PHYTOMONADINA 



223 



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

 the posterior part; contractile vacuoles in the anterior portion; fresh 

 water. Several species. 



P. tetrarhynchus S. (Fig. 98, h). 20-28^ by 12-18^; fresh water; 

 Wisconsin (Smith, 1933). 



P. montana Geitler. Bluntly conical; anterior end 4-lobed or 

 truncate ; posterior end narrowly rounded ; plastic ; pyrif orm nucleus 



Fig. 98. a, Carteria cordiformis, X600 (Dill); b, Pyraviimonas tetra- 

 rhynchus, X400 (Dill); c, d, Polyiomella agilis, XlOOO (Doflein); e, 

 Spirogonium chlorogonioides, X670 (Pascher); f, Tetrablepharis multifilis, 

 X670 (Pascher); g, Spermatozopsis exultans, X1630 (Pascher); h, Chlo- 

 r aster gyrans, X670 (Stein); i, Polyhlepharides singularis, X870 (Dan- 

 geard); j, k, Pocillomonas flos aquae, X920 (Steinecke); 1, m, Phacotus 

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

 Dysmorphococcus variabilis, XlOOO (Bold). 



anterior, closely associated with 4 flagella; stigma; 2 contractile 

 vacuoles anterior; chromatophore cup-shaped, granular, with scat- 

 tered starch grains and oil droplets; a pyrenoid with a ring of small 

 starch grains; 17-22.5m long (Geitler); 12-20m by 8-16m (Bold); 

 flagella about body length; fresh water, Maryland (Bold, 1938). 



