550 



HETEROKA R YO TA 



The macronucleus is large and bean-shaped, while the micro- 

 nucleus is small and round. One or two vacuoles can be seen. The 

 cytopyge is situated posteriorly. 



In the faeces the parasite becomes rounded off and encysted, 

 and then divides into four. 



Nyctotherus africanus Castellani, 1905. 



Found by Castellani in a Baganda native. A^. africanus is hour- 

 glass shaped, with the anterior portion much less developed than 

 the posterior. Length, 40 to 50 ^; breadth, 30 to 40 u. The 

 surface is covered with very minute cilia, which are generally more 

 evident on the posterior portion, being almost invisible on the 

 anterior. 



The peristome is short. The cytoplasm is finely granular through- 

 out. The nucleus is situate far posteriorly, near the contractile 

 vacuole. The micronucleus is very small, and situated close to the 

 macronucleus. No food vacuoles are to be seen. 



Neither division, conjugation, nor encystment are known. 



The patient, who had diarrhoea alternately with long periods of 

 constipation, was suffering from sleeping sicknesr . 



The caecum contained many parasites, as did other parts of the 

 bowel. The mucosa of the caecum, colon, and rectum were slightly 

 congested, but not ulcerated. Castellani originally considered this 

 parasite to belong to the genus Nyctotherus, but more complete 

 investigations will probably show that it constitutes a new genus. 



SUBORDER HYMENOSTOMATA Biitschli, 1889. 

 Genus Uronema Dujardin, 1841. 



Definition. — ^Hymenostomata ovate or elongate with one or more caudal 

 setae. 



Type Species. — -Uronema marinum Dujardin, 1841 . 



Uronema caudatum. 



Found in a case of diarrhoea. 



REFERENCES. 

 Heterokaryota. 



Fantham, Stephens and Theobald (1916). Tlie Animal Parasites of Man. 

 London. 



HiCKSON. Treatise on Zoology, E. Ray Lankester, Part I.. Second Fascicle, 

 1903, p. 361. 



Calkins and Caullery. Archiv f. Protistenkunde, 1907, vol. x., 2 and 3, 

 P- 375- 



Metcalfe. Arch, f . Protistenkunde, 1907, vol. x., 2 and 3, pp. 183, 365. 



Chilodon dentatus. 



GuiART, M. J. (1903)- Comptes Rendus des Seances de la Societe de Biologic. 



Balantidium coll. 



Bensen (1908). Archiv f. Schiffs- u. Tropenhygiene, xii. 672. 

 Manslove (1917). PhiUppine Journal of Science, xii., Sec. B. 



