148 



SEX IN MICROORGANISMS 



(7 to 12); and Spirovwnas angiistata; with some evidence for Hetero- 

 inita globosa (Woodcock, 1916); and ProwazekeJh lacertae (24-28) 

 (Wenyon, 1920). Woodcock (1916) also described fusion of indi- 

 viduals of Spiromorias angiistata within a cyst (13 to 18), and Ale- 

 xeieff (1925) described fusion of active flagellates of Alphay/wnas sp. 



Fig. E. Cell fusion in protomonad flagellates, all redrawn. 



1-4, fusion of vegetative cells. 5, 6, encystment of zygote, of Helkeshnastix faecicola, 

 from Woodcock and Lapage (1915). 7-12, cell fusion followed by encystment of 

 zygote of Cercomofias longicauda, from Woodcock (1916). 13-18, fusion of cells 

 after encystment of Spiroino7ias angiistata, from Woodcock (1916). 19, 20, vegeta- 

 tive cells. 21-23, fusion of cells of Alphavionas sp. (? — Spironionas angustata) from 

 Alexeieff (1925). 24-28, cell fusion and encystment of Proivazekella ( = Proteromonas) 

 lacertae, from Wenyon (1920). 



