422 PROTOZOOLOGY 



N. delicatula C. (Fig. 176, m, n). Multinucleate; bacteria often 

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



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



Genus Arachnula Cienkowski. Body irregularly chain-form with 

 filo podia extending from ends of branches; numerous nuclei and 

 contractile vacuoles; feeds on diatoms and other microorganisms. 



A. impatiens C. (Fig. 177, a). 40-35Gy 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. 177, b, c). Rounded or ovoid; cyto- 

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

 extremely fine pseudo podia which are straight or slightly curved 

 and which are capable of movement from side to side; non-con- 

 tractile vacuoles at bases of grouped pseudo pods; in active individ- 

 ual there is a constant movement of minute fusiform bodies 

 (function?); when extended 100-150^ long; total length 300/x or 

 more; fresh water among vegetation. 



Genus Rhizoplasma Verworn. Spherical or sausage-shaped; with 

 anastomosing filo podia; orange-red; with a few nuclei. 



R. kaiseri V. (Fig. 177, d). Contracted form 0.5-1 mm. in diameter; 

 with 1-3 nuclei; pseudo podia up to 3 cm. long; extended 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 observed; 

 pseudo pods straight, fine, often branched; small pearl-like bodies on 

 body surface and pseudopodia. 



C. viridis G. Average diameter 35-45^; fresh water among algae. 



Genus Biomyxa Leidy (Gymnophrys Cienkowski). Body form in- 

 constant; initial form spherical; cytoplasm colorless, finely granu- 

 lated, capable of expanding and extending in any direction, with 

 many filopodia which freely branch and anastomose; cytoplasmic 

 movement active throughout; numerous small contractile vacuoles 

 in body and pseudopodia; with one or more nuclei. 



B. vagans L. (Fig. 177, e). Main part of body, of various forms; 

 size varies greatly; in sphagnous swamps, bog-water, etc. 



B. cometa (C). Subspherical or irregularly ellipsoidal; pseudopodia 

 small in number, formed from 2 or more points; body 35-40/z, or up 



