SUB-CLASS: ZOOMASTIGINA 



279 



white ants, and which have a very complex structure and large numbers 

 of flagella ; and the Cystoflagellata, marine flagellates of peculiar organiza- 



Fig. 129. — Portion of a Spherical Colony of Volvox globator, in which Sexually 

 Differentiated Gametes have developed ( x ca. 1,000). (From Lang, 



1901, after CiENKOWSKY and BiJTSCHLI.) 



S, Male gametes; 0, female gametes. 



Fig. 130. — Chlamydomonas angulosa (l-i) and C. longisUgma (5-8), showing Method 



OF Multiplication ( x ca. 1,000). (From Oltmann, 1922, after Dill.) 



a. Stigma; chr, chromatophores; g, flagella; k\ nucleus; pi/, pyrenoids; v, contractile vacuole. 



tion. Doflein separates from the Polymastigina, in the order Distoma- 

 tina, certain flagellates {Hexamita, Giardia) which have a bilateral 

 symmetry associated with the presence of two nuclei and two sets of 



