ON SOME QUEENSLAND TREMATODES. 
365 
lie at first close together, but gradually diverge till they come 
to occupy positions at the junctions of the middle with the 
lateral thirds of the body, when they run backwards parallel 
to the lateral body-edges till they reach the level of the testes. 
Arrived at the anterior faces of the testes they bend inwards, 
enclosing the ovary, but lying on the inner side of, and dorsal 
to, the testes. Between the posterior ends of the testes they 
lie very close together. Behind them they diverge in a 
circular curve on each side, and, keeping pretty close to the 
rounded posterior end of the body, become confluent in the 
extreme posterior end. In this circular part of their course 
behind the testes a few short casca are given off; otherwise 
they are unbranched and run fairly straight. They lie dorsal 
to the loops of the uterus. 
On the dorsal surface of the body, near the posterior end, 
there is a large circular or oval opening leading into a spacious 
chamber, in the floor of which the excretory pore lies. Nine 
tunnel-like, tubular spaces, arranged in an anterior and two 
lateral groups of three each, branch off from this chamber 
into the parenchyma of the body, which is here very thick, 
and in each tunnel there lies a thick cylindrical finger-like 
process. Each lies quite free in its tunnel except at its base, 
where it becomes continuous with the tissues of the body 
(fig. 20). The three in the anterior group are longer than 
the others. These processes are muscular and extensible, 
and are capable of being thrust out for a considerable distance 
through the opening on the surface of the body. Each pro- 
cess or proboscis is circular in transverse section (figs. 3 and 
23) and possesses a strong musculature. The circular fibres 
form a complete layer on the surface. Within this lies a 
circle of strong longitudinal fibres. Lying within the latter 
are found glandular cells which form rhabdite-lihe bodies and 
mucus or some similar homogeneous secretion. The cavities 
in which the processes lie are filled up, or partly filled up 
with mucus, which contains myriads of small rod-like bodies 
very similar to the rhabdites of Te m n ocephala and the 
Turbellaria. Each gland-cell is pear-shaped, and opens 
