206 
The Irish Naturalists 
October 
the vas deferens (v.d.) convoluted above, runs downwards^ 
along with it, and appears to terminate at or near the 
junction of the organ X with the atrium : on the opposite 
Fig. 2. — The organs of V. hibernica, after Taylor and Simroth. 
side of the atrium opens the organ Y. According to Simroth- 
Taylor, an outline of the relevant parts of whose figure 
is shown in figure 2, the vas deferens (v.d.) does in fact 
end at its junction with X into which it opens " about 
midway " : X is identified as the penis, and Y as a " dart 
gland." According to Bowell (see figure 3) the organ 
Fig. 3. — The organs of V. pyrenaica, after Boweh. 
X is a dilatation of the vas deferens (v.d.) in the form of a 
sigmoid flexure ; its cavity does not open into the atrium 
but is continuous with a lower section of the vas deferens 
^ i.e. towards the genital orifice. 
