to discover in entire specimens, but clearly saw in a series of sections 
The receptacle represents in the sectioned specimen a globular bmi\ 
of about the same size as the ovary (0*4 mm. in diam.) and lying close 
to its dorsal surface. It communicates with the LAURKR S canal by a 
distinct thin duct, but does not contain many spermatozoa, a fact 
which renders the seminal receptacle very transparent in unstained 
specimens. This insufficient filling in combination with the p •rticiilar 
position of the seminal receptacle is obviously the reason why it 
escapes observation in entire worms. 
The yolk-glands are only little developed; they are composed 1 
rather numerous acini of a slender club shape collected into in<<n- r 
less distinct groups, the number of which seems to van- between ten 
and twelve. In extended specimens the groups lie in a nearly straight 
line one behind the other and are fairly well discernible ; in contrai ><d 
individuals they become more closely packed together and s<vin- >'{ 
them— especially those in the middle — may be shifted lateral!', in sm b 
a way that for a certain distance there appear to be two irregularly 
alternating rows of groups. In this latter case some of the follicle', 
are pushed below the intestinal caeca, otherwise, the yolk -gland'; le¬ 
as a whole between these and the body margin, usually the gland on 
the side of the ovary somewhat farther in front than that of thr 
opposite side. Their extent varies a little individually and ' ' 
the contraction of the body. In the greater number of specimens thrv 
commence somewhere at the outer border of the testicles and thru- 
posterior ends lie halfway between the posterior border of the ventr d 
sucker and the base of the tongue-like end-portion of the body, but 
may in strongly contracted specimens also be found further lop.'.a d 
The transverse yolk-ducts originating, on each side, by the union of 
an anterior and a posterior tributary arise from the glands r 
about their middle; they join near the ovary (the left transverse yolk 
duct being thus shorter than the right) and then enter the con plrv 
of the shell-gland from behind. There is no distinct w idening of tin 
unpaired part of the yolk-duct into a yolk reservoir The coils oi tin- 
uterus are very numerous but do not, as a rule, appear to the ob-erver 
m the shape of regular loops, but rather as loose tubes branching and 
sometimes anastomising in an irregular manner. Occasionally only, 
i.e. in individuals in a certain state of contraction, one may pern - 1 
the picture which is so characteristic of the uterus of Diet (oclvr 
