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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 
tectum (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. 
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 Eestudo mauritanica. 
Resembles H. stepanozui . Two forms occur : (i) very 
granular, smaller forms, with two large refractile 
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 
