PHYLUM PROTOZOA 



39 



ceedingly delicate and transparent, called the collar. This 

 is contractile, and, though its precise functions are not yet 



C ,/0 -s 



c, 

 o 



Q. 



O- 



o 

 >1 



Q- 



w 



.§JB 



P-.H 



^ 





CO 





certainly known, there is evidence to show that its move- 

 ments cause a flow of water, with minute particles in sus- 

 pension, up the outside of the collar and down the inside, 



