210 FRANK E. BEDDARD. 
bundle which is inserted upon each of the two atria just in 
front of the point where they become fused. On the opposite 
side of the male pore is a bundle of muscular fibres running 
longitudinally. The total effect of the contraction of all these 
muscles, as it appears to me, would be the protrusion of the 
terminal apparatus of the male organs. I think that any of 
these muscles could play the part of retractors when the 
terminal sac is protruded ; they could, I should imagine, serve - 
both as retractors and protractors, according to the position 
of the organ. 
The ovaries are in the 13th segment ; they are unenclosed 
by any sac; the oviducts opposite to them open partly into the 
cavity of the 13th segment and partly into the egg-sac. In the 
independence of the ovaries, egg-sacs, and spermatothecal sac, 
the present species agrees with other Eudriloides. 
The spermatothecal sac is much like that of Eudri- 
loides brunneus; it opens on to the 13th segment and ex- 
tends a little way in front of its external pore and reaches for 
some way behind it—as far as the 17th segment. I have 
studied the minute structure in a nearly mature specimen (quite 
mature except as regards the clitellum), and in a much younger 
specimen. The part of the spermatothecal sac lying in front 
of the aperture is not in any way different in structure from 
the rest. The walls of the sac are much thinner posteriorly 
than anteriorly ; they are lined by a layer of large cells which 
are covered externally by a muscular coat; at the pore the 
structure is a little difficult to understand; it is shown in 
fig. 16. I could find no actual orifice, perhaps to be accounted 
for by the worm not being fully mature. The epidermis is 
thin just below the pouch and the muscular layers of the 
body-wall have disappeared. ‘The spermatotheca is lined by 
the thick layer of cells referred to. ‘These get so close together 
where the lumen narrows towards the pore that the lumen is 
entirely obliterated. It may be that this arrangement of the 
cells means that the protrusible termination of the male 
efferent apparatus can be thrust into the spermatotheca, but 
that the sperm cannot escape from the sac. The ventral half 
