176 



FAMILY: AMCEBID^ 



faeces, or other material, has been referred to by various observers as 

 Amoeba hyaUna, a name given to it by Dangeard (1900). The generic 

 name Hartmannella was created by AlexeiefE (1912cf). The amceba 

 which was cultivated from human faeces by Musgrave and Clegg (1904) 

 in the Philippines, the one described by Liston and Martin (1911) in 



m 



0- A 



(S^ 



Fig. 



-Stages in the Nuclear Division of a Species of Hartmnnnella isolated 

 FROM Pigs' F.^ces {xca. 3,400). (Original.) 



India as occurring in culture media inoculated with liver abscess pus, 

 and water, and the form growing on plates after exposure to the air, 

 as noted by Wells (1911), are probably this species. 



The amoeba, when spherical, has a diameter of 9 to 17 microns. It 

 has a contractile vacuole, while the nucleus consists of a nuclear membrane 





■■*■■■ . ' ■ . .^ - 



Fig. 89. — Hartmannella hyalina ( x 2,000). (After Dobell and O'Connor, 1921.) 



L Ordinary amoeba. 



2. Division stage, showing pointed spindle with equatorial plate of chromosome.s. 



3. Cyst with crinkled wall. 



and large central karyosome (Fig. 89). Peripheral chromatin granules 

 occur on the nuclear membrane, and in the clear zone between it and the 

 karyosome. At the time of division the karyosome disintegrates, and 

 a spindle is formed, at the equator of which the chromatin, in the form 



