MYXOSPORIDIA 305 



adopted the writer's scheme and included it in their treatises on 

 protozoa. In the following, the system is revised in order to in- 

 clude three genera which were not included in it before : 



Order myxosporidia Bi^itschli, 1881 ^ 



Suborder eurysporea Kudo, 1920 

 Family ceratomyxid^ Doflein, 1899 



Genus Ceratomyxa Thelohan, 1892 



Genus Lcptothcca Thelohan, 1895 



Genus Myxoproteus Doflein, 1898 emend. Davis, 1917 



Genus IVardia Kudo, 1920 



Genus Mitraspora Fujita, 1912 emend. Kudo, 1920 

 Suborder sph^rosporea Kudo emend.- 



Spores spherical or subspherical ; one, two or four polar capsules. Sporo- 

 plasm without iodinophilous vacuole. Vegetative form found in organ- 

 cavities and tissues. In marine and fresh-water fish and amphibians. 



Family chloromyxid^ Thelohan, 1892 



Genus Chloromyxiun Mingazzini, 1890 

 Family sph^rosporid.e Davis, 191 7 emend.- 



Spores with one or two polar capsules. Monosporous, disporous, poly- 

 sporous. 



Genus Sphccrospora Thelohan, 1892 

 Genus Simiolinea Davis, 191 7 

 Genus Unicapsula Davis, 1924. 



Spores with one polar capsule. Shell-valves asymmetrical. In the 

 muscle cell of marine fish. Polysporous. Type and only species : 

 Unicapsula muscular is Davis, 1924. 



Suborder platysporea Kudo, 1920 emend.- 



Sutural plane of the spore coincides with or at an acute angle to the 

 longest diameter. One, two or four polar capsules. Sporoplasm with or 

 without iodinophilous vacuole. 



Family myxidiid.^ Thelohan, 1892 



Genus Myxidium Biitschli, 1882 



Genus Sphccromyxa Thelohan, 1892 



Genus ZschokkcUa Auerbach, 1910 

 Family coccomyxid^ Leger et Hesse, 1907.- 



^ For definitions of these groups not mentioned here, the reader is referred 

 to Kudo (1920). 



