346 
Queensland Trematodes 
was somewhat asymmetrical, the glands on the right side extending 
farther inwards than those on the left. Their anterior limit is iust 
behind the intestinal bifurcation, and posteriorly they reach the 
posterior border of the testes. The yolk ducts cross and unite behind 
the ovary. The uterus fills up the posterior half of the body in the 
manner characteristic of the genus. It overlaps the intestinal diver¬ 
ticula, the testes and the ovary. The numerous eggs are small and 
measure 0'025-0‘03 x 0013-0017 mm., the average being about 0028 x 
0'015 mm. 
This species differs from P. ovatus in several respects, but chiefly in 
the size of the suckers. It bears more resemblance to P. cuneatus but 
differs from it in the greater extent of the yolk glands and in the some¬ 
what larger size of the eggs. The extent of the yolk glands along with 
other features differentiate it from P. anatinas and P. pellucidus. 
Family HOLOSTOMIDAE. 
Genus Hemistomum Diesing. 
Hemistomum brachyurum u. sp. 
(Plate XXIY, fig. 9.) 
A few specimens of this species were obtained from the intestine of 
a spotted owl (Ninox maculata). It is a small form measuring only 
T5-2 mm. in length with a maximum breadth of 0‘55-0'7 mm. Of the 
total length the anterior expanded portion comprises f. The “ tail,” or 
rather the posterior part of the body, is therefore considerably shorter 
than the anterior part. It is also much narrower, being only 0'35-0‘5 mm. 
in breadth. The edges of the anterior part of the body are well turned 
over and almost opposed along half their length. The surface of the 
expanded portion is covered with tiny spines. 
The small oral sucker has a diameter of 0 - 06 mm.; the ventral 
sucker measures 0T05 mm. and is situated at a distance of 057 mm. 
from the anterior end, i.e. exactly in the middle of the anterior part of 
the body. The adhesive disc has a diameter of 0‘23-0‘30 mm. and is 
separated from the ventral sucker by a space of 0‘05 mm. It is elevated 
about 0'13 mm. above the surface of the body. 
The pharynx is contiguous with the oral sucker and measures 
0‘05 x 0'037 mm.; the oesophagus is 0'066 mm. in length and the 
intestinal diverticula extend right to the posterior end of the body, not 
diverging very far from the median line at any part of their course, In 
