PHYLUM PROTOZOA 



c.-vac 



2.Nuclean'a 



3-Clahhr-uJina 



FIG. 8. Various forms of Heliozoa. ja, the entire animal; 36, the flagellula; 

 c. vac, contractile vacuole; ^gelatinous investment; nit, nucleus; psd, pseudo- 

 pods; sk, siliceous skeleton; sp, spicules. (From Biitschli's Protozoa, after 

 Schulze and Greeff.) 



