move- 



