SPOROZOA, GREGARINIDA 

 c 



411 



Fig. 186. a-e, Ophryocystis mesnili (a, trophozoite attached to Mal- 

 pighian tubule; b-e, sporogony), X1330 (L6ger); f, g, Merogregarina 

 amaroucii, XlOOO (Porter); h, i, Spirocystis nidula (h, X770; i, X500) 

 (L^ger and Duboscq); j, k, CauUeryeUa pipientis (j, gut of Culex 

 pipiens with trophozoites, x200; k, a spore, X1200) (Buschkiel). 



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

 long; spore about 14/x long. 



Genus Spirocystis Leger et Duboscq. Schizogony intracellular; 

 schizonts curved, one end highly narrowed; mature schizonts 

 snail-like, with numerous nuclei; repeated schizogony (?) ; gametes 

 in chloragogen cells, somatic and visceral peritonium; association 

 of 2 gametes produces a spore. One species. 



S. nidula L. et D. (Fig. 186, h, i). In coelom and gut epithelium 

 of Lumhricus variegatus; multinucleate schizonts about 35m long; 

 microgametes fusiform or ovoid, 7m by 3m; macrogametes ovoid 

 or spherical, 11m in diameter; fusion of 2 gametes produces one 

 spore which is thick-walled, 35m long and contains one sporozoite, 

 up to 40m long. 



Family 2 Schizocystidae Leger et Duboscq 



Two or more spores are produced in a pair of gametocytes. 



Genus Schizocystis Leger. Mature trophozoite multinucleate; 

 ovoid or cyhndrical with differentiated anterior end; schizogony 

 by multiple division; trophozoites become associated, encyst, and 



