326 RESEARCH IN PROTOZOOLOGY 



the United States and Brazil. Up to 1924, 178 species of micro- 

 SPORIDIA and at least 222 host species had been known, and these 

 numbers have somewhat increased in the last five years. 



CLASSIFICATION 



After making a comparative study of several systems of classifi- 

 cation of MiCROSPORiDiA, the writer came to the conclusion that 

 that proposed by Leger and Hesse (1922) fitted best to the state 

 of our knowledge and adapted it (Kudo, 1924). Although num- 

 erous papers dealing with microsporidia have appeared since that 

 time, the system still remains the most satisfactory one. Unfor- 

 tunately three generic names proposed by Leger and Hesse (1921, 

 1922) were found to be preoccupied. Their replacement by new 

 names has not been well known and this has resulted in slight con- 

 fusion. For this reason the entire system is here given : 



Order microsporidia Balbiani, 1882 



Suborder monocnidea Leger et Hesse, 1922 

 Family nosematid^ Labbe, 1899 



Genus Nosema Nageli, 1857 emend. Perez, 1905 

 Genus Glugea Thelohan, 1891 emend. Weissenberg, 1913 

 Genus Perezia Leger et Duboscq, 1909 

 Genus Gurleya Doflein, 1898 

 Genus Thclohania Henneguy, 1892 

 Genus Stcmpellia Leger et Hesse, 1910 

 Genus Doboscqia Perez, 1908 emend. Kudo, 1924. 

 Genus Plistophora Gurley, 1893 

 Family coccosporid^ ^ Kudo, 1925 (for family cocconemid^ 

 Leger et Hesse, 1922) 

 Genus Coccospora^ Kudo, 1925 (for genus Cocconcnia 

 Leger et Hesse, 1921) 

 Family mrazekid^ Leger et Hesse, 1922 

 Genus Mrazckia Leger et Hesse, 191 6 



Genus Octosporca Flu, 1911 emend. Chatton et Krempf, 

 1911 



* Since Gtnus Cocconema Leger et Hesse was found by Dr. Cockerell to 

 be preoccupied by Cocconema Ehrenberg, 1829, genus Coccospora and family 

 coccospoRiD^ were suggested in their place (Kudo, 1925). 



