SPOROZOA, GREGARINIDA 



561 



Fig. 239. The life-cycle of Schizocystis gregarinoides, X1000 (Leger). 

 a, germinating spore; b, growth of schizonts; c, schizogony; d, two 

 gametocytes and their association; e, stages in gamete formation, f, 

 zygote formation, g, cyst containing zygotes, each of which develops into 

 a spore shown in a. 



cytes; spore with 8 sporozoites; in Malpighian tubules of Coleop- 

 tera. Several species. 



0. mesnili Leger (Fig. 240, a-e). In Tenebrio molitor; schizonts 

 1-4 nuclei; gametocytes llju in diameter; pairs 16-17^ by 11/x; 

 spores biconical, llju by 7/z. 



Genus Merogregarina Porter. Schizogony intracellular; tropho- 

 zoites attached to gut epithelium by a proboscidiform organel- 

 la; 2 gametocytes giving rise to one spore containing 8 sporozoites. 



M. amaroucii P. (Fig. 240, /, g). In gut of the ascidian, Ama- 

 roucium sp.; extracellular; trophozoites with epimerite, 27-31yu 

 long; spore about 14/x long. 



