344 
Queensland Trematodes 
There is a distinct prepharynx, 04 mm. in length. The pharynx 
measures 0435 x 0405 mm. and the oesophagus 006 mm. The intes¬ 
tinal diverticula are short. They keep close to the ventral sucker and 
terminate a short distance behind it, the ends being obscured by the 
uterus. At the intestinal bifurcation the initial parts of the diverticula 
are somewhat swollen. 
The genital aperture is situated a little in front of the ventral 
sucker, over the left intestinal diverticulum. The cirrus-pouch is a 
long, slender and sinuous structure which extends a little beyond the 
posterior border of the ventral sucker. It was found impossible to 
make out with accuracy the details of its internal structure. There 
appears to be a somewhat capacious genital sinus. The testes lie 
exactly midway between the ventral sucker and the posterior end of 
the body. They are symmetrically situated, transversely oval in shape 
and are separated by a space of 024 mm. Their dimensions are 
041 x 048 mm. They are only slightly obscured by the uterus. 
The ovary lies midway between the ventral sucker and the testes. 
It is almost median, somewhat oval, and measures 040 x 043 mm. 
No receptacuium seminis could be detected. The yolk glands are 
entirely lateral and extend from a little behind the ventral sucker to 
the posterior end of the body where, however, they do not unite. They 
are slightly higher on the left than on the right. They extend in from 
the edges of the body a considerable distance and overlap the uterus in 
places. The uterus is very voluminous. Starting from the ootype, it 
passes back between the testes and forms a number of convolutions in 
the post-testicular space. Passing forward again it fills up the greater 
part of the body behind the ventral sucker. The numerous ova 
measure 0'028-0'031 x 0'018-0’019 mm. 
The inclusion of the two preceding forms within the family 
Lepodermatidae must be regarded as somewhat doubtful. They both 
depart from the typical arrangement in having the testes well nigh 
symmetrical, though in each there is a tendency for the left testis to be 
a little in advance of the right. This is barely perceptible in Aptorchis. 
The position of the ovary in the latter is also somewhat atypical, while 
the yolk glands have an unusual disposition. In Dolichopera the 
position of the uterus is unique. In spite of the large number of genera 
which have now been included in the family it is surprising that there 
yet appears no possibility of arranging them in sub-families. Practically 
no other family of Distomate Trematodes shows such a conflicting diver¬ 
sity of form and structure. 
