470 



PROTOZOOLOGY 



by a binucleate envelope; 2 inner cells multiply into 16 cells which 

 unite in pairs; nucleus of zygote or sporont divides first into 2; 1 

 of the nuclei divides into 6 which form 3 shell-valves and 3 polar 

 capsules, while the other nucleus together with a portion of cyto- 



FiG. 217. a, Tetractinomyxon intermedium, X800 (Ikeda); b, Sphae- 

 ractinomyxon stolci, X600 (Caullery and Mesnil); c, S. gigas, X665 

 (Granata); d, Triactinomyxon ignolum, Xl65 (Leger); e, Hexaclino- 

 myxon psammoryctis, X300 (Stole); f, g, Synactinomyxon tubificis, 

 X600 (Stole); h, Neoactinomyxum globosum, X860 (Granata); i, Guy- 

 enotia sphaerulosa, X2095 (Naville). 



plasm remains outside the envelope, and undergoes multiplica- 

 tion; multinucleate sporoplasm migrates into spore; sporoplasm 

 later divides into a large number of uninucleate sporoplasms 

 which, when spores gain entrance into a new host, begin develop- 

 ment. 



