292 PROTOZOOLOGY 



except hyaline ectoplasm; feeds on Spirogyra and other algae 

 in fresh water. On coming in contact with an alga, it often travels 

 along it and sometimes breaks it at joints, or pierces individual 

 cell and extracts chlorophyll bodies by means of pseudopodia; 

 multiplication in encysted condition; 30-40^ in diameter. 



Genus Nuclearia Cienkowski. Subspherical, with sharply 

 pointed fine radiating pseudopodia; actively moving forms 

 vary in shape; with or without a mucous envelope; with one or 

 many nuclei; fresh water. 



A^. delicatula C. (Fig. 133, m, n). Multinucleate; bacteria often 

 adhering to gelatinous envelope ; up to 60ju in diameter. 



N . simplex C. Uninucleate; 30;u in diameter. 



Genus Arachnula Cienkowski. Body irregularly chain-form 

 with filopodia extending from ends of branches; numerous nuclei 

 and contractile vacuoles; feeds on diatoms and other micro- 

 organisms. 



A. impatiens C. (Fig. 134, a). 40-350/i in diameter. 



Genus Chlamydomyxa Archer. Body spheroidal ; ectoplasm and 

 endoplasm well differentiated ; endoplasm often green-colored due 

 to the presence of green spherules; numerous vesicular nuclei; 

 1-2 contractile vacuoles; secretion of an envelope around the body 

 is followed by multiplication into numerous secondary cysts; 

 cyst wall cellulose; in sphagnum swamp. 



C. montana Lankester (Fig. 134, 6, c). Rounded or ovoid; cyto- 

 plasm colored; about 50/x in diameter; when moving, elongate 

 with extremely fine pseudopodia which are straight or slightly 

 curved and which are capable of movement from side to side; 

 non-contractile vacuoles at bases of grouped pseudopods; in 

 active individual there is a constant movement of minute fusi- 

 form bodies (function?); when extended 100-150/x long; total 

 length 300)U or more; fresh water among vegetation. 



Genus Rhizoplasma Verworn. Spherical or sausage-shaped; 

 with anastomosing filopodia; orange-red; with a few nuclei. 



R. haiseri V. (Fig. 134, d). Contracted form 0.5-1 mm. in 

 diameter; with 1-3 nuclei; pseudopodia up to 3 cm. long; ex- 

 tended body up to 10 mm. long; originally described from Red 

 Sea. 



Genus Chondropus Greeff. Spherical to oval; peripheral portion 

 transparent but often yellowish; endoplasm filled with green, 

 yellow, brown bodies; neither nucleus nor contractile vacuoles 



