SARCODINA, PROTEOMYXA 333 



contractile vacuoles; feeds on diatoms and other microorganisms. 



A. impatiens C. (Fig. 155, a). 40-350m in diameter. 



Genus Chlamydomy^xa 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. 155, h, 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-con- 

 tractile vacuoles at bases of grouped pseudopods; in active individ- 

 ual there is a constant movement of minute fusiform bodies 

 (function?); when extended 100-150/i long; total length 300^ 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. 155, d). Contracted form 0.5-1 mm. in diameter; 

 with 1-3 nuclei; pseudopodia 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; 

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

 body surface and pseudopodia. 



C. viridis G. Average diameter 35-45yu; 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. 155, 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 35-40m, or up 

 to 80/z or more; pseudopodia 400^ long or longer. Cienkowski main- 

 tained that this was a moneran. 



Genus Penardia Cash. When inactive, rounded or ovoid; at other 

 times expanded; exceedingly mobile during progression; endoplasm 

 chlorophyll-green with a pale marginal zone; filopodia, branching 



