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Genus Haemogregarina* 



The haemogregarines are unpigmented uni- 

 cellular organisms, which, at one stage of their 

 development, have a worm-like form. They occur 

 as endoglobular parasites, and also as free forms 

 in the plasma. I'he vermicule stage may be both 

 endoglobular and free. ,The sexual and asexual 

 cycles occur, as far as is known, in the same host. 

 They occur in fish, amphibians, and reptiles, but 

 not in mammals, and, unlike the gregarines, not 

 in invertebrates. They are, so far as is known, 

 non-pathogenic, and they cannot be transmitted 

 by inoculation from one animal to another. The 

 cycle of development, as far as it is known, will be 

 described under the various species. 



Fig. 70. H. vanarum {or Drepanidium ranavum) young 



form, Gametes jree in the Plasma, and Fission forms 



in Spleen. {Partly after Minchin) 



I. H. ranarum (= Lankesterella vanarum). 

 Found in the blood of Rana esculenta (edible 

 frog). This species includes, according to 

 Laveran, two species, H. prtnceps and H. monilts, 

 described by Labbe. Here, as in other species of 



Note, — Ample material for the study of these parasites is 

 readily obtainable in the tropics. Frogs, toads, lizards, snakes, 

 tortoises, etc., are commonly infected. Examine especially the 

 liver and internal organs for developmental forms. Examine 

 carefully for ticks, lice, etc, and possible cycles in these. 

 Preserve all ecto parasites in spirit for subsequent identification. 



