331 



at one end of the cyst is a deep staining mass. 

 According to Billet there is a second cyst 

 included in the first. This second cyst shows 

 stippling with Romanowsky, but the red cell is 

 not hypertrophied. (ii) Elongated halter-form, 

 i8 M by 4-5 M. Parasites especially abundant in 

 the liver. 



13. H. viperini. — Or Karyolysus viperini. The 

 parasite bores into the nucleus, and, eventually, 

 encysts there. 



i'ig. 73A. H. viperini. (i) ydung parasite; (2) the parasite 

 is encysted in the nucleus, the cyst and the red cell show stippling 

 (Romanowsky). H.bagensis. (i) vermicule ; (2) encysted stage. 



14. H. bagensis. — In a tortoise (Emys leprosa) 

 in Tunis, (i) Young stage does not exceed three- 

 quarters the length of red cell, (ii) Vermicule 

 stage encysted. The cyst does not stain. Nucleus 

 variable in position, always central according to 

 Billet. (iii) Large oval forms. (iv) Division 

 forms in liver. 



15. H. ser gentium. — In a lizard, Gongylus 

 ocellatus. Has a destructive action on the nuclei 

 of the red cells. They flatten and elongate, and 



