524 APPENDIX C. 



Family: H/emamcebiD/E (Wasielewski) 



Genus I. Hsemamoeba. The mature gametes resemble in form the sporocytes 

 before they have differentiated into spores. 



Species i. Hizmamaba danilewski or halteridiuni. 

 Parasite of pigeons, crows, etc. 



Species 2, Hcsmamceba relicta or profeosoma. 

 Parasite of sparrows, larks, etc. 



Species 3. Hamaniceha malariie. 



Parasite of quartan fever of man. 



Species 4. Haniamceba vivax. 



Parasite of tertian fever of man. 



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

 Species: Hamonienas prtscox. 



Parasite of malignant or aestivo-aulumnal 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 Feiier. — The cycle of development 

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

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

 margin than in the quartan type, and are thus less easily distinguishe.d 

 in the fresh blood ; the amoeboid movements are, however, rnuch 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. 



