GENUS: HEXAMITA 



685 



same genus. It is now known that the forms in stagnant water likewise 

 have two posterior flagella, as well as six anterior ones, so that it seems 

 evident the name Hexamita must be employed for these flagellates. Dobell 

 (1909), though admitting that Dujardin overlooked two flagella in the 

 intestinal form, apparently thinks he may not have done so in the case of 

 the type species, H. inflata, though both were described at the same time 

 and were regarded as having the same number of flagella. Dobell therefore 

 adopts for the parasite of frogs the name Octomitus, proposed by Prowazek 



Fig. 



587. — Hexamita intestinalis from the Eectum of the Fkog ( x 5,000). 

 (Original.) 



1. Ventral view of living flagellate. 

 3. Appearance in stained film. 

 4-5. Arrangement of nuclei and blepharoplasts as 

 after exposure to osmic acid vapour and drj': 

 G. Binucleated cyst. 



2. Side view of living flagellate. 



seen in flagellates stained by Giemsa stain 

 ng- 



7. Cyst after division of two nuclei. 



(1904f/). It seems to the writer that if it be accepted that Dujardin 

 overlooked flagella in the intestinal form, as he undoubtedly did, it must 

 be assumed he did so in the free-living form also. Klebs (1892), who first 

 realized that the intestinal form had eight flagella, described as Urophagus 

 rostratus a free-living form of similar structure, but which was said to 

 possess a cytostome at the posterior end of the body. As pointed out by 

 Alexeieff (1910), it seems very doubtful if he was correct in supposing a 



