444 



BIOLOGY OF THE PROTOZOA 



division. Each individual or aggregate of individuals may encyst 

 to form permanent spore-like resting stages. Flagellated spores are 

 unknown (see Valkanov, 1929). 



Family 2. Zobsporidae Zopf-Delage.— These forms are also endo- 

 parasitic in diatoms, algae and various Protozoa, and have filose, 

 Heliozoa-like pseudopodia without axial filaments. They are dis- 

 tinguished by the formation of swarm spores. Protomonas amyli 

 Cienkowsky apparently lives only on starch grains. Typical 

 genera: Pseudospora Cienkowsky, Protomonas Cienkowsky and 

 Protomyxa Haeckel. 



Fig. 183. — Nuclcaria delicatula, quiescent and moving forms. (From Calkins.) 



Family 3. Vampyrellidae Doflein.— Here also the pseudopodia 

 are very delicate and frequently branch and anastomose and may 

 proceed from all sides of the body or be limited in origin to certain 

 regions. They are frequently parasitic on algae and Protozoa, some 

 forms having the ability to dissolve the cellulose membranes of 

 plant cells, thus making holes through which the protoplast passes 

 into the body of the parasite (e. g., Vampyrella; see Lloyd, 1929) 

 or they may enter the plant cells. Products of chlorophyll nutrition 

 frequently form reddish-colored masses (karotin) in their proto- 



