438 PROTOZOOLOGY 



D. schneideri K. (Fig. 204, d, e). In general body cavity of Peri- 

 planeta americana; young stages in gut epithelium; cysts up to 2 

 mm, in diameter; spores l-Sfx in diameter; sporozoites 16/1 long. 



Genus Lankesteria Mingazzini. Trophozoites more or less spatu- 

 late; spherical cyst formed by 2 laterally associated sporadins in 

 rotation; spores oval, with flattened ends, with 8 sporozoites; in gut 

 of tunicates, flatworms and insects. Several species. 



L. culicis (Ross) (Fig. 201). In gut and Malpighian tubules of 

 Aedes aegypti and A. albopicius; mature trophozoites about 150- 

 200/4 by 31-41/i; cysts spherical, in Malpighian tubules of host, 

 about 30/z in diameter; spores lOyu by 6/x. 



Family 8 Urosporidae Woodcock 



Coelomic parasites in various invertebrates; sporadins associative; 

 spores with unequal ends; with or without epispores of various forms, 

 with 8 sporozoites. 



Genus Urospora Schneider. Large; frequently in lengthwise asso- 

 ciation of 2 individuals of unequal sizes; spores oval, with a long 

 filamentous process at one end; in body cavity or blood vessel of 

 Tubifex, Nemertinea, Sipunculus, Synapta, and Chiridota. Several 

 species. 



U. chiridotae (Dogiel) (Fig. 204, /). In blood vessel of Chiridota 

 laevis (in Canada); paired trophozoites up to about 1 mm. long; with 

 stiff 'hairs.' 



Genus Gonospora Schneider. Trophozoites polymorphic, oval, 

 pyriform or vermiform; cysts spherical; spore with a funnel at one 

 end, rounded at the other; in gut, coelom or ova of polychaetes. 



G. minchini Goodrich and Pixell-Goodrich (Figs. 204, g-i; 205, g). 

 In coelom of Arenicola ecaudata; young trophozoites live in host 

 eggs which float in the coelomic fluid; fully grown trophozoites 

 leave eggs in which they grow up to 200/i long, and encyst together 

 in pairs; spores without well-developed funnel, 8-10/i long. 



Genus Lithocystis Giard. Trophozoites large, ovoid or cylindrical; 

 attached for a long period to host tissue; pellicle with hairlike pro- 

 cesses; endoplasm with calcium oxalate cystals; spores ovoid, with 

 a long process at one end; in coelom of echinids. 



L. brachycercus Pixell-Goodrich (Fig. 205, a, b). In coelom of 

 Chiridota laevis (Canada); fully grown spherical trophozoites up to 

 200)u in diameter; spore with a short projection at one end. 



Genus Pterospora Racovitza and Labbe. Sporadins associative 

 or solitary; free end drawn out into 4 bifurcated processes; cysts 



