238 SPOROZOA. 



its nucleus displaced. Shows a marked tendency to hsemolyse 

 the infected cell and become free, taking in this free condition 

 aberrant forms like deformed halteridia or spheres. 



Habitat. — Blood of Thereiceryx zeylanicus inornata Walden : 

 PoRTTJGTJBSE India, Corlim (Ilhas). 



195. HsBmoproteus (?) thereieerycis var. zeyloniea de Mello. 



•fHeemoproteus thereieerycis var. zeyloniea, de Mello, 1935, p. 470 ; 

 1937 a, pp. 100, 101-2. 



Female gametocyte with vacuolated cytoplasm, stained 

 dark blue with Leishman's stain ; nucleus round, seldom 

 elongated, central or subcentral ; pigment granules scattered, 

 minute, often in clusters. Male gametocyte colourless ; 

 nucleus large and without definite outline, always central, 

 and containing chromatic masses with irregular disposition ; 

 pigment granules very minute, situated at the poles. 

 Infected red cell hypertrophied, with its nucleus displaced. 



Remarks. — This variety differs from the preceding species as 

 regards the structure of the male gametocyte, and does not 

 show the same tendency to hsemolyse the host- cell. 



Habitat. — ^loodoi Thereiceryx zeylanicus zeylanicus (Gmelin) : 

 Portuguese India, Malim (Bardez) ; blood of Thereiceryx 

 viridis Bodd. : Portuguese India, Ponda. 



Genus LEUCOCYTOZOON Danilewsky, 1889. 



Leucocytozoon, Danilewsky, 1889, p. 23 ; Berestneff, 1903, pp. 376- 

 86 ; Wenyon, 1910, pp. 63-72 ; Franca, 1912, pp. 173-6 ; Mathis 

 & Leger, 1912, pp. 77-82 ; Minchin, 1912, pp. 357, 369-71, 

 390, 392 ; Moldovan, 1914, pp. 249-62 ; Wenyon, 1926, pp. 903-8; 

 Kudo, 1931, p. 288 ; Calkins, 1933, p. 566 ; de Mello, 1935 a, 

 pp. 355-7 ; 1935 b, pp. 68-73 ; Reichenow, 1935, p. 375. 



Schizogony takes place in the internal organs of the host, 

 probably in the endothelial cells of the blood-vessels (as in 

 Heemoproteus). Certain cells in the peripheral blood, which 

 were originally thought to be leucocytes (hence the name of 

 the genus) but are now believed to be young erythrocytes, 

 in which the colouring matter has not yet developed, contain 

 the gametocytes in various stages of growth. No pigment 

 is produced. Micro- and macrogametocytes are differentiated, 

 the nucleus of the microgametocyte is large and contains 

 numerous diffuse chromatin granules, while that of the macro- 

 gametocyte is compact and contains a definite karyosome. 

 The host-cell is profoundly modified into an elongate fusiform 

 body, much larger than the normal red blood- corpuscle, and 

 contains the elongate and hypertrophied nucleus of the cell 

 and the elongate gametocyte. The gametocytes leave the 



