26 
Trematodes of North Queensland 
length. They are tandem and contiguous. In outline they are roughly 
oval with a slight concavity on their anterior border. The margins 
are irregularly crenated. They measure about 0-28 x 0-46 mm. 
The ovary lies on the right immediately in front of the anterior 
testis, with which it is contiguous. It is a small oval body measuring 
0-12 X 0-19 mm. There is no receptaculum seminis but Laurer’s canal 
is present. The yolk glands are chiefly lateral and extend from the 
level of the ventral sucker to the posterior end of the body where they 
fill the post-testicular space. They extend inwards over the intestinal 
diverticula and overlap the testes to some extent. The uterus lies 
between the ovary and the ventral sucker. The ova, which are few in 
number, measure 0-081-0-084 x 0-042-0-043 mm. 
It is difficult to place this species in the system. It bears a superficial 
resemblance to the Allocreadiidae but the absence of a cirrus-pouch 
and the condition of the intestinal diverticula appear to exclude it from 
that family. 
Genus Aephnidiogenes n. g. 
Aephnidiogenes barbarus n. sp. 
(Plate IV, fig. 3.) 
About a dozen specimens of this parasite were obtained from the 
intestine of a large grunter {Poniadasis liasta). It is an elongated flat 
species of almost uniform width and with rounded ends. In several 
specimens a shght constriction was noticed at the level of the oesophagus, 
but this does not appear to be a constant feature. The thick cuticle in 
the anterior two-thirds of the body is covered with minute spines. 
The length of mature specimens is 4-5-5 mm. Specimens under 
4 mm. in length contain no ova, or only malformed ones. The maximum 
breadth which occurs at the level of the testes is 0-75-1-0 mm. The 
margins of the body are very lightly wrinkled. 
The oral sucker is usually sub-terminal, though in contracted 
specimens it may be terminal. Its diameter measures 0-27-0-31 mm. 
The ventral sucker, which is situated one-fifth of the body length from 
the anterior end, is transversely oval and measures 0-19 x 0-21 mm. 
The sucker ratio is, therefore, rather less than 3 : 2. 
The pharynx is contiguous with the oral sucker and has a somewhat 
square outline. Its length and breadth are both about 0-12 mm. 
The oesophagus is short, rarely exceeding the pharynx in length. Its 
average length is about 0-075 mm. The intestinal bifurcation forms 
rather an acute angle and the diverticula maintain a position at some 
