534 PROTOZOOLOGY 



E. ensis Z. (Fig. 227, k, I). Sporadins in syzygy 200-510/x long; 

 cysts 200-350yu in diameter; spores elongate ovoid; in gut of larvae 

 of Caenis sp. 



Genus Echinocystis Bhatia and Chatterjee. Body nearly spherical 

 with two spine-like structures extending out from the body surface; 

 solitary; spores biconical with equally truncated ends; in the seminal 

 vesicles of earthworms (Bhatia and Chatterjee, 1925). 



E. globosa B. and C. Body 740 m by 65m; spines sometimes un- 

 equally long; observations on spores incomplete; in the sperm sacs of 

 Pheretima heterochaeta. 



Family 2 Rhynchocystidae Bhatia 



Trophozoites ovoid, spherical or elongate, with a conical or cy- 

 lindro-conical trunk at anterior end; solitary; spore biconical, with 

 8 sporozoites. 



Genus Rhynchocystis Hesse. Trophozoites ovoid or cylindrical; 

 plastic epimerite, conical or cylindro-conical trunk; in seminal vesi- 

 cles of oligochaetes. Many species (Bhatia and Chatterjee, 1925; 

 Troisi, 1933). 



R. pilosa Cuenot (Fig. 229, a). In seminal vesicles of Lumbricus 

 terrestris, L. castaneus and Helodrilus foetidus; 217m by 25.5/*; pel- 

 licle with close, longitudinal ridges from which arise 'hairs' up to 

 40/i in length; endopLasm viscous, packed with oval (3m by 2m) 

 paraglycogen bodies; cysts ovoid, 95m by 84/x; spores 13.3m by 5m 

 (Troisi, 1933). 



R. porrecta Schmidt (Fig. 229, b, c). In seminal vesicles of Lum- 

 bricus rubellus and Helodrilus foetidus; extremely long with an en- 

 larged head; up to 2.5 mm. by 32-36m; sluggish; endoplasm granu- 

 lated, filled with oval (4m by 2-3m) paraglycogen grains; nucleus 17- 

 25m in diameter; spores 27.7-28m by 12m; sporozoites 13-18m by 3-5m 

 (Troisi, 1933). 



Family 3 Zygocystidae Bhatia 



Trophozoites in association; spores biconical, with peculiar thick- 

 enings at extremities; with 8 sporozoites; in seminal vesicles or coe- 

 lom of oligochaetes. 



Genus Zygocystis Stein. Sporadins pyriform, 2-3 in syzygy; in 

 seminal vesicles or coelom of oligochaetes. Several species. 



Z. wenrichi Troisi (Fig. 229, d, e). In seminal vesicles of Lumbricus 

 rubellus and Helodrilus foetidus; sporadins up to 1.5 mm. by 250m in 

 diameter; pellicle with longitudinal ridges which become free and 

 form a 'tuft of hairs' at the posterior end; cysts 500-800m by 300- 

 500m; spores 28m by 13m. 



