HiEMOGREGARINA. 



129 



Remarks. — -Schizonts of this species were discovered by 

 Wenyon (1909) in the lungs of Naja hajx in the Sudan. 



Fig. 55. 



-Haemogregarina najaa Laveran. A, elongated form ; B, re- 

 curved form ; G, form liberated from the corpuscle. (After 

 Laveran.) 



Habitat. — Blood of Naja naja (Linn.) : Madras, Madras 

 (also in specimens from India in the Zoological Gardens, 

 London). 



55. Haemogregarina nicorise Castellani & Willey. (Fig. 56.) 



■fHsemogregarina nicorise, Castellani & Willey, 1904, pp. 85-6, figs. 17- 

 27 ; Patton, 1908, p. 319 ; Robertson, 1908, p. 178 ; 1910^ 

 pp. 741-62, pis. xxxii-xli ; Dobell, 1910, p. 68 ; Alexeieff, 

 1912, p. 97. 

 Hsemogregarina nicoriee, Castellani & Chalmers, 1919, p. 486 ;: 

 Wenyon, 1926, pp. 1084, 1105, 1395 ; Reichenow, 1929, p. 927. 



Form elongate, Gregarine-like, with one end granular and 

 the other end clear, the central nucleus being a more or less 

 diffuse aggregation of chromatin granules. Sometimes the 

 organism is bent round upon itself. Schizogony takes place 

 in the blood-vessels of the lung and produces nearly 70 mero- 

 zoites, or in the circulating red blood- corpuscles producing six 

 to eight smaller merozoites which grow into gametocytes. 



When the Hsemogregarines are taken together with the 

 blood of the tortoise into the crop of the leech, some of them 

 pass into the intestine and are there found as motile vermicules. 

 They penetrate into the intestinal wall, where the differentia- 

 tion of the hitherto indistinguishable gametes takes place, 

 culminating in a process suggesting anisogamous conjugation* 

 The zygote breaks up to form eight sporozoites, which pass 

 through the intestinal wall into the blood-spaces. The 

 Hsemogregarine is probably passed into the blood of the tortoise 

 through contamination of the wound by the leech while 

 feeding. 



Dimensions. — Length 12^. 



Remarks. — The Hfe-history of the organism, as worked out 

 by Robertson, confirms in all essential respects that described 

 by Reichenow (1910) for H. stepanowi. In H. nicorias 



SPOR. K 



