FURTHER OBSERVATIONS ON CLECAL PARASITES OF FOWLS. 71 
irregular double row near the anterior end. They lie over 
the nucleus in such a way that if the side of the animal down 
which the line and membrane run be regarded as dorsal, then 
the blocks are always on the animal’s right side. A large 
and well-developed axostyle is always present. It arises 
apparently from the blepharoplast, and after a slightly 
sinuous course ends in a sharp point beyond the animal’s 
posterior end. 
The nucleus is a markedly elongated oval structure, and 
the chromatin is distributed in a coarse meshwork through 
the substance of the nucleus, showing usually some tendency 
to become concentrated on the nuclear wall. 
Division of the Active Form. 
The process of division seems to be always longitudinal. 
The first indication of division is usually seen in the division 
of the blepharoplast complex, but as the two new blepharo- 
plasts may remain in close contiguity during the early stages 
of this process, the first obvious sign of division is given by 
the outgrowth of the new chromatic line (PI. 12, figs. 36, 37). 
The new chromatic line in Trichomonas Eberthi always 
grows out parallel and in the same sense as the old line, and 
there is no trace of the chromatic band joining the blepharo- 
plasts which was so characteristic of the dividing forms of 
Trichomonas gallinarum. 
The new membrane is formed as an outgrowth down the 
new line (PI. 12, fig. 40), but the behaviour of the free 
flagella during division is a little more difficult to under- 
stand. 
As has been previously pointed out, the vast majority of 
active Trichomonas Eberthi bear three free anterior 
flagella. In the division of these forms it seems probable, 
from a study of stages resembling PI. 12, fig. 40, that two of 
the old free anterior flagella pass in the division of the 
blepharoplast complex to the moiety of the blepharoplast 
which gives rise to the new chromatic line, the other free 
