CNIDOSPORIDIA, MYXOSPORIDIA 655 



histozoic or coelozoic in freshwater or marine fish and also in amphib- 

 ians. Numerous species. 



C. leydigi M. (Figs. 70, c, d; 280, I, m). In the gall-bladder of vari- 

 ous species of Raja, Torpedo and Cestracion; spores 6-9/x by 5-6ju; 

 widely distributed. Structure and development (Erdmann, 1917; 

 Naville, 1927). 



C. trijugum Kudo (Fig. 280, n). In the gall-bladder of Xenotis 

 megalotis and Pomoxis sparoides; spores 8-10/x by 5— 7/x. 



Genus Kudoa Meglitsch. Resembles Chloromyxum; but spores 

 stellate or quadrate in anterior end-view; spore membrane delicate 

 and the sutures indistinct; four shell-valves (?); histozoic (Meg- 

 litsch, 1947a). Several species. 



K. clupeidae (Hahn) (Fig. 282, i-l). In the body muscles of 

 Clupea harengus, Brevoortia tyrannus, etc.; spores 5.1m by 6.4m; 

 polar capsules 1.5m by 1m (Meglitsch, 1947). Nigrelli (1946) found 

 this species in the ocean pout {Macrozoares americanus). 



K. thyrsites (Gilchrist) (Fig. 282, m-p). In the body muscles of the 

 barracouta, Thyrsites atun, in Australia and Africa; pyramidal spores 

 6-7 m high and 12-1 7 m wide; two uninucleate sporoplasms; polar 

 capsules homogeneous in appearance (Willis, 1949). Effect on host 

 (p. 649). 



Suborder 3 Platysporea Kudo 



Without iodinophilous vacuole 



2 polar capsules, one at each pole Family 1 Myxidiidae 



1 polar capsule Family 2 Coccomyxidae (p. 658) 



2 or 4 polar capsules grouped Family 3 Myxosomatidae (p. 658) 



With an iodinophilous vacuole Family 4 Myxobolidae (p. 658) 



Family 1 Myxidiidae Thelohan 



Genus Myxidium Butschli (Cystodiscus Lutz). Spores fusiform with 

 pointed or rounded ends; polar filament comparatively long, fine; 

 coelozoic or histozoic in fishes, also in amphibians and reptiles. Nu- 

 merous species. 



M. lieberkuhni Butschli (Figs. 70, a, b; 284, a-d). In urinary blad- 

 der of Esox spp.; spores 18-20/z by 5-6 /x; widely distributed. De- 

 velopment (Cohn, 1896; Debaisieux, 1916); division (Kudo, 1921a; 

 Bremer, 1922). 



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

 Carini). (Fig. 284, e, f). In the gall bladder of species of Bufo, 

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

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

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



