288 Sporozoa 



Fig. 6. 11. Acephalina: A-D. Lankesteria culicis Ross (after Ray), intra- 

 cellular stage (A), young trophozoite attached to intestinal epithelium (B), 

 xl332; mature trophozoite, cuticular striations omitted (C), x578; spore, 

 from living (D), x2280. E. Craterocystis papiia, schematic optical section show- 

 ing anterior "sucker," x70 approx. (after Cognetti). F. Elongated gametocyst 

 of Allantocyslis dasyhelei, x425 approx. (after Keilin). G. Rhynchocystis pilosa 

 Cuenot, young trophozoite, xl800 (after Troisi); see also Fig. 6. 2, C. H. 

 Apolocystis minuta, yoimg trophozoite, xl600 (after Troisi); compare with 

 Fig. 6. 1, C. I. Monocyslis agilis Stein, commonly 120-145/i (after Berlin). 

 J. Spore of Monocystis ventrosa (after Berlin). K. Ganymedes anapsides, 

 syzygy showing "ball-and-socket" junction, x515 approx. (after Huxley). L. 

 Beccaricystis loriai, "sucker" at anterior end; x630 approx. (after Cognetti). 



Family 4. Ganymedidae. Syzygy in primite-satellite fashion is charac- 

 teristic. Gametocysts are spherical. Life-cycles are incompletely known for 

 the only genus, Ganymedes Huxley (Fig. 6. 11, K). 



Family 5. Monocystidae. Mature trophozoites range from spheroid (Fig. 



