SPOROZOA, GREGARINIDA 563 



solstitialis; mature schizonts up to 400/z by 15m; curved or spirally 

 coiled; gametocytes 30-50/z long; cysts ovoid, 16-32ju long; spores 

 biconical, S/x by 4m. 



Genus Syncystis Schneider. Schizogony and sporogony extra- 

 cellular; young trophozoites elongate, amoeboid; mature schizonts 

 more or less spheroidal, producing some 150 merozoites; cysts 

 spherical, producing about 150 spores. One species. 



S. mirabilis S. (Fig. 241, k, I). In coelomic fluid and fat bodies 

 of Nepa cinerea; merozoites, In long; cysts spherical; spores navicu- 

 lar, 3-4 spines at ends, 10m by 6m, with 8 sporozoites. 



Genus Mattesia Naville. Schizogony in the adipose tissue cell; 

 2 spores produced by a pair of gametocytes. One species. Meiosis 

 (Naville, 1930). 



M. dispora N. (Fig. 241, m). In adipose tissue cells of larvae of 

 the flour moth, Ephestia kuhniella and Plodia interpunctella (pupa 

 and adult also); schizonts 2.5-12/x long; cyst 8-12/x in diameter, 

 with 2 spores, each with 8 sporozoites; spores 14m by 7.5m (Na- 

 ville, 1938); 11m by 6m (maximum 13.5m by 8m) (Musgrave and Mac- 

 kinnon). Highly pathogenic according to Musgrave and Mackinnon. 



Genus Caulleryella Keilin. Multiplication extracellular; each 

 gametocyte gives rise to 8 gametes, a pair forming 8 zygotes or 

 spores; spore with 8 sporozoites; in gut of dipterous larvae. Several 

 species. 



C. pipientis Buschkiel (Fig. 240, j, k). Average trophozoites 

 50-60m 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. 241, n). Spores about 13.5m by 3m- 



Genus Lipocystis Grell. Schizogony and sporogony intracellular; 

 gamete formation on the surface of cytomeres; isogamy; cyst pro- 

 duces 100-200 spores, each with eight sporozoites. One species (Grell, 

 1938). 



L. polyspora G. (Fig. 242, a). Spores elongate ellipsoid, about 10m 

 by 4m; in the fat body of Panorpa communis. 



Genus Selenidium Giard. Schizogony intracellular; many spores 

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

 more sporozoites; in gut of annelids. Generic status (Mackinnon and 

 Ray, 1933). 



S. potamillae Mackinnon and Ray (Fig. 241, a-c). Trophozoites 

 euglenoid, average size 40m by 15m; longitudinal striae; cysts ob- 



