ON THE TRYPANOSOME OF THE LITTLE OWL. 
175 
shows, it will be noticed, the curious chain of granules 
running parallel to the flagellar border, which was frequently 
observed in the case of the corresponding forms of T. 
fringillinarum. The smallest trypanosome of this type 
which has been observed (fig. 29) also happens unfortunately 
to be on a thin blood-smear, 1 and is leaf-like. It is only 
23J g long, the free flagellum being 6J n, and it appears 
to be as much as 6J g wide ! Individuals as small as this are 
very exceptional ; the majority appear to be of much the 
same size, having an average length of about 30 fi, and not 
differing greatly from the dimensions given above. 
Comparing now this type of form as it occurs on wet films, 
we find, as already indicated, that all the parasites are fairly 
uniform in size and appearance. They show well the typical 
thick, fusiform shape of the body. They also exemplify 
another important point, namely, the considerable shrinkage 
in size which is undergone by the trypanosomes in the course 
of preparing the wet films. The total length averages about 
23/4, the individual of fig. 42, for instance, being 25 fi 
long by 4 \ jjl broad, while that of fig. 41 is 2(H /4 by 3f /u. 
We have no hesitation in comparing these forms with 
the average-sized ones of the dry series — say, for instance, 
figs. 13 and 30 respectively. It might be thought, perhaps 
that the parasites of figs. 40-42 corresponded rather to 
the very small individual of fig. 29. We certainly do not 
think so. We have only found such a small form in that one 
case, the average size being considerably larger (longer), and 
the wet films were made at the same time as the Romano Wsky 
ones. Further, as was shown above, there is relatively quite 
as great shrinkage in what are undoubtedly medium-sized 
slender forms an’d large “blue” ones (i. e. types found in 
the earlier birds) on wet films. 
A feature in which the stout spindles differ markedly from 
the slender small forms is the much larger size of the tropho- 
1 On one oj* two thick blood-smears which were made, nearly all the 
parasites have the more typical form, only a few individuals in the 
thinner parts tending to be flattened out. 
