SPOROZOA, GREGARINIDA 541 



full-grown sporadins 65-75/t by 20-22/t; cysts 140-150/1 by 20/z; 

 spores 18m by 6.5/i (Keilin, 1920). 



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 Ganymedes Huxley. Characters of the family; Huxley 

 considers it as an intermediate form between Acephalina and 

 Cephalina. 



G. anaspides H. (Fig. 2,31, n). In gut and liver-tube of the crus- 

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

 tion. 70-300/i by 60-130/x; cysts 85-1 15/z 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. Taxonomy 

 and distribution (Watson, 1916; Pinto, 1919; Kamm, 1922, 1922a). 



One host species involved 



None-septate; epimerite a knob Family 1 Lecudinidae (p. 542) 



Septate 



Development intracellular 



Sporadins associative Family 2 Cephaloidophoridae (p. 543) 



Sporadins solitary Family 3 Stenophoridae (p. 544) 



Development extracellular 

 Sporadins associative 



Satellite non-septate Family 4 Didymophyidae (p. 544) 



Satellite septate Family 5 Gregarinidae (p. 544) 



Sporadins solitary 



Epimerite simple knob-like 



Cysts with several ducts Family 6 Leidyanidae (p. 547) 



Cysts without or with one duct 



Family 7 Monoductidae (p. 548) 



Epimerite not simple knob-like 

 Epimerite cup-shaped or digitate 



Epimerite cup-shaped. . .Family 8 Menosporidae (p. 549) 

 Epimerite digitate. . . .Family 9 Dactylophoridae (p. 550) 

 Epimerite otherwise 



Spore hat-shaped Family 10 Stylocephalidae (p. 552) 



Spore of other shapes 



Spore with spines. .Family 11 Acanthosporidae (p. 554) 



Spore without spines 



Family 12 Actinocephalidae (p. 554) 



Two host species involved Family 13 Porosporidae (p. 558) 



