686 



ORDEE: DIPLOMONADIDA 



cytostome to exist in this remarkable position. It seems more probable 

 that he was observing species of Hexamita, in which had occurred some 

 deformity of this part of the body, which is known to be very metabolic. 

 Moroff (1903) proposed to employ Kleb's name, Urophagus, for these 

 flagellates, owing to the uncertainty as regards the flagellates which 

 Dujardin named Hexamita. There seems to be no doubt, however, that 

 Dujardin was actually dealing with forms which are known to possess 



Fig. 288. — Hexamitus muris from the Intestine of the Mouse {xca. 3,000). 

 (After Wen yon, 1907.) 



1. Ordinary free form. 2-4. Dividing forms. 



5-6. Encysted forms, showing division of nuclei. 



eight flagella, so that there is no reason why his name Hexamita should 

 not be employed. 



Hexamita muris (Grassi, 1881). — This species was first seen by Grassi as 

 a parasite of the intestine of mice and other small rodents. It was named 

 by him Dicercomonas tnuris. What is probably the same form was seen 

 by Prowazek (1904a) in rats, and named Octomitus intestinalis. Lavier 

 (19216) records the flagellate from the field vole, Microtus arvalis. The 

 organism was studied by the writer (1907). It has a rounded anterior 



