PHYLUM PROTOZOA 



35 



The body of Euglena (£, H) is spindle-shaped, and has 

 at the blunt anterior end a depression, the gullet (F. ces), 

 from the inner surface of which springs a single long flagellum 

 {fl). The organism is propelled through the water by the 



lashing movements of the flagellum, which is always directed 

 forwards ; it can also perform slow, worm-like movements of 

 contraction and expansion {A — D), but anything like the 



