70 
,C. H. MART IX AND MURIEL ROBERTSON. 
6. Trichomonas Eberthi. 
The features which characterise the second Trichomonas 
form inhabiting the caeca of the fowl have already been 
mentioned on p. 59, but as in the case of this form we have 
to deal with a new factor, a rather complicated form change, 
the equivalent of which has not been met with in Tricho- 
monas gallinarum, we have been forced to divide our 
description under the following heads : 
(1) The typical active Tricho monas Eberthi. 
(2) The division of the active form. 
(3) The resting stage. 
(4) The intermediate stages between the resting and the 
active form. 
The Typical Active Trichomonas Eberthi. 
The body of Trichomonas Eberthi is, roughly, of a 
carrot-shape, measuring, on the average, about 9 ju long by 
4-6 fi broad at its widest point. 
Arising from the blunt anterior end there ar§ typically three 
long free flagella and a membrane flagellum, which runs back 
in connection with a very broad membrane along the side of 
the animal, to terminate freely beyond the animal's posterior 
end (PL 12, fig. 33). Near the blunt anterior end a small 
horn-shaped cytostome is frequently found. 
The blepharoplast lies near the anterior end, and consists 
probably of four darkly staining granules, each of which 
gives rise to a flagellum. Starting from the blepharoplast, 
rind running back along the base of the membrane to the 
animal’s posterior end, there is a very darkly staining* 
chromatic line. 
One of the best-marked differences between Tricho- 
monas Eberthi and the previously described Trichomonas 
gallinarum is given, as was stated on p. 59, by the arrange- 
ment of the chromatin blocks. These blocks are here much 
larger and more definite structures, and are arranged in an 
