370 
Trematodes 
The yolk glands are extensive but not very voluminous, a condition 
due perhaps to the immaturity of the specimens. They are entirely 
lateral and extend from the level of the pharynx to near the posterior 
end of the body. They overlap the intestinal diverticula throughout 
their whole extent but do not encroach upon the ovary or testes. In the 
post-testicular space the glands on either side remain entirely separate 
and they leave a considerable part of the space unoccupied. The follicles 
are small and scattered. 
In the few specimens which contained eggs they occupied a position 
to the left of the ovary and the ventral sucker. There was only a small 
number present in any one specimen and they varied greatly in size, 
the limits in length being •036--048 mm. and in breadth •021--029 mm. 
The most normal looking eggs measured •042--048 x -027 mm. 
In spite of its immature condition it is obvious that this parasite 
differs considerably from the already known species of the genus Brachy- 
saccus (B. anartius and B. symmetrus Johnston 1914). From both it 
differs in having the ventral sucker decidedly larger than the oral. 
The cirrus-pouch is miich larger comparatively, while the ovary and 
testes are much more closely together. It is possible, however, that 
with the development of the uterus the testes may be pushed further 
apart from the ovary and from the ventral sucker and so assume a 
relative position more nearly approximating that in Brachysaccus 
anartius. The yolk glands are more scattered and extensive than those 
in B. anartius and differ entirely from those in B. symmetrus. 
. Genus APTORCHIS Nicoll. 
Aptorchis aegtualis Nicoll. 
A further half-dozen specimens of this parasite were obtained from 
the intestine of a freshwater turtle {Emydura australis). They agree 
in most particulars with the single specimen already recorded from 
Emydura latisternum (see Nicoll 1914). The present specimens, how¬ 
ever, are larger, measuring up to 3-65 mm. in length by T15 mm. in 
maximum breadth. 
The oral sucker measures 0-2-0-28 mm. in diameter and the ventral 
0-31-0-6 mm. The latter is situated at a distance of 0-85-1-48 mm. from 
the anterior end. 
In an average specimen the measurements would therefore be some¬ 
what as follows; length 2-8 mm., maximum breadth 0-87 mm., diameter 
