434 PROTOZOOLOGY 



zooamylon bodies; cysts ovoid, 95/i by 84^1; spores 13.3/i by 5^. 

 R. porrecta Schmidt (Fig. 203, 6, c). In seminal vesicles of Lum- 

 hricus ruhellus 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 {4n by 2-3/x) paraglycogen grains; nucleus 17- 

 25)u in diameter; spores 27.7-28/x by 12iu; sporozoites 13-18/x by 3-5/i. 



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. 203, d, e). In seminal vesicles of Lumbricus 

 ruhellus and Helodrilus foetidus; sporadins up to 1.5 mm, by 250/i in 

 diameter; pellicle with longitudinal ridges which become free and 

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

 500//; spores 28m by 13m. 



Genus Pleurocystis Hesse. Trophozoites in longitudinal or lateral 

 association; spores biconical. One species. 



P. cuenoti H. (Fig. 203, /). In the ciliated seminal horn of Helo- 

 drilus longus and H. caliginosus; 2 mm. by 300m ; pellicle striated 

 longitudinally, oblique near the posterior end; cysts 1.5-2 mm. in 

 diameter; spores 28.5m by 12m. 



Family 4 Aikinetocystidae Bhatia 



Trophozoites solitary or in syzygy; branching dichotomously, 

 branches with sucker-like organellae of attachment; spores biconical. 



Genus Aikinetocystis Gates. Trophozoites cylindrical or columnar, 

 with a characteristic, regular dichotomous branching at attached 

 end, with sucker-like bodies borne on ultimate branches; solitary or 

 2 (3-8) individuals in association; spores biconical. 



A. singularis G. (Fig. 203, g, h). In coelom of Eutyphoeus foveatus. 

 E. rarus, E. peguanus and E. spinulosus (of Burma) ; trophozoites up 

 to 4 mm. long; number of branches 8 or 16, each with an irregular 

 sucker; ovoid nucleus near rounded end; spores of two sizes, 20-23m 

 long and 7-8m long; a few cysts found, ovoid and about 600m long. 



Family 5 Stomatophoridae Bhatia 



Trophozoites spherical to cylindrical or cup-shaped; with a sucker- 

 like epimerite; solitary; spores navicular, ends truncate; 8 sporo- 

 zoites; in seminal vesicles of Pheretima (Oligochaeta) . 



