CNIDOSPORIDIA, MYXOSPORIDIA 



527 



histozoic in fishes, also in amphibians and reptiles. Numerous species. 



M. lieherkuhni Butschli (Figs. 68, a, h; 252, a~d). In urinary blad- 

 der of Esox spp.; spores 18-20m by 5-6m; widely distributed. 



M. immersum (Lutz) (Cystodiscus immersus Lutz; M. lindoyense 

 Carini). (Fig. 252, e, /). In the gall bladder of species of Bufo, 

 Leptodactylus, Atelopus, etc.; in Brazil and Uruguay. Trophozoites 



Fig. 252. a-d, Myxidium lieberkuhni ^a, a trophozoite, X220 (Lieber- 

 kiihn); b, a small trophozoite, XlOOO; c, d, spores, X1400) (Kudo); 

 e, f, M. immersum, X1400 (Kudo); g-i, Sphaeromj/xa balbianii (g, Xf; 

 h, a spore, X1400 (Davis); i, spore with extruded polar filaments, X840 

 (Th61ohan)); j-1, S. sabrazesi (j, trophozoite, XlO; k, 1, spores, XlOOO) 

 (Schroder); m, n, Zschokkella hildae (m, X600; n, X1060) (Auerbach); 

 o-t, Coccomyxa morovi (o, a young binucleate trophozoite; p-s, develop- 

 ment of sporoblast; t, a spore with the extruded polar filament), X665 

 (Leger and Hesse). 



circular to oval, and very thin; up to 4 mm. in diameter; disporo- 

 blastic; polysporous. Spores 11. 8-13. 3m by 7.5-8. 6/x; shell-valves 

 marked with 1 longitudinal and 7-9 transverse ridges. 



M. serotinum Kudo and Sprague (Figs. 250, f-h; 251). In the gall 



