ox SOME QUEEXSLAXD TREMATODES. 
387 
Type-specimen in the Museum of the Australian Institute 
of Tropical Medicine, Townsville, Xo. T. 38. 
Co-type in the Australian Museum, Xo. AV. 368. 
In size this species is 6 mm. long by 2‘3 mm. broad, the 
greatest width being some distance behind the ventral sucker. 
The body is narrow in front of the ventral sucker, with fairly 
parallel sides ; the part posterior to it is oval in shape. The 
integument is thick and wrinkled, but no spines are present. 
As is usual in the group, the suckers are very large and 
strong, the longitudinal and transverse diameters of the oral 
sucker being 0*46 mm. and O’ 58 mm. respectively, while those 
of the ventral sucker are 0’847 x 0’978 mm., the ratio of the 
oral to the ventral being 1 : T8. The suckers are T3 mm. 
apart. 
The pharynx is a conspicuous structure, but not so large as 
the oral sucker, measuring O’o42 x 0*265 mm. The oesophagus 
is very short, almost non-existent, while the intestinal limbs, 
which are somewdiat voluminous, especially posteriorly, do not 
reach the posterior extremity by a distance of 1 mm. 
The excretory vesicle may be described as V-shaped, and 
consists of two wide tubes extending from the level of the 
oral sucker to the extreme posterior end, where they are 
joined together by a short, transversely placed, triangular 
chamber which opens on the exterior at the posterior end. 
This part is surrounded by a mass of deeply staining cells. 
The two main limbs run at first along the inner side of the 
intestinal limbs. At the level of the testes they cross the 
intestine and proceed forwards, close to the sides of the body. 
The genital pore is a little to the left of the middle line, 
just behind the pharynx. The two testes are almost sym- 
metrically placed, one slightly in front of the other, and lie 
within the intestinal limbs. They are round or oval in 
shape and smooth-edged, 0’456 mm. in diameter. The vasa 
deferentia, after an elongated course, meet at the base of the 
vesicula seminalis, which lies wholly within the cirrus sac and 
is somewhat coiled. The prostate is well developed, and the 
penis large and thick. The cirrus sac is oval in shape, and its 
