372 
Trematodes 
There is a long delicate prepharynx, with a small pharynx, followed 
by an oesophagus of nearly the same length as the prepharynx. The 
intestinal bifurcation is at a distance of 0-34 mm. from the anterior end 
of the body. The intestinal diverticula are long and narrow and extend 
to near the posterior end. 
The excretory vesicle is a conspicuous and characteristic structure. 
It is Y-shaped with a short wide median stem and branches which 
diverge at a wide angle. The latter are about half as long as the main 
stem. The vesicle separates the testes which lie in the angles formed by 
the main stem and its branches. 
The genital aperture is median and lies about 0-065 mm. in front 
of the ventral sucker. The cirrus-pouch is relatively large and has a 
somewhat sigmoid shape. It is stoutly built and contains a simple 
oval vesicula seminalis, a well-marked elongated oval pars prostatica 
and a short wide ductus ejaculatorius. The pouch lies over and around 
the left border of the ventral sucker and its total length is about 0-2 mm. 
The testes lie near the posterior end of the body between the excretory 
vesicle and the intestinal diverticula. They are symmetrically situated 
and oi oval outline, their long axes being oblique. They measure about 
0-08 X 0-05 mm. 
The ovary lies a short distance behind the end of the cirrus-pouch 
and a little to the left side. It is a transversely oval body with a long 
diameter of ()-085 mm. Immediately behind it lies a small receptaculum 
seminis. The yolk glands are well developed and extend from the pos¬ 
terior end of the body forward to a considerable distance (0-07 mm.) 
in front of the level of the genital aperture. They are, for the most part, 
marginal, but in front of the genital aperture they stretch inwards and 
usually form a continuous band across the body. In some cases they 
do not quite unite. The follicles are small and rather scattered. 
The uterus is short and contains only a few eggs which lie between 
the ovary and the genital aperture, chiefly on the right side. They 
measure 0-031 x 0-015-0-016 mm. 
Genus ACANTHOCHASMUS Looss. 
Acanthochasmus quaesitus sp. inquir. 
Over two hundred specimens of a species of Acanthochasmus were 
taken from the intestine of a crocodile {Crocodilus johnstoni) which was 
killed at Armadale, North Queensland. Unfortunately a considerable 
time had elapsed before the animal was brought for examination and 
