270 SPOROZOA. 



Laverania malariee. Callanan (1926) found " tenue " forms 

 in blood-films containing Laverania malarise, and noted that 

 the " tenue " forms tended to preponderate in certain portions 

 of the film, whereas ring forms showed a predilection for others. 

 He concluded that near the edge of the blood-film, where the 

 red corpuscles are evenly distributed and lie singly, pressure 

 in spreading the film causes the deHcate hair-like rings of 

 Laverania malarise to become distorted into band-like " tenue " 

 forms. So the case for P. tenue as a distinct species is by 

 no means proved. 



Habitat. — Blood of man, in almost all parts of India, and 

 the body of the following species of mosquitoes : — Anopheles 

 annularis Ya,n der Wulp, A. culicifacies Giles {=A.fuliginosus), 

 A. fluviatilis James {=A. listoni Liston), A. maculatus Theo., 

 A. minimus Theo., A. philippinensis hudl., A.stephensi Liston, 

 A. sundaicus Rodenwaldt, and A. varuna Iyengar. For the 

 locahties in India, Burma, and Ceylon where Laverania 

 malarise infection is known to occur, the map reproduced 

 from Knowles, Senior White, and Das-Gupta (1930) at the 

 end of the description of malarial parasites of man (p. 279) 

 may be consulted, and for the relative importance of various 

 species of Anopheles in the transmission of malaria in different 

 parts, the useful summaries taken from Covell (1931) and 

 Christophers (1933) may be referred to. 



Genus PLASMODIUM Marchiafava & Celli, 1885. 



Malarial parasites, Laveran, 1880 a, p. 158; 1881, pp. 627-30; 



1882, p. 737. 

 Oscillaria (part), Laveran, 1883, p. 113. 

 Plasmodium, Marchiafava & Celli, 1885, p. 791 ; Golgi, 1889, 



p. 173. 

 Laverania -{-Hmmamceba, Laveran, 1890, p. 374 ; Grassi & Feletti, 



1892, p. 10. 

 Hsemamceba, Labbe, 1894, p. 170. 

 Plasmodium, Labbe, 1899, pp. 80-2. 

 Heemomenas, Ross, 1899, pp. 322-4. 



Hcemamceba, Ross, 1899, pp. 322-4, 439 ; 1900, pp. 522-7. 

 Plasm,odium, Liihe, 1900, pp. 367-84, pp. 436-60 ; Neveu-Lemaire, 



1900, p. 9 ; Minchin, 1903, pp. 239, 265, 267. 

 Heemamceba (part), Laveran, 1907, pp. 110-60. 

 Plasmodium, Minchin, 1912, p. 357 ; Row, 1917, p. 392 ; Castellani 



& Chalmers, 1919, pp. 504-16; Miihlens, 1921, pp. 1495-502; 



Thomson & Woodcock, 1922, pp. 1517-30 ; Hegner& Taliaferro, 



1924, pp. 317-40 ; Craig, 1926, pp. 362-470 ; Wenyon, 1926, 



pp. 908-85 ; Hehir, 1927, pp. 164-6 ; Knowles, 1928, pp. 382- 



410; Row, 1929, pp. 1120-5; Reichenow, 1929, pp. 998-1009; 



Kudo, 1931, pp. 286-7 ; Calkins, 1933, pp. 406-10, 566 ; Brumpt, 



1936, pp. 424-38. 



Trophozoites ring-shaped, amoeboid. Schizogony in the 

 peripheral blood. Schizonts, compact or irregular, may 

 completely fill the infected red blood-corpuscle, which may or 



