MONOCYSTIS. 55 



8 (7). Trophozoite with a sucker-like differentia- [Bhatia, p. 68. 



tion at the anterior end Stomatophoridse 



9 (4). Adult trophozoites always associated in [Bhatia, p. 72. 



pairs Zygocystidae 



10 (3). Trophozoite branching at the anterior [Bhatia, p. 73. 



end Aikinetocystidae 



11 (2). Sporocysts provided with spines at either [Bhatia. 



extremity Syncystidse * 



12 (1). Sporocysts not bieonical. Trophozoites 



with or without an epimerite 13. 



13 (14). Sporocysts oval or spherical. Gametes [Bhatia, p. 76. 



net differentiated Diplocystidse 



14 (13). Sporocysts spherical. Gametes differenti- [Poche. 



ated Schaudinellidae *, 



1. Family MONOCYSTIDiE Stein, emend. 

 Bhatia, 1930. 



Trophozoites oval, spherical or elongated, without any 

 differentiation at the anterior end, sohtary. Sporocysts 

 bieonical, with similar, non-appendiculate poles, octozoic. 

 The family includes four genera {vide Bhatia, 1930), of which 

 three are known from India. 



Key to Indian Genera. 



1 (4). Trophozoite ovoid or spherical 2. [p. 55. 



2 (3). Trophozoite ovoid Monocystis Stein, 



[p. 59. 



3 (2). Trophozoite spherical Apolocystis Cognetti, 



4(1). Trophozoite elongated, cylindrical, lil^e [p. 60. 



a Nematode worm Nematocystis Hesse, 



Genus MONOCYSTIS Stein, 1848, emend. Hesse, 1909, 

 and Cognetti, 1923. 



Monocystis, Stein, 1848, pp. 183-223 ; Lankester, 1863, p. 93 

 1866, pp. 23-8 ; 1872, pp. 342-51 ; Blitschli, 1880-2, p. 576 

 Ruschhaupt, 1885, pp. 1-38 ; Bosanquet, 1894, pp. 421-33 

 Labbe, 1899, p. 38 ; Cuenot, 1901, pp. 581-654 ; Cecconi, 1902 a 

 pp. 132-5 ; 1902 b, pp. 122-40 ; Minchin, 1903, pp. 154-66 

 Brasil, 1905 a, pp. 17-38 ; 1905 b, pp. 69-99 ; Hesse, 1909, p. 44 

 Hoffmann, 1909, pp. 139-66 ; Mulsow, 1911, pp. 20-55 ; Minchin, 

 1912, pp. 23, 174, 328, 331, 332, 333, 336, 339 ; Cognetti, 1923, 

 pp. 250-3 ; Berlin, 1924, p. 14 ; Cognetti, 1925, p. 229 ; Wenyon, 

 1926, p. 1147 ; Calkins & Bowling, 1926, pp. 385-99 ; Knowles, 

 1928, p. 499; Reichenow, 1929, p. 886; Bhatia, 1929, p. 122; 

 1930, p. 158 ; Kudo, 1931, pp. 57, 74, 293 ; Calkins, 1933, pp. 99, 

 100, 309, 559. 



Trophozoites ovoid, without marked differentiation anteriorly^ 

 often provided at the anterior pole with a mucron, solitary. 

 Sporocysts as defined for the family. 



* placed after the name of a family indicates that no representative 

 of the family has as yet been recorded from India, Burma or Ceylon. 



