G62 



PROTOZOOLOGY 



of development, there are 2 uninucleate bodies surrounded by a bi- 

 nucleate envelope; 2 inner cells multiply into 16 cells which unite in 

 pairs; nucleus of zygote of sporont divides first into 2; 1 of the nu- 

 clei divides into 6 which form 3 shell-valves and 3 polar capsules, 

 while the other nucleus together with a portion of cytoplasm remains 



Fig. 286. a, Tetractinomyxon intermedium, X800 (Ikeda) b,; Sphae- 

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

 (Granata); d, Triactinomyxon ignotum, X165 (L6ger); e, Hexactinomyxon 

 psammoryctis, X300 (Stole); f, g, Synactinomyxon tubificis, X600 (Stole); 

 h, N eoactinomyxum globosum, XS60 (Granata); i, Cuyenotia sphaerulosa, 

 X2095 (Naville). 



outside the envelope, and undergoes multiplication; 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 development. 



S. stolci C. and M. (Fig. 286, b). Spore spherical; in Clitellis are- 

 narius and Hemitubifex benedii. 



