200 



PROTOZOOLOGY 



Fig. 94. a, Stephanoon askenasii, X4'40 (Schewiakoff) ; b, Platij- 

 dorina caudata, X280 (Kofoid); c, Sipondylomorum quaternnrium, 

 X330 (Stein); d, Chlamydobotrys stellata, X430 (Korschikoff); e, Ste- 

 phanosphaera pluvialis, x250 (Hieronymus); f, Pandorina morum, 

 XBOO (Smith); g, Mastigosphaera gobii, X520 (Schewiakoff); h, Eu- 

 dorina elegans, X310 (Goebel); i, Pleodorina illinoisensis, X200 (Ko- 

 foid). 



arranged in 2 rings; individuals 14-15/i long; colony 30-40// in 

 diameter; Maryland (Bold, 1933). 



Genus Stephanosphaera Cohn. Spherical or subspherical 

 colony, with 8 (rarely 4 or 16) cells arranged in a ring; cells pyri- 

 form, but with several processes; 2 flagella on one face; asexual 

 reproduction and isogamy (p. 146); fresh water. 



S. pluvialis C. (Figs. 70; 94, e). Cells 7-13yu long; colony 30-60m 

 in diameter. 



