PHYTOMONADINA 



229 



C. stellata K. (Fig. 100, d). Colony composed of 8 individuals 

 arranged in 2 rings; individuals 14-15^ long; colony 30-40m in 

 diameter; Maryland (Bold, 1933). 



Genus Stephanosphaera Cohn. Spherical or subspherical colony, 

 with 8 (rarely 4 or 16) cells arranged in a ring; cells pyriform, but 



Fig. 100. a, Stephanoon askenasii, X440 (Schewiakoff) ; b, Platydorina 

 caudata, X280 (Kofoid); c, Spondylomorum qiiaternarium, X330 (Stein); 

 d, Chlamydobotrys stellata, X430 (Korschikoff); e, Stephanosphaera plu- 

 vialis, X250 (Hieronymus); f, Pandorina niorum, X300 (Smith); g, 

 Mastigosphaera gobii, X520 (Schewiakoff); h, Eiidorina elegans, X310 

 (Goebel); i, Pleodorina illinoisensis, X200 (Kofoid). 



with several processes; 2 flagella on one face; asexual reproduction 

 and isogamy (p. 152) ; fresh water. 



S. pluvialis C. (Figs. 74; 100, e). Cells 7-13m long; colony 30-60/i 

 in diameter. 



Genus Pandorina Bory. Spherical or subspherical colony of usu- 

 ally 16 (sometimes 8 or 32) biflagellate individuals, closely packed 



