HiEMOPROTETJS. 213 



central, small, elliptic or irregular, containing one chromatic 

 dot fairly visible, surrounded by the rest of the chromatic 

 substance which is hardly visible, stained pale rose ; pigment 

 coffee-brown with oHve tone, situated at the poles. 



Remarks. — Unnamed species of Hsemoproteus have previously 

 been recorded from several species of Cerchneis in different 

 parts of the world. According to de Mello, Wasielewski and 

 Wiilker (1918) recorded the parasite of this bird in Europe as 

 H. danilewskyi var. tinnunculus, and not having access to 

 that paper he has refrained from giving his form a specific 

 name. On comparing his description with Wasielewski and 

 Wiilker 's figure, as reproduced by Reichenow, the nucleus 

 of the microgametocyte in var. tinnunculus is large and does 

 not correspond with the description as given by de Mello. 

 I have, therefore, named the parasite found by de Mello as 

 H. cerchneisi. 



Habitat. — Blood of Cerchneis tinnunculosus objurgatus 

 Stuart Baker : Portuguese India, Pragana. 



150. Hsemoproteus columbae CelH & San FeHce. (Figs. 104, 

 105.) 



Hsemoproteus danilewskii (part), Kruse, 1890, p. 359. 



Hsemoproteus columbse, Celli & San Felice, 1891, pp. 517-18, 541-8, 

 pi. vi; Ed. & Et. Sergent, 1907, pp. 264-74, pis. vi, vii. _ 



Halteridium columbse, Aragao, 1908, pp. 154r-67, pis. xi-xiii. 



Haemcproteus columbse, Minchin, 1912, pp. 365-6, fig. 157. 



Hsemoproteus sp., Sergent & Beguet, 1914, pp. 21-3. 

 ■\Heemoproteus sp., Acton & Knowles, 1914, pp. 663-90, pis. xlvii-li ; 

 Alcock, 1914, p. 584 ; Helen Adie, 1915, pp. 671-80. 



Hsemoproteus columbse, Castellani & Chalmers, 1919, pp. 525-6, 

 figs. 185, 186; Helen Adie, 1924, pp. 605-13, 2 pis.; 1925, 

 pp. 9-15, 5 figs. ; Wenyon, 1926, pp. 886, 888-96, 1314, 

 figs. 383-6 ; Knowles, 1928, pp. 372-7, figs. 87, 88 ; Reichenow, 

 1929, pp. 973-5, 978, figs. 938-40, 942 ; Kudo, 1931, p. 288, 

 fig. 122e, /; Ruiz Martinez, 1934, pp. 96-8; Coatney, 1936, 

 p. 88 ; de Mello, 1937 a, p. 99. 



Schizogony takes place in the endothehal cells of the blood- 

 vessels of various organs of the pigeon, particularly the lungs. 

 The youngest schizonts are minute cytoplasmic bodies with 

 a single nucleus within the cytoplasm of an endothehal ceU 

 (fig. 104, P) . Growth, nuclear multiphcation, and segmentation 

 into fifteen or more small uninucleated unpigmented masses 

 take place (fig. 104, Q). Each of these cytomeres grows; its 

 nucleus undergoes repeated division till the host-cell, now 

 considerably hypertrophied, is filled by a number of multi- 

 nucleate bodies, each of which is surrounded by a fine membrane. 

 Within this membrane the multinucleate cytomere divides 

 into an enormous number of merozoites (fig. 104, R-W). The 

 endothelial cell finally breaks down and the merozoites escape 

 into the blood-stream. It is possible that some of them 



