2 PROTOZOA. 



Subclass 4. Amoebsea. 



Simple amoeboid forms, typically with lobose 

 pseudopodia; with or without a simple test. 

 (Amoeba, Arcella, Difflugia.) 

 Subphylum 2. Mastigophora. 



Locomotor organs of adult phases consist of one 

 or more vibratile lash-like appendages or 

 flagella. 

 Class 1. Phytomastigoda. 



Flagellates colored by chlorophyll and their 

 colorless relatives; vacuoles simple or com- 

 plex. 



Order 1. Chrysomonadida. 



With yellow-brown chromatophores; flagella 1 

 or 2 in number, inserted apically; pseudopodia 

 often formed; no gullet. (Synura, Uroglena, 

 Dinobryon.) 



Order 2. Cryptomonadida. 



Typically small, with constant body form; 

 laterally compressed; flagella 1 or 2 in number; 

 with gullet. Colorless or with varicolored 

 chromatophores. (Chilomonas, Cryptomonas.) 



Order 3. Dinoflagellida. 



Usually with cellulose shell; 2 flagella, one of 

 which encircles the shell. (Glenodinium, Am- 

 phidinium, Ceratium, Noctiluca, Polykrikos.) 



Order 4. Phytomonadida. 



Holophytic forms with cellulose membrane. 

 Colony formation common. (Sphserella, Pan- 

 dorina, Volvox.) 



Order 5. Euglenida. 



Typically large complex forms with one prin- 

 cipal flagellum, mouth aperture and vacuole 

 system. Frequently provided with stigma and 

 chlorophyll apparatus for holophytic nutrition. 

 (Euglena, Peranema, Phacus.) 



Order 6. Chloromonadida. 



Rare forms with discoidal, grass-green chroma- 

 tophores. 

 Class 2. Zoomastigoda. 



Animal flagellates with no chromatophores or 

 chlorophyll. Similar in other general aspects to 

 the Phytomastigoda, 



