H^MOGREGARINA. 



119 



5 (4). Schizogony in the endothelial cells of 

 blood-vessels of a Vertebrate. Game- 

 togony and fertilization in the body of 

 a mite. Oocyst produces sporoblasts, 

 which are liberated as motile vermicules 

 and infect the host's eggs. The mite, 

 hatched from the egg, has the sporo- 

 cysts in its intestinal epithelium. These 

 are cast off and voided with the faeces, 

 which are eaten by the Vertebrate host. 



The sporozoites make their way to the [p- 154. 



endothelial cells Kaeyolysus Labbe, 



Genus HiEMOGREGARINA Danilewsky, 1885. 



Hsemogregarina, Danilewsky, 1885, pp. 588-98. 



Danilewskya, Labbe, 1894, p. 124. 



Danilewskya+Laverania, Billet, 1895, p. 30. 



Hsemogregarina, Labbe, 1899, pp. 76-7 ; Minchin, 1903, pp. 265, 



266-7, fig. 77 ; 1912, pp. 372-6 ; Wenyon, 1926, pp. 1081-4 ; 



Reichenow, 1929, pp. 924-7 ; Thomas & Robertson, 1929, 



pp. 104-5, 109-10 ; Kudo, 1931, pp. 279-81 ; Reichenow, 1932, 



p. 45 ; Calkins, 1933, pp. 545, 567. 



Schizogony takes place in the red blood- corpuscles or other 

 cells of the body of Vertebrates, merozoites escape from 

 the original host-cell and infect other corpuscles or cells. After 

 several generations merozoites develop into gametocytes in 

 the red blood- corpuscles. These are taken up with the blood 

 by an Invertebrate (leech), in the gut of which association 

 of the micro- and macrogametocytes occurs. The gameto- 

 cytes escape from their host-cells, become more or less spherical, 

 associate in pairs, and a cyst-wall is formed, enclosing both the 

 macro- and microgametocyte. The microgametocyte produces 

 two to four microgametes, and the macrogametocyte forms 

 a single macrogamete. One of the microgametes fertihzes the 

 adjacent macrogamete, and a small oocyst is formed. The 

 oocyst directly produces eight sporozoites without the formation 

 of sporocysts. 



The genus was founded by Danilewsky for the Hsemogre- 

 garine H. stepanowi Danilewsky of the European tortoise. 

 The life-history was described by Reichenow (1910) and may 

 be followed from fig. 45. 



45. Hsemogregarina berestneffi Castellani & Willey. (Fig. 46.) 



^Hsemogregarina sp. (probably new), Berestneff, 1903, pp. 343-8, 



pi. viii, figs. 1-9. 

 Hsemogregarina berestneffi, Castellani & Willey, 1905, p. 397. 

 "^Hsemogregarina sp., Patton, 1908, p. 319. _ 



\Hsemogregarina berestneffi, Dobell, 1910, p. 67, pi. u, figs. 3-8._ 

 Hsemogregarina berestnieffi, de Mello, de Sa, de Sousa, Dias, & 



Noronha, 1917, p. 13. 

 "^Hsemogregarina sp., Donovan (first recorded m Wenyon, iy/0, 



Hsemogregarina berestneffi, Wenyon, 1926, p. 1398 ; Scott, 1926, 



p. 238. 

 Hsemogregarina encapsulse, Wenyon, 1926, p. 1398. 



