368 
S. J. JOHNSTON. 
on the right side near its middle. The testes are very large, 
about 2 mm. by 0'94 mm., with deeply lobed outline, and lie 
just behiud the junction of the third and the last body fourths. 
They lie side by side, one on each side of the middle line, 
with their long axes obliquely placed, so that while their 
posterior ends are near together their anterior ends are some 
distance apart. Between the testes, within the bay formed 
by their divergence, the ovary and shell-gland lie, near the 
middle line. 
The two vasa deferentia, arising near the middle of the 
anterior surface of each testis, meet just in front of the ovary 
to enter the vesicula seminalis. The latter is of extraordinary 
length and pursues a tortuous course, never far from the 
middle longitudinal line of the body, through half the animaTs 
length. It occupies a position dorsal to the coils of the uterus. 
Only a comparatively small part of it lies within the cirrus sac, 
which is a cylindrical, muscular tube (figs. 24 and 25) running 
pretty straight through the anterior fourth of the body. 
Arrived in the posterior end of the cirrus sac the vesicula 
seminalis soon gives place to the ejaculatory duct, traversing 
the muscular penis. The proximal end of this ejaculatory 
duct is surrounded by a conspicuous pi-ostate (fig. 25), which 
causes the cirrus sac to be much wider behind than in front. 
The penis and sac are of very unusual length compared to 
their d ia meter. 
The ovary is a smooth-edged, oval body of considerable size, 
0’89 by 0*57 mm., though much smaller than the testes. The 
‘‘ shell-gland,’’ which lies alongside, is also very large, 0‘82 by 
0*49 mm. The oviduct, after traversing this organ, begins a 
series of transverse windings that run on as the uterus, in the 
form of a tube of comparatively narrow bore, but very great 
length. The very numerous coils of the uterus lying close 
together run from side to side in the ventral part of the body. 
Situated ventral to the vesicula seminalis, intestinal limbs and 
main excretory vessels, they fill up all this part of the body 
from the gonads behind to the level of the meeting of the first 
and second body fourths. From this point the vagina runs 
