Phylum Fungilli [ 209 



monocystid gregarines, Muslow (1911) and Calkins and Bowling (1926) described 

 a reduction of the chromosome number immediately before gametogenesis, quite as 

 in typical animals. They described reduction as accomplished by a single process of 

 nuclear division; to current cytological theory, this is an impossibility. Dobell and 

 Jameson (1915), Jameson (1920), and Dobell ( 1925), dealing with organisms of the 

 same group and also with the coccodian Aggregata, found meiosis to occur immed- 

 iately after karyogamy. They conclude that all nuclei except those of zygotes are hap- 

 loid, as among most of the lower plants. 



The coccidian group, to which Goussia belongs, is here treated as primitive among 

 Sporozoa because the sperms of this group are flagellate. The detailed structure of 

 the flagella is unknown; they appear to resemble those of Bodo and Cryptobia. This 

 fact conveys the best available hint as to what may have been the evolutionary origin 

 of the Sporozoa. The majority of Sporozoa, having gametes which are alike or 

 scarcely differentiated, appear to be derived from forms with markedly differentiated 

 gametes. 



The Sporozoa are classified primarily by whether or not the trophozoites are intra- 

 cellular; by the occurrence or non-occurrence of asexual reproduction; and by the 

 production or non-production of spores in the sense in which the term is used in 

 deaHng with this group, that is, of walled cysts. 

 1. Sexual reproduction, so far as it is known, 

 involving oocytes which produce single large 

 eggs and spermatocytes which produce from 

 few to many sperms; the organisms multiply- 

 ing also asexually. 



2. The gametocytes not attached in pairs. 



3. Producing walled spores Order 1. Oligosporea. 



3. Not producing walled spores. 



4. Intracellular in erythrocytes Order 3. GYMNOSPORiDnoA. 



4. Producing macroscopic bodies 



in muscle Order 4. Dolichocystida. 



2. The gametocytes pairing before gameto- 

 genesis; sperms few; with or without 



walled spores Order 2. Polysporea. 



1. Gametes slightly differentiated or undifferen- 

 tiated, produced by the gametocytes in more 

 or less equal, usually large, numbers. 



2. The organisms multiplying also asex- 

 ually. 



3. Spores producing several sporozoites. . . . Order 5. Schizogregarinida. 

 3. Each spore producing one sporozoite. . . . Order 8. Haplosporidhdea. 

 2. The organisms not multiplying asexually. 

 3. Cells not elongate and divided into 



two parts Order 6. Monogystidea. 



3. Cells elongate and divided into two 



parts Order 7. Polycystidea. 



Order 1. OUgosporea Lankester in Enc. Brit. ed. 9, 19: 855 (1885). 



Tribe Monosporees and groups Disporees and Tetrasporees Schneider in Arch. 

 Zool. Exp. Gen. 9: 387 (1881). 



