132 SPOKOZOA. 



Schizogony only in the liver. The mature schizont broadly 

 oval and lying in a thin- walled cyst closely surrounded by 

 hepatic cells. The cyst grows larger, large number of nuclei 

 are produced, and a correspondingly large number (some- 

 times as many as 115) of very small merozoites are produced. 

 Each merozoite has a pink-staining, hyaline protoplasm 

 and a well-marked nucleus. Gametocytes intra -corpuscular, 

 sausage-shaped, slightly curved, and lying with concave 

 border applied to the nucleus of the host- cell. Sometimes 

 a gametocyte may He with its convex border towards the 

 nucleus, or may occupy one end of the corpuscle. Sometimes 

 one or both extremities are effilated and slightly recurved. 

 The gametocytes may vary considerably in size : each is 

 enclosed in a thick capsule ; the cytoplasm stains (with 

 Leishman's stain) an azure-blue or faint pink colour, and 

 contains a large ovoid nucleus, staining a dull crimson. Two 

 or three gametocytes may be found in the same corpuscle. 

 Free forms are found in the plasma, having escaped by 

 rupture of the corpuscle, leaving the empty capsule behind. 

 Sporogony not known. The secondary host may perhaps 

 be a blood-sucking worm, Angiostoma sp., found in the lung 

 of the toad, or a sand-fly. 



Dimensions. — Mature schiznot 16/i, by 7/x ; fully developed 

 cyst 28-30 ju, by 24-5-26 ju, ; merozoite 3/x by l-3ju, ; gameto- 

 cytes from 9-5 ju. by 4 /x to 21-8 ju, by 4-8 /i. 



Habitat. — Blood of Bufo melanosticus Schneider : Punjab, 

 Ambala : Delhi ; United Provinces, Cawnpore ; also from 

 the same host from India in the Zoological Gardens, London. 



57. Hsemogregarina pythonis (Billet). 



Danilewshya pythonis. Billet, 1895, p. 30, figs. 1-3. 



H^mogregarina pythonis, Labbe, 1899, p. 76. 

 ■fHsemogregarina pococki, Sambon, 1907, p. 283. 

 ^Hsemogregarina sp., Patton, 1908, p. 318. 



Heeinogregarina pococJci, Dobell, 1908, p. 293. 



Hsemogregarina pythonis, Johnstone, 1912, p. 23.5. 

 JHse^nogregarina pococki, Plimmer, 1912, p. 412 ; 1913 p 148 - 



1914, p. 189; 1916, p. 85; 1917, p. 32. 

 jHrnmogregarina sp., Phisalix, 1913, pp. 1052-4. 



Hiemogregarina pythonis, Castellani & Chalmers, 1919, p. 487. 



Hsemogregarina sp., Wenyon, 1926, p. 1393. 

 ■fHeemogregarina pococki, Wenyon, 1926, p. 1393 ; Scott, 1926, p. 236. 



Intra-corpuscular. Body club-shaped, often folded in the red 

 blood- corpuscle. Anterior extremity broader and rounded. 

 Posterior extremitj^ attenuated and recurved. Cytoplasm 

 more or less granular. Nucleus median or nearer posterior 

 extremity, large, oval, and with coarse, deeply staining 

 chromatin granules. Parasite lies parallel or obliquely to 

 long axis of host-cell, of which it occupies about two-thirds. 



