112 
Queensland Trematodes 
The oral sucker has an average diameter of 0T1 mm. The ventral 
sucker measures 0'34 x 0'27 mm. and it is situated at a distance of 
0'74 mm. from the anterior end of the body. The neck is therefore 
about one-eighth of the length of the body. 
The pharynx, which is contiguous with the oral sucker, measures 
0T1 x 0’09 mm. The oesophagus extends half way to the ventral 
sucker and the diverticula pass out widely round it. The genital 
aperture lies over the intestinal bifurcation. The cirrus-pouch is plump 
and extends back to about the middle of the ventral sucker. The ovary 
is situated about T8 mm. (i.e. one-third of the body length) behind 
the ventral sucker, but there is considerable variation in its position. 
It is a small transversely oval body measuring 0’2 mm. in greatest 
diameter. The anterior testis is separated from the ovary by a space o£ 
0'4 mm. It is an elongated oval body with pointed ends and measures 
0 - 55 x 0'25 mm. The posterior testis is usually almost contiguous with 
the anterior testis but is sometimes separated from it by quite a consider¬ 
able distance. It has a similar shape but is slightly smaller. The post- 
testicular space comprises about one-sixth of the body length. 
The yolk glands extend from a short distance behind the ventral 
sucker to near the tip of the tail. They are moderately well developed 
and do not unite in the post-testicular space. The uterus occupies the 
usual position and the eggs measure O' 100 to O' 115 x 0'052 to 0'056 mm. 
This species is rather like E. elongatum Nicoll but is distinguished 
from it by its small head and the more delicate texture of the body. 
Echinostomum hilliferum n. sp. 
(Plate VI, fig. 6.) 
Four specimens of this large Echinostome were obtained from the 
duodenum of a bald coot (Porphyrio melanotus). Of a deep brick red 
colour, the body measures 14'5 to 16 mm. in length. It is thick and 
fleshy with the margins thrown into irregular wrinkles. The maximum 
breadth occurs a little behind the ventral sucker and measures 1*7 to 
2'2 mm. The breadth of the head, which is moderately well expanded, 
is l'l to 1'2 mm. 
The cephalic spines number 47, and comprise the usual end groups 
of five each with 37 marginal spines arranged in two unbroken rows. 
In the end groups there are two large spines overlying three smaller 
ones ; the former measure 0T54 x 0'05 mm., the latter O' 10 x 0'04 mm. 
The marginal spines are intermediate in length and measure on an 
