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Intestinal Protozoa in Termites 
species, T. campanula, harboured by Termopsis in North America, and its 
structure and mode of multiplication were discoursed in detail. 
In papers which appeared in earlier years, the generic name Trichonympha 
was erroneously applied to various forms with quite different characteristics. 
For instance, a form briefly described by Kent (1885), shortly after the 
appearance of Leidy’s work, and named T. leidyi, is doubtless a member of 
another genus. More recently, this generic name was applied by Hartmann 
(1910) to the organisms—“T.” hertwigi —harboured by Brazilian termites. 
But these present peculiarities proper to more than two other genera, and 
Grassi soon established two new genera for them. 
Forms belonging to this genus are found in Leucotermes of both Japan 
proper and Formosa. Our forms show a rather close resemblance to T. agilis, 
described by the American authors, but some points of difference are definitely 
recognizable among them. There are, moreover, some distinct differences 
between those of Leucotermes speratus of Japan proper and those of Leuco¬ 
termes Jlaviceps of Formosa. The differences found among the three forms, 
however, are not judged to be sufficiently great to make them separate 
species, and I propose to treat our forms as varieties of the American species, 
calling them T. agilis var. japonica and var. formosana. 
(1) Trichonympha agilis var. japonica var. nov. (Plate X, figs. 1-4). 
The body assumes an oval shape, slightly narrowed at the anterior end 
and evenly rounded at the posterior. The dimensions are usually 70-90 g in 
length, and 40-70 g in breadth. The body is clearly differentiated into anterior 
and posterior regions (“head” and “body ” according to Leidy’s terminology). 
The front end of the former is drawn out into a nipple-like prominence. The 
anterior region, occupying some one-fourth of the whole length, is quite 
different in structure from the rest of the body; its wall being remarkably 
thick, and its endoplasm seeming denser, so that no marked changes in shape 
are observed in this region. In the posterior region, on the other hand, the 
body wall is not so thick and the endoplasm appears less dense, so that it 
is rather metabolic. Porter called the anterior eminence the “nipple” and 
the rest of the “head” the “bell-shaped region,” or simply the “bell." The 
terms “nipple” and “bell” will be used in this paper. In Trichonympha 
agilis, the anterior region is of about the same length as the posterior, or a 
little shorter; that is to say the bell is markedly larger than that of our variety. 
In T. campanula the bell is still larger. 
One of the conspicuous features of the forms of this genus is the coat of 
flagella, thickly distributed on the anterior region. They are very closely set 
on both the nipple and the bell, excepting only the specially differentiated 
anterior tip. These flagella are directed backwards and increase in length 
towards the boundary of the anterior and the posterior regions. The longest 
ones attain so remarkable a length as to extend beyond the posterior extremity 
