440 PROTOZOOLOGY 



Genus Cystobia Mingazzini. Trophozoites, large, irregular; fully 

 grown forms always with 2 nuclei, due to early union of 2 individ- 

 uals; spores oval, membrane drawn out and truncate at one end; 

 in blood vessels and coelom of Holothuria. 



C. irregularis (Minchin) (Fig. 205, h, i). Trophozoites irregular in 

 form; up to 500^ long; endoplasm opaque, granulated; cysts in 

 connective tissue of vessels; spore ovoid, epispore bottle-like, 25/i 

 long; in blood vessel of Holothuria nigra. 



Family 9 Allantocystidae Bhatia 



Trophozoites elongate cylindrical; cysts elongate, sausage-like; 

 spores fusiform, sides slightly dissimilar. 



Genus Allantocystis Keilin. Sporadins, head to head association; 

 cysts sausage-like; in dipterous insect. One species. 



A. dasyhelei K. (Fig. 205, j-m). In gut of larval Dasyhelea obscura; 

 full-grown sporadins 65-7 5ai by 20-22^; cysts 140-150/z by 20;u; 

 spores 18/i by 6.5/i. 



Family 10 Ganymedidae Huxley 



Trophozoites only known; mature individuals biassociative; pos- 

 terior end of primite with a cup-like depression to which the epi- 

 meritic organella of satellite fits; cysts spherical; spores unknown. 



Genus Ganjonedes Huxley. Characters of the family; Huxley 

 considers it as an intermediate form between Acephalina and 

 Cephalina. 



G. anaspides H. (Fig. 205, n). In gut and liver-tube of the crus- 

 tacean, Anaspides tasmaniae (of Tasmania); trophozoites in associa- 

 tion. 70-300^ by 60-130^; cysts 85-115m in diameter. 



Tribe 2 Cephalina Delage 



The body of a trophozoite is divided into the protomerite and 

 deutomerite by an ectoplasmic septum; inhabitants of the ali- 

 mentary canal of invertebrates, especially arthropods. 



One host species involved 



None-septate; epimerite a knob Family 1 Lecudinidae (p. 441) 



Septate 



Development intracellular 



Sporadins associative Family 2 Cephaloidophoridae (p. 442) 



Sporadins solitary Family 3 Stenophoridae (p. 442) 



Development extracellular 

 Sporadins associative 



Satellite non-septate Family 4 Didymophyidae (p. 442) 



Satellite septate Family 5 Gregarinidae (p. 443) 



