460 PROTOZOOLOGY 



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. and D. (Fig. 213, h, i). In coelom and gut epithelium 

 of Lumbricus variegatus; multinucleate schizont about 35)U long; 

 microgametes fusiform or ovoid, 7/i by B^i; macrogametes ovoid 

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

 spore which is thick-walled, 35^1 long and contains one sporozoite, 

 up to 40m long. 



Family 2 Schizocystidae Leger and Duboscq 



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



Genus Schizocystis Leger. Mature trophozoite multinucleate; 

 ovoid or cylindrical with differentiated anterior end; schizogony 

 by multiple division; trophozoites become associated, encyst, and 

 produce numerous (up to 30) spores, each with 8 sporozoites; in 

 Diptera, Annelida, and Sipunculoida. 



S. gregarinoides L. (Fig. 212). In gut of larvae of Ceratopogon 

 solstitialis; mature schizonts up to 400iU by IS/x; curved or spirally 

 coiled; gametocytes 30-50^ long; cysts ovoid, 16-32^ long; spores 

 biconical, 8/x by 4/u. 



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. 214, k, I). In coelomic fluid and fat bodies 

 of Nepa cinerea; merozoites, 7m 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. 



M. dispora N. (Fig. 214, m). In adipose tissue cells of larvae of 

 the flour moth, Ephestia kuhniella and Plodia interpunctella (pupa 

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

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

 ville); Um by 6m (maximum 13.5m by 8m) (Musgrave and Mackin- 

 non). Highly pathogenic according to Musgrave and Mackinnon. 



Genus Caulleryella Keilin. Schizogony extracellular; each game- 

 tocyte 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. 213, j, k). Average trophozoites 



