524 APPENDIX C. 



Family : H^MAMCEBID^ (Wasielewski) 



Genus I. I laemamoeba. The mature gametes resemble in form the sporocytes- 

 before they have differentiated into spores. 



Species I. Hccmamoeba danilewski or halteridium* 

 Parasite of pigeons, crows, etc. 



Species 2. Hcemamceba relicta or proteosoma. 

 Parasite of sparrows, larks, etc. 



Species 3. ffcemamceba malaria, 



Parasite of quartan fever of man. 



Species 4. ffesmamceba vivax. 



Parasite of tertian fever of man. 



Genus II. Hsemomenas. The gametes have a special crescentic form. 

 Species: Hamomenas prcecox. 



Parasite of malignant or sestivo-autumnal fever of man. 



In addition there are other species belonging to the same family of 

 blood parasites, which infect frogs, lizards, bats, etc., especially in 

 malarial regions. 



We shall now give the chief distinctive characters of the three 

 human parasites. 



1. Parasite of Quartan Fever. The cycle of development in man 

 is seventy-two hours, and produces pyrexia every third day ; double or 

 triple infection may, however, occur. In fresh specimens of blood the 

 outline is more distinct than that of the tertian parasite, and amoeboid 

 movement is less marked. Only the smaller forms show movement^ 

 and this is not of active character. The infected red corpuscles do not 

 become altered in size or appearance, and the pigment within the para- 

 site is in the form of coarse granules, of dark brown or almost black 

 colour. The fully developed sporocyte has a " daisy-head " appearance, 

 'dividing by regular radial segmentation into six to twelve spores, which, 

 on becoming free, are rounded in form. 



2. The Parasite of Mild Tertian Fever. The cycle of development 

 is completed in forty-eight hours, though a quotidian type of fever may 

 be produced by double infection. The amoebulae have a less refractile 

 margin than in the quartan type, and are thus less easily distinguished 

 in the fresh blood; the amoeboid movements are, however, much more 

 active, while longer and more slender processes are given off. The 

 infected corpuscles become swollen and pale, and may show deeply 

 stained points by the Romanowsky -method "Schiiffner's dots." The 

 pigment within the parasite is fine and of yellowish-brown tint. The 

 mature sporocyte is rather larger than in the quartan, has a rosette 

 appearance, and gives rise to fifteen to twenty spores, which have a 

 somewhat oval shape. 



