SPOROZOA, GREGARINIDA 445 



Genus Pjrxinoides Tregouboff. Sporadins biassociative; epimerite 

 with 16 longitudinal furrows, small cone at end. 



P. halani (Kolliker). Primite up to 130m; satellite 60/i long; in gut 

 of Balanus amphitrite and B. eburneus. 



Genus Anisolobus Vincent. Sporadins in syzygy; epimerite lack- 

 ing; protomerite of primite expanded to form sucker-like organella; 

 cysts ellipsoid, with thick envelope; with 6-8 sporoducts; spores 

 barrel-shaped. One species. 



A. dacnecola V. (Fig. 207, c). In midgut of Dacne rufifrons; 2 

 sporadins in syzygy 100-300/i by 20-50/x; cysts without envelope, 

 130-150^1 by 80-90)u; sporoducts 40-50/i long; spores in chain, dolio- 

 form, 6^1 by 4/x. 



Genus Carcinoectes Ball. Sporadins in syzygy of 2 or more individ- 

 uals; epimerite rudimentary; cysts without sporoducts; spores 

 round to ovoidal, not in chain; in gut of Crustacea. 



C. hesperus B. (Fig. 207, d, e). 2-6 sporadins in association; sporad- 

 ins up to 320/x by 9m; cysts about 140/x by 123m, attached to the wall 

 of hindgut; spores 8.6m by 7.7m, with 8 radially arranged sporozoites; 

 in gut of Pachygrapsus crassipes in California. 



Family 6 Leidyanidae 



Similar to the last two families; but sporadins are solitary and 

 epimerite simple knob-like; cysts with several sporoducts. 



Genus Leidyana Watson. Solitary; epimerite a simple globular 

 sessile knob; cysts with ducts; spores dolioform. 



L. erratica (Crawley) (Fig. 207,/). Sporadins up to 500m by 160m; 

 cysts about 350m in diameter; membrane about 30m thick; 1-12 

 sporoducts; spores extruded in chains, 6m by 3m; in gut of Gryllus 

 ahhreviatus and G. pennsylvanicus. 



Family 7 Monoductidae Ray and Chakravatry 



As in the last family solitary; but cyst with a single sporoduct or 

 none; spore with 8 sporozoites. 



Genus Monoductus R. and C. Sporadins solitary; epimerite a 

 small elevation with prongs attached to its base; anisogamy; cyst 

 with a single sporoduct; spores flattened fusiform, with dissimilar 

 ends, each with 8 sporozoites. One species. 



M. lunatus R. and C. (Fig. 207, m-o). Cephalins 225-445m by 

 33-4 7m; epimerite with about 16 prongs; nucleus parachute-shaped, 

 with myonemes attached at posterior margin; sporadins develop 

 posterior pseudopodial processes before association; cysts spherical, 

 225-230m in diameter, voided by host; development completed in 

 3-4 days outside the host body, with one duct; spores 10.25m by 4m, 



