ON SOME QUEENSLAND TREMATODES. 
393 
The intestinal limbs are nnbranclied, bnt are thrown into a 
number of snake-iike undulations. 
The genital pore is in the middle line, midway between 
the intestinal fork and the anterior edge of the ventral 
sucker. The vesicula serninalis and cirrus sac are short, aiid 
smaller than in P. polycladum. 
The testes consist of about fifty small rounded follicles on 
each side, 0T07-0‘129 mm. in diameter, and lying more or 
less dispersed from one another, in the region between the 
intestinal limbs aud the lateral edges of the bod 3 ^ ddie 
ducts from the separate follicles join up in groups of five or 
six and enter a main longitudinal vas deferens on each side; 
these two vessels join one another at the base of the vesicula 
serninalis. 
The ovary (0’375 by 0*244 mm.) is comparatively small, and 
is mulberi’y shaped. The receptaculum serninis is much 
larger*, 0*73 x 0*57 mm. 
The yolk-glands, on each side, consist of a much-branched 
tube rather than of follicles, and, while lying further apart 
than in P. polycladum, do not stretch outwards beyond 
the inner limit of the intestinal limbs. The extension of the 
uterus also coincides with that of P. polycladum. The 
eggs are larger, and especially broader tliari in the last-named 
species, being 0*06 — 0*064 in length by 0*03 mm. broad, and 
many of them are seen to be provided with a short spike at 
one end. 
Only a single specimen of this worm was obtained from 
its host, the leopard ray, Dasybatis kuhlii, where it 
occurred in the body-cavity. 
From the Australian Institute of Tropical Medicine and 
the Biological Department of the University of Sydney. 
Literature. 
1. Arnsdorff, A. — “ Mono sto mum vicarium n. sp.” ‘ Centraib. 
Bakt./ vol. xlvii, 1908, p. 362. 
2. Beneden, P. J. van. — “Memoir snr les Yers intestinaux,” ‘ C.R. 
Acad. Sc. Paris,’ 1858, Supplement. 
VOL. 59, PART 3. NEW SERIES. 25 
