260 



PRINCIPLES OF ANIMAL BIOLOGY 



into them. This is characteristic of the class to which Amoeba (Fig. 

 212) belongs. Protozoa of this type have no constant characteristic 

 form but are always changing. Others have at one end of the cell one 

 or two long whiplike flagella whose lashing or sometimes wavelike motion 

 propels the organism through the water. Euglena (Fig. 213) is one of 

 these. Still others have the body covered by hundreds of cilia, short 



Fig. 212. — Amoeba. 



Fig. 213. 

 Euglena. 



Fig. 214.— 

 Paramecium. 



Fig. 215. — Podophrya, 

 one of the Suctoria. 



hairlike projections whose beating drives the body along, as in Para- 

 mecium (Fig. 214). Some protozoa, particularly the parasitic ones, have 

 no locomotor structures. The classification of protozoa follows. 



SUBPHYLUM I. Plasmodroma. Protozoa that never have cilia in any stage. 



Class I. Mastigophora. Protozoa with flagella, which serve for locomotion 

 or for taking food. Euglena. (Figs. 34, 47, 48, 50, 51, 52, 53, 54, 129, 130, 131, 213.) 



Subclass I. Phytomastigina 

 Order 1. Chrysomonadina 

 Order 2. Cryptomonadina 

 Order 3. Dinoflagellata 

 Order 4. Eiiglenoidina 

 Order 5. Phytomonadina 



Subclass II. Zoomastigina 

 Order 1. Protomonadina 

 Order 2. Polymastigina 

 Order 3. Hypermastigina 

 Order 4. Distomatina 

 Order 5. Cystoflagellata 



Class II. Rhizopoda. Protozoa with pseudopodia or other changeable processes. 

 Amoeba. (Figs. IG, 30, 43, 49, 212.) 



Class III. Sporozoa. Parasitic; Protozoa, usually without motile organs or 

 mouth, reproducing by spores. Malarial organism. 



Subclass I. Telosporidia 

 Order 1. Coccidiomorpha 

 Order 2. Gregarinida 



Subclass IT. Neosporidia 

 Order 1. Cnidosporidia 

 Order 2. Sitrcosporidia 

 Order 3. Haplosporidia 



