H^MOGREGARIN A . 



137 



the nucleus between them. Infected cells, especially those 

 with two parasites, are increased in size. 



Schizogony takes place in the endotheUal cells of the 

 capillaries of the lung, and is of two forms. One form of 

 schizont produces a smaller cyst, with larger and less numerous 

 merozoites, and the other form produces a larger cyst, with 

 smaller and more numerous merozoites. In the former case 

 the schizont in the endotheHal cell is broadly oval, and usually 

 forms a smaller cyst giving rise to 16 merozoites. The larger 

 cysts are more rare, and may contain as many as 40 merozoites. 

 What the two kinds of merozoites develop into has not been 

 determined. The process probably differs from that described 



Fig. 61. — Hsemogregarina thomsoni Minchin. A, small iiitra-corpusciilar 

 form ; B, large intra-corpuscular form showing the so-called 

 " capsule " ; C, a large and an intermediate-sized form iia the 

 same corpuscle ; D, two large individuals lying side by side, 

 both on one side of the nucleus ; E, two large individuals 

 embracing the nucleus between them ; F, the free form. 

 (After Minchin.) 



by Reichenow and Robertson for the Haemogregarines of 

 cold-blooded Vertebrates. 



Dimensions. — Intra-corpuscular forms, young 9-11 /x in 

 length, full-grown 15-17 ft by 5 ju. ; schizonts 15 /m by 6 /x ; 

 cysts, smaU 21-5 )u, by 14-5 fi, large 25 /x by 15 /j,. 



Habitat. — ^Blood of the lizard, Agama tuberculata Gray : 

 Punjab, Kasauh. 



