PHYTOMONADINA 



289 



Genus Stephanosphaera Cohn. Spherical or subspherical colony, 

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

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

 and isogamy (p. 183) ; fresh water. 



Fig. 117. a, Stephanoon askenasii, X440 (Schewiakoff); b, Platydorina 

 caudata, X2S0 (Kofoid); c, Spondylomorum quaternarium, X330 (Stein); 

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

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

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

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



S. pluvialis C. (Figs. 80; 117, e). Cells 7-13m long; colony 30-60/x 

 in diameter. Culture and sexuality (Schulze, 1927). 



Genus Pandorina Bory. Spherical or subspherical colony of usu- 

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

 within a gelatinous, but firm and thick matrix; individuals often 

 angular; with stigma and chromatophores; asexual reproduction 



