H^MOGRBGARINA. 



135 



rounded or oval, placed at right angles to the long axis of the 

 organism, and containing chromatin granules of various 

 sizes. When the parasite doubles upon itself the two portions 

 are not equal, and the nucleus is always situated in the longer 

 part near the level of the bend. Extra-corpuscular form like 

 a vermicule, with one extremity much wider than the other. 

 The intra-corpuscular form, when about to multiply, assumes 

 an oval form, and its nucleus divides repeatedly into eight 

 nuclei ; the protoplasm then divides into as many parts, 



Fig. 60. — Hsemogregarina stepanowiana Laveran & Mesnil. A, B, 

 elongated corpuscular forms ; C, fuU-gi'own parasite doubled 

 upon itself ; D, free vermicule-like form ; E, form showing 

 nuclear multiplication. (After Laveran and Mesnil.) 



the corpuscle breaking up at the same time. Multiplication 

 forms were not found in the blood, but were numerous in 

 smears from the liver. 



Dimensions. — Extra-corpuscular form 18-20|U, by S/x. 



Remarks. — According to the authors of the species the young 

 form shows greatest resemblance to the young form of 

 H. stepanowi Danilewsky ; but the mature form differs markedly 

 from that species. In H. stepanowi the parasite becomes 

 doubled exactly about its middle, its nucleus is very elongate, 

 and the nucleus of the corpuscle is displaced, but not hyper- 

 trophied. The Kberated Hsemogregarine is a vermicule, 

 measuring 30-40 ju, by 3-4 /z. In H. stepanowiana the doubling 

 of the intra-corpuscular parasite is not exact, and the extra- 

 corpuscular vermicule is much shorter and wider than in 

 H. stepanowi. 



Habitat. — -Blood of the tortoise, Chinemys reevesii (Gray) 

 Ceylon. 



61. Hsemogregarina testudinis Laveran & Nattan-Larrier. 



'\Hsemogregarina testudinis, La^^eran & Nattan-Larrier, 1912, 

 pp. 134^6, 10 figs. (Abstract in Wiegmann's Archiv, 1913, p. 411). 

 Hsemocystidiurn testudinis, Castellani & Chalmers, 1919, p. 516. 

 Hsemogregarina testudinis, Wenyon, 1926, p. 1396. 



Small, medium, and large intra-corpuscular forms. Free 



