548 



HETEROKA R YO TA 



a globular micronucleus situated near it. It develops asexually by 

 transverse division or by conjugation. It can encyst, and in this 

 condition pass from pigs to man. B. coli lives in the rectum of pigs, 

 and is transferred by its cysts to man. 



It was discovered by Malmsten in a man who had had cholera, 

 and was suffering from diarrhoea and ulcer of the rectum. The 

 ulcer had nothing to do with the disease, as it healed, while the 

 diarrhoea was probably due to the parasites. 



Casagrandi and Barbagallo produced catarrhal enterocolitis in 

 young cats by means of this parasite. 



Strong lias investigated, in a masterly manner, the enterocolitis 

 produced hyB. coli in the Philippine Islands. 



Balantidium minutum Schaudinn, 1899. 



The body is shortly oval, with a pointed anterior extremity. 

 Length, 20 to 32 [j,; breadth, 14 to 20 /.t. 



The peristome extends into the centre of the body, and has the 

 right lateral border fringed with cilia, and the left lateral border 



terminates in a hyaline membrane which can pass over to the 

 right side, and has a row of cirri. The cysts are oval. 



This parasite (along with Nydotherus faha) was found by 

 Schaudinn in a German who had often stayed in North America. 

 The symptoms were constipation alternating with diarrhoea asso- 

 ciated with abdominal pain. 



Balantidium minutum var. italicum Sangiorgi and Ugdulena, 1917. 



This parasite, which was found by Sangiorgi and Ugdulena in 

 human faeces, differs from.B. minutum in that the nucleus is excentric, 

 and in the peculiar orientation of the micronucleus. 



Fig. 201 . — Balantidium 

 minutum Schaudinn. 



Fig. 200. — Balantidium coli Malmsten. 



(After Hartmann. From 

 the Archiv filr Schiffs- 

 u. Tropenhygiene.) 



(After Hartmann. From the Archiv fi/r Schiffs- 

 u. Tropenhygiene.) 



