122 
Queensland Trematodes 
0'21 x 0'27 mm. A short distance behind and a little internal to it 
lies a large receptaculum seminis measuring 0’22 x 0'29 mm. The yolk 
glands are lateral and almost entirely external to the intestinal diver¬ 
ticula. They extend from the level of the middle of the ventral sucker 
to a distance of 0 - 55 mm. from the posterior end of the body. They 
are thus considerably more extensive than in P. biliosum. The trans¬ 
verse yolk ducts cross the body at the level of the shell gland. 
The uterus is less voluminous than in P. biliosum and it does not 
obscure the intestinal diverticula to nearly the same extent. The 
convolutions are narrow and their arrangement displays a certain 
amount of symmetry. There is a large mass of light eggs lying between 
the receptaculum seminis and the posterior end of the body. In front 
of this there is a coil of loops, containing darker eggs, lying on each sid£ 
of the ventral sucker and a central smaller coil lying dorsal to the 
sucker. This extends forwards between the testes and forms a final 
group of convolutions in front of the testes. This final group is almost 
absent in P. biliosum. It may be added that at no place does the uterus 
approach the edge of the body so closely as it does in P. biliosum. 
The numerous ova measure O027 to 0'030 x 0 - 018 to 0'020 mm. 
The differences between these two species may be summed up as 
follows : P. jecoris is more slender than P. biliosum and has the ventral 
sucker placed near the centre of the body. The suckers are more nearly 
equal in size. The intestinal diverticula are longer and less sinuous. 
The genital aperture is not so far forward and the cirrus-pouch is 
shorter, the vesicula seminalis being much less convoluted. The 
testes are smaller and more transverse. The yolk glands are more 
extensive. The uterus is simpler and less extensive and the ova are 
slightly larger. In addition cuticular scales are absent and a large 
specialised gland is present around the genital aperture. 
The genus Platynotrema may be defined as follows : 
Dicrocoeliinae of medium size and of moderately flat broad shape 
and oval outline. Suckers fairly large and ventral sucker situated a 
short distance in front of the middle of the body. Intestine well 
developed; oesophagus present and diverticula long and sinuous. 
Genital aperture median near the intestinal bifurcation. Cirrus-pouch 
small and slender. Testes symmetrical, immediately in front of ventral 
sucker; large, irregular, crenated. Ovary immediately behind ventral 
sucker, small and simple. Yolk glands lateral, mainly behind the level 
of the ventral sucker. Uterus highly convoluted, mainly behind the 
ventral sucker. Ova 0’024 to 0'030 x 0‘015 to 0‘020 mm. 
