SPOROZOA. GREGARINIDA 



459 



Family 1 Ophryocystidae L^ger and Duboscq 

 Two gametocytes produce one spore; in Malpighian tubules of 

 Coleoptera, gut of Aseidia and coelom of Oligochaeta. 



Genus Ophryocystis Schneider. Schizogony by binary or mul- 

 tiple division; extracellular; schizonts conical, attached to host 

 cells by pseudopods; a single spore in a pair of spheroidal gameto- 

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

 tera. Several species, 



0. mesnili Leger (Fig. 213, a-e). In Tenebrio molitor; schizonts 

 1-4 nuclei; gametocytes 11/x in diameter; pairs 16-17)u by ll/x; 

 spores biconical, 1 1)U by T/x, 



Fig. 213. a-e, Ophryocystis mesnili (a, trophozoite attached to Mal- 

 pighian tubule; b-e, sporogony), X1330 (L^ger); f, g, Merogregarina 

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

 (L6ger and Duboscq); j, k, Caulleryella pipientis (j, gut of Culex pipiens 

 with trophozoites, X 200 ; k, a spore, X1200) (Buschkiel). 



Genus Merogregarina Porter. Schizogony intracellular; tropho- 

 zoites attached to gut epithelium by a proboscidiform organel- 

 la; resembles somewhat Selenidium, but 2 gametocytes giving 

 rise to one spore containing 8 sporozoites. 



M. amaroucii P. (Fig. 213, /, g). In gut of the ascidian, Ama- 

 roucium sp.; extracellular; trophozoites with epimerite, 27-3lAt 

 long; spore about 14/i long. 



Genus Spirocystis Leger and Duboscq. Schizogony intracellular; 

 schizonts curved, one end highly narrowed; mature schizonts 



