SPOROZOA, GREGARIXIDA 



535 



Genus Pleurocystis Hesse. Trophozoites in longitudinal or lateral 

 association; spores biconical. One species. 



P. cuenoti H. (Fig. 229, /). In the ciliated seminal horn of Helo- 

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

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

 diameter; spores 28. 5 m by 12/x (Hesse, 1909). 



Family 4 Aikinetocystidae Bhatia 



Trophozoites solitary or in syzygy; branching dichotomously, 

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



Fig. 229 a, Rhynchocystis pilosa, X200 (Hesse); b, c, R. porrecta: 

 b, X170 (Hesse); c, spore, X1330 (Troisi); d, e, Zygocystis wenrichi 

 (d, X45; e, X450) (Troisi); f, Pleurocystis cuenoti, X190 (Hesse); g, h, 

 Aikinetocystis singularis (h, X320) (Gates); i-k, Stomatophora coronata 

 (i, j, X430; k, X870) (Hesse); 1, Astrocystella lobosa, X120; m, Cratero- 

 cystis papua, X65; n, Choanocystella tentaculata, X570; o, Choanocystoides 

 costaricensis, X470 (Martiis). 



