282 



PROTOZOOLOGY 



C. cordiformis (Carter) (Fig. 114, a). Heart-shaped in front view; 

 ovoid in profile; chromatophore large; 18-23/x by 16-20/t. 



C. ellipsoidalis Bold. Ellipsoid; chromatophore; a small stigma; 

 division into 2, 4, or 8 individuals in encysted stage; 6-24/x long; 

 fresh water, Maryland (Bold, 1938). 



Genus Pyramimonas Schmarda (Pyramidomonas Stein). Small 

 pyramidal or heart-shaped body; with bluntly drawn-out posterior 

 end; usually 4 ridges in anterior region; 4 flagella; green chromato- 

 phore cup-shaped; with or without stigma; a large pyrenoid in the 

 posterior part; 2 contractile vacuoles in the anterior portion ;'encyst- 

 ment; fresh water. Several species (Geitler, 1925). 



P. tetrarhynchus S. (Fig. 114, b). 20-28/* by 12-18/*; fresh water; 

 Wisconsin (Smith, 1933). 



Fig. 114. a, Carteria cordiformis, X600 (Dill); b, Pyramimonas tetra- 

 rhynchus, X400 (Dill); c, d, Polytomella agilis, X1000 (Doflein) (d, a 

 cyst) ; e, Spirogonium chlorogonioides, X 670 (Pascher) ; /, Tetrablepharis 

 7nultifilis, X670 (Pascher); g, Spermatozopsis exultans, XI 630 (Pascher); 

 h, Chloraster gyrans, X670 (Stein); i, Polyblepharides singularis, X870 

 (Dangeard); j, k, Pocillomonas flos aquae, X920 (Steinecke); 1, m, Phaco- 

 tus lenticularis, X430 (Stein); nj Pteromonas angulosa, X670 (West); o, p, 

 Dysmorphococcus variabilis, X1000 (Bold). 



