34 
Trematodes of North Queensland 
The testes lie adjacent to the posterior border of the ventral sucker 
and very nearly on the same level. The right testis is transversely oval 
and measures 0-09 x 0-15 mm. The left testis is apparently abnormal, 
as it is very much compressed and considerably smaller than the right 
testis. 
The ovary lies 0-1 mm. behind the ventral sucker. It is nearly 
median and has an irregularly rounded outline. It measures 0-15 
X 0-18 mm. On each side and behind it he the yolk glands which form 
processes of moderate length. They are fairly straight and markedly 
transverse in direction. There are three processes on the right and 
four on the left. 
The uterus is poorly developed. It forms only a few windings in 
the middle of the body and does not enter the appendix. The eggs 
are remarkably broad, measuring 0-028-0-030 x 0-022-0-023 mm. 
The terminal male genitalia do not quite resemble those in Ectenurus 
lepidus, the type of the genus. The pars prostatica is relatively longer, 
the vesicula seminalis more slender, while the duct connecting the 
vesicula with the prostate is shorter. The resemblance, however, 
appears to be sufficiently close to permit of the inclusion of this species 
in the genus Ectenurus. The genital aperture lies over the pharynx. 
The cirrus-pouch is about 0-15 mm. in length and cylindrical in shape. 
The pars prostatica is 0-25 mm. in length and the prostatic cells are 
very closely apposed to it. The long, narrow vesicula is bent to form 
a right angle. No division into three parts could be detected. The 
posterior end of the vesicula does not quite reach the posterior border 
of the ventral sucker. 
The species differ from E. lepidus chiefly in the structure of the 
terminal male genitalia and in the size of the ova. 
Genus Xenopera n. g. 
Xenopera insolita n.sp. 
(Plate IV, fig. 8.) 
Five specimens of a rather peculiar parasite were collected from the 
rectum of a bream {Sparus australis). 
It is an elongated, sub-cylindrical form with a pedunculated ventral 
sucker. The length of the body is 2-2-5 mm. and the maximum 
breadth, which occurs near the posterior end, is 0-6 mm. The breadth 
of the neck is only 0-2 mm. There is no appendix or ecsoma and the 
cuticle is unarmed. 
