SPOROZOA, GREGARINIDA 



461 



50-60^ by 23-26m; with paraglycogen grains; schizogony produces 

 30-38 merozoites; in gut of larvae of Culex pipiens. 



Genus Lipotropha Keilin. Schizogony and sporogony intracel- 

 lular; cyst contains 16 spores, each with 8 sporozoites; in fat body 

 of Systenus larvae. One species. 



L. macrospora K. (Fig. 214, n). Spores about 13.5/x by 3ju. 



Fig. 214. a-c, Selenidium potainillae (a, X420; b, cyst with spores, 

 X330; c, spore) (Mackinnon and Ray); d-f, Meroselenidium keilini 

 (d, sporadin, X670; e, f, different views of spore, X930) (Mackinnon 

 and Ray); g-j, Machadoella triatomae (g, a schizont, X1420; h, i, a single 

 and associated sporadins, X710; j, spore, X1920) (Reichenow); k, 1, 

 Syncystis ynirabilis: k, a cyst, X470 (Steopoe); 1, spore (Schneider); 

 m, Mattesia dispora, X1480 (Naville); n, Lipotropha macrospora, X800 

 (Keilin). 



Genus Selenidium Giard. Schizogony intracellular; many spores 

 produced by a pair of extracellular gametocytes; spore with 4 or 

 more sporozoites; in gut of annelids. 



S. potamillae Mackinnon and Ray (Fig. 214, a-c). Trophozoites 

 euglenoid, average size 40ai by 15/i; longitudinal striae; cysts ob- 

 long, producing many spores; spore, spherical with 4 (up to 10) 

 sporozoites; in gut of the polychaete, Poiamilla reniformis. 



