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In the female the vulva is situated rather near the tail. In a female of 2^/2 ctm.
having reached its maturity, the vulva is placed 2,5 mm, from the tip of the tail;
in a female of about 6 ctm, the distance from the vulva to the end of the tail is
7 mm. In a female of 3,6 ctm, the vulva is situated almost 4 mm. from the tip
of the tail, It is very difficult to obtain absolutely exact measurements ; in the first place
preparations of females tolerably extended are found but very seldom; as a rule they
will be considerably curved, bending from one side to the other and — which is
still worse — in several cases twisted. Secondly, even exact measurements may not
be in keeping with the facts on account of the great power of contraction met with
in this species, as the measurements will vary according to the momentary state of con-
traction. Generally, however, the distance from the vulva to the tail may vary between
^/s and ^/lo of the whole length of the animal.
It is no easy task to fix the place of the vulva; the two uteri are extending
far forwards and backwards in the body and often — especially in bigger specimens —
are fiUed with eggs to such a degree that the whole cavity of the worm may
be taken up by these organs, the intestinal canal and the ovaries being forced aside;
as the vulva is but little prominent itself it often may take a long time to find it.
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| Fig. 1. |
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