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A part of the mucous membrane from the ventricle of a rat enclosing the
Spiroptera, when seen under the mieroscope first of all presents the winding passage
in which the worm is placed. Scattered round the worm eggs will be found in the
epithelium. It probably may be beyond doubt that the pairing takes place in this
passage in the mucous membrane, as the worm does not leave its place here in order
to seek refuge in the lumen of the stomach. To be sure, it may sometimes be ob-
served projecting into the lumen with a shorter or longer part of its body, but
no specimen has been found free in the stomach. Sometimes two specimens are found
in the same passage, a male and a female. They are then placed quite near to each
other, the front part being turned in the same direction. However, a pairing never
is observed although a case as the one just described may probably be explained as
the introduction ; or possibly the pairing itself may have taken place.
In the mature female eggs are constantly evacuated through the vulva; the
vagina as a rule contains eggs in the aet of leaving the worm. Round the female the
epithelium of the stomach of the host is seen to contain eggs. When by desquamation
of the epithelium, afterwards passed into the lumen of the stomach, the eggs are mixed
with the contents of the latter and fmally evacuated with the excrements, in which
on microscopical examination they are easily found.
The egg is very regularly egg-shaped, thickest in the middle and evenly tapering
towards the poles; its maximal diameter is about 60//, the minimal being about 40//.
In Optical sections the shell is found somewhat thickened at the poles, in this respect
the egg is quite similar to that of Spiroptera obtusa as figured by Iæuckart. The shape
too resembles that of the latter. See Leuckart: Die menschhchen Parasiten II
fig. 85 p. 113, and present paper PL I fig. 8.
Under high magnifying power the e%^ presents a distinct line of demarcation be-
tween the thinner middle part of the shell and the thicker field at the poles; which
seems to be of great consequence when the young ones are
about to leave the egg. In the uterus, however, all stages of
development are present; in ripe eggs the larva is found coiled
up; at this stage it is thickest in its front end, decreasing
evenly in width towards the tail.
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| Fig. 2. |
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