124 Queensland Trematodes 
distance from the tip of the tail. They leave a clear space in the middle 
of the body. 
The small retort-shaped cirrus-pouch lies on the right of the ovary 
and anterior testis. It contains a comparatively large convoluted 
vesicula seminalis and a short pars prostatica. The genital aperture lies 
at the level of the anterior testis and to the right of it. The uterus 
contains only a few eggs which measure 0T05 to 0T1 x 0 - 066 mm. 
The opercular pole of the eggs is distinctly truncated. 
MONOSTOMATA. 
Family Cyclocoelidae. 
* 
Haematotrephus consimilis n. sp. 
On two occasions a few Monostomes were found in the thoracic cavity 
of the spur-wing plover ( Lobivanellus lobatus). They bear an exceedingly 
close resemblance to Haematotrephus similis Stossich, a Monostome from 
Himantopus atropterus, and are only separable from the latter species 
by very minor differences. 
The specimens measure 10 to 12 mm. in length and about 2 mm. 
in maximum breadth, which occurs towards the rounded posterior end. 
The breadth narrows very gradually towards the anterior end. The 
general body colour is light yellow with two lateral stripes of a reddish 
colour marking the course of the intestinal diverticula. 
The oral cavity is somewhat different from that in H. similis. It 
presents the appearance of a globular cup almost resembling an oral 
sucker. This cup is surrounded by a considerable mass of muscle 
fibres but there is no external limiting membrane. From this cup a 
short narrow prepharynx leads into a muscular pharynx of about the 
same size as in H. similis. The oesophagus is shorter than the pharynx 
and in some cases appears to be almost absent. The intestinal diver¬ 
ticula are moderately wide and run at some distance from the margins 
of the body. 
The genital aperture is situated at the posterior border of the pharynx. 
The cirrus-pouch is about the same length as that of H. similis but is 
somewhat stouter. The testes and ovary are somewhat variable in 
size and position. In this respect they agree with H. similis but the 
testes are always smaller than in that species. 
In the yolk glands the chief specific feature is to be found in so far 
as they extend forward to the level of the middle of the pharynx, whereas 
