SPOROZOA, GREGARINIDA 



433 



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. 



Fig. 202. a-c, Monocystis ventrosa (a, X260; b, Xl50; c, XS30) 

 (Berlin); d, e, M. lumhrici, X280 (Berlin); f. Apolocystis gigantea, 

 X90 (Troisi); g, A. minuta, with attached phagocytes, X770 (Troisi); 

 h, Nematocystis vermicularis, X80 (Hesse); i, j, Rhabdocystis claviformis 

 (i, X220; j, X270) (Boldt); k, 1, Enterocystis ensis (k, Xl40) (Zwetkow). 



Genus Rhjmchocystis Hesse. Trophozoites ovoid or cylindrical; 

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

 cles of oligochaetes. Many species. 



R. pilosa Cuenot (Fig. 203, a). In seminal vesicles of Lumbricus 

 terrestris, L. castaneus and Helodrilus foetidus; 217/x by 25.5^; pel- 

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

 40/i in length; endopl^asm viscous, packed with oval (Sn by 2n) 



