294 PROTOZOOLOGY 



observed; pseudopods straight, fine, often branched; small pearl- 

 like bodies on body surface and pseudopodia. 



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

 algae. 



Genus Biomyxa Leidy {Gymno'phrys Cienkowski). Body form 

 inconstant; initial form spherical; cytoplasm colorless, finely 

 granulated, capable of expanding and extending in any direction, 

 and of projecting filopodia which freely branch and anastomose; 

 cytoplasmic movement active throughout; numerous small con- 

 tractile vacuoles in body and pseudopodia; with one or more 

 nuclei. 



B. vagans L. (Fig. 134, e). Main part, of various forms; size 

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



B. cometa (C.). Subspherical or irregularly elHpsoidal; pseudo- 

 podia small in number, formed from 2 or more points; body 35- 

 40m, or up to 80m or more; pseudopodia 400m long or longer. 

 Cienkowski maintained 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 and anastomosing, colorless; nucleus inconspicuous; 

 one or more contractile vacuoles, small; fresh water. 



P. mutabilis C. (Fig. 134,/). Resting form 90-100m in diameter; 

 extended forms (including Pseudopodia) 300-400m long. 



Genus Hyalodiscus Hertwig et Lesser. Discoid, though outhne 

 varies; endoplasm reddish, often vacuolated and sometimes shows 

 filamentous projections reaching body surface; a single nucleus; 

 ectoplasmic band of varying width surrounds the body com- 

 pletely; closely allied to Vampyrella; fresh w^ater. 



H. ruhicundus H. et L. (Fig. 134, g). 50-80m by about 30m; 

 polymorphic; when its progress during movement is interrupted 

 by an object, the body doubles back upon itself, and will move 

 on in some other direction; freshwater ponds among surface 

 vegetation. 



References 



Calkins, G. N. 1926; 1933 The biologij of the Protozoa. Phila- 

 delphia. 



DoFLEiN, F. and E. Reichenow 1929 Lehrhuch der Protozoen- 

 kunde. Jena. 



KtJHN, A. 1926 Morphologie der Tiere in Bildern. H. 2; T. 2. 

 Rhizopoden. 



