436 PROTOZOOLOGY 



50-60/x; spores in 2 sizes, 1 1/x by 6m and Tju by 3/i and in chain. 



Genus Astrocystella Cognetti. Trophozoites sohtary; stellate with 

 5-9 lobes radiating from central part containing nucleus; anterior 

 surface with a depression. One species. 



A. lobosa C. (Fig. 203, I). In seminal vesicles of Pheretima heau- 

 fortii (New Guinea) ; diameter about 200^; spores fusiform. 



Genus Craterocystis Cognetti. Trophozoites solitary; rounded; 

 a sucker-like depression on anterior end; myonemes well developed, 

 running from concave to convex side. One species. 

 C. papua C. (Fig. 203, m). In prostate and lymphatic glands of 

 Pheretima wendessiana (New Guinea); trophozoites about 360- 

 390/i in diameter. 



Genus Choanocystella Cognetti (Choanocystis C). Trophozoites 

 solitary; rounded or ovate; anterior end with a mobile sucker and a 

 tentacle bearing cytoplasmic hairs; myonemes. One species. 



C. tentaculata C. (Fig. 203, n). In seminal vesicles of Pheretima 

 beaufortii (New Guinea) ; trophozoites 50At by 36^. 



Genus Choanocystoides Cognetti. Trophozoites solitary, rounded 

 or cup-shaped ; anterior end with a mobile sucker, bordered by cyto- 

 plasmic filaments. One species. 



C. costaricensis C. (Fig. 203, o). In seminal vesicles of Pheretima 

 heterochaeta (Costa Rica); trophozoites 40-45^ in diameter; nucleus 

 ovoid, large, 12/i in diameter. 



Genus Beccaricystis Cognetti. Mature trophozoites elongate, 

 cylindrical, with a sucker-like depression at anterior end; nucleus 

 at its bottom. One species. 



B. loriai C. (Fig. 204, a). In seminal vesicles of Pheretima ser- 

 mowaiana; trophozoites cylindrical, with wart-like growths, myo- 

 nemes run lengthwise with radially arranged transverse fibrils ; about 

 100m long. 



Genus Albertisella Cognetti. Mature trophozoites cup-shaped, 

 with anterior sucker with a smooth wall; nucleus at its bottom. One 

 species. 



A. crater C. In seminal vesicles of Pheretima sermowaiana. 



Family 6 Schaudinnellidae Poche 



Parasitic in the digestive system of oligochaetes; spores spherical; 

 trophozoites do not encyst; male trophozoites producing microgam- 

 etes and female, macrogametes ; zygotes or amphionts (spores) 

 rounded. 



Genus Schaudinnella Nusbaum. Trophozoites elongate spindle, 

 free in lumen or attached to gut wall; sporadins male or female; 



