952 D. WARD CUTLER 
studied these parasites’. One is thus driven to the belief 
that the food is incorporated into the body at the posterior 
region, though the method is still unknown. 
MorpHouoey. 
P. pristina is a relatively large animal, its length varying 
from 133-9-259-2 4 with a breadth of 60-5-111:2y. The 
average size may then be taken as 226-3-99-9 ». In stained 
preparations it is evident that the whole of the body flagella 
are arranged in longitudinal series (PI. 10, fig. 1). The extreme 
posterior end is, however, naked, and in many preparations 
there can be seen a collection of darkly stained bodies, triangu- 
larly arranged with the apex directed anteriorly (PI. 10, fig. 2). 
These granules are not to be found in every specimen and 
are irregular as regards size, never attaining, however, to that 
of the numerous food particles formed in other regions of the 
body. From their general appearance and from the fact that 
they are always confined to the naked posterior region of the 
body, it seems possible that they are of an excretory nature 
and that this naked region may be regarded as the physio- 
logical anus of the animal. This is, however, a pure conjecture, as 
IT have found no evidence of granules being ejected from this 
region of the body. 
Cell Inclusions. 
In preparations fixed by Fleming, as modified by Gatenby (5) 
and then stained by Heidenhain’s iron haematoxylin, there 
are seen, Scattered through the entire plasma, numerous short 
deeply-stamed rods of a fairly uniform size and thickness 
(Pl. 10, fig. 6). In appearance these bodies are very similar to 
those found in Ditrichomonas termites and deseribed 
in a previous paper (2). On the other hand they in no way 
resemble the cytoplasmic inclusions found in the various 
animals investigated by Gatenby (5). As I have been unable 
to carry out any of the tests requisite for an accurate deter- 
mination of the various cell inclusions, I shall content myself 
with simply recording their presence in Pseudotricho- 
nympha pristina. 
