SPOROZOA, GREGARINIDA 389 



Family 8 Urosporidae Woodcock 



Coelomic parasites in various invertebrates; sporadins associa- 

 tive; spores with unequal ends; with or without epispores of 

 various forms, with 8 sporozoites. 



Genus Urospora Schneider. Large; frequently in lengthwise 

 association of 2 individuals of unequal sizes; spores oval, with a 

 long filamentous process at one end; in body cavity or blood ves- 

 sel of Tubifex, Nemertinea, Sipunculus, Synapta, and Chiridota. 

 Several species. 



U. chiridotae (Dogiel) (Fig. 177,/). 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, 

 pyrif orm or vermiform ; cysts spherical ; spore with a funnel at 

 one end, rounded at the other; in gut, coelom or ova of poly- 

 chaetes. 



G. minchini Goodrich et Pixell-Goodrich (Figs. 177, g^; 178, 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)u long, and encyst to- 

 gether in pairs; spores without well-developed funnel, 8-10^ 

 long. 



Genus Lithocystis Giard. Trophozoites large, ovoid or cylin- 

 drical; attached for a long period to host tissue; pellicle with hair- 

 like processes; endoplasm with calcium oxalate crystals; spores 

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



L. hrachycercus Pixell-Goodrich (Fig. 178, a, h). In coelom of 

 Chiridota laevis (Canada); fully grown spherical trophozoites up 

 to 200/i in diameter; spore with a short projection at one end. 



Genus Pterospora Racovitza et Labbe. Sporadins associative 

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

 spherical or oval; spores with epispore drawn out into 3 lateral 

 processes; in coelom of polychaetes. 



P. maldaneorum R. et L. (Fig. 178, c, d). In coelom of Liocepha- 

 lus liopygue; trophozoites about 140^ long; cysts 288ai by 214iu; 

 epispore 24;u in diameter; endospore 10-14ju by 3-4/i. 



Genus Ceratospora Leger. Sporadins elongate conical, head to 

 head association; without encystment; spores oval with a small 

 collar at one end and 2 divergent elongate filaments at other. One 

 species. 



