Trichostrongyle Genus from an Armadillo. 415 
The small oral aperture leads direct into the cesophagus, 
there being no indication of a mouth-capsule. ‘he ceso- 
phagus (fig. 1 a) is straight, elongate, and slightly thickened 
posteriorly, measuring on an average about 450 w long and 
50 w at its broadest part. 
The nerve-ring is situated slightly in front of the middle 
of the cesophagus. 
The position of the excretory pore does not appear to be 
constant, in that in some specimens it was situated at the 
level of the hind end of the cesophagus, whereas in others it 
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a, Anterior portion of Trichohelix tuberculatum (Parona and Stossich, 
1901). 6. Head, much enlarged. 
E.P.=excretory pore; N.#.=nerve-ring ; H.P.=head-papilla. 
was pushed slightly forwards; the latter position, however, 
is the more common (fig. 1, a). From the pore the excretory 
duct passes almost vertically inwards, and on reaching the 
cesophagus bends abruptly backwards. 
The bursa (figs. 2 and 8) is short and broad, and is about 
three times as broad as it is deep ; posteriorly it is slightly 
notched in the mid-line, and a shallow depression on each 
side gives it a slight trilobed shape. 
Of all the bursal rays the dorsal is the stoutest. This ray 
measures about 50 mw broad at its base and is about 200 uw 
long. After the origin from it of the externo-dorsal rays 
it is only about half this thickness. About midway between 
the origin of the externo-dorsal rays and its tips it divides 
into two branches, and each of these latter is again split at 
its tip. Each inner terminal branchlet bears on its inner side 
a much thinner and parallel twig. 
