274 



According to Siegel infection is transmitted by 

 a leech (Placobdella catenigera). The ookinets reach 

 the oesophageal glands and give rise to numerous 

 sporozoits, which pass out during the process of biting. 



2. H. mesnili. In the blood of a tortoise, Emys 

 tec turn (Fig. 85). 



Amoeboid forms, reniform, and vermicule forms 

 occur. Besides these, free merozoits, but their origin 

 is obscure. The form of the vermicule is characteristic 

 at one stage of its development. 



Fig. 88. H. stepanowi, Endoglobular and free Vermicule s ; 

 . H. lacertarum, shewing disintegration of Nucleus of 

 Red Cell; H. lacazei, H. lacertarum, Cyst 

 with Makromerozoits 



3. H. laverani. In the blood of Indian tortoises, 

 Cryptopus granosus. Similar forms occur to those of 

 the last species. The vermicule is characterized by a 

 blunt hook-like appendage, and the presence of two 

 bright granules. The parasite is endoglobular in 

 all its stages (Fig. 85). 



4. H. mauritanica. In Testudo mauritanica. 

 Resembles H. stepanowi. Two forms occur : (i) very 

 granular, smaller forms, with two large retractile 

 granules at each end ; (ii) larger, uniformly pale forms. 

 In stained specimens the smaller forms appear oval or 

 reniform, with a nucleus transversely placed. The 



