390 
S. J. JOHNSTOX. 
The genus is closely related to Probolitrema Lss., 
differing from it principally in the fact that its yolk-glands 
are close together, within the space bounded by the 
intestinal limbs, while in the latter the yolk-glands are far 
apart and lie in the lateral part of the body quite outside the 
intestinal limbs (Looss, 33 , pp. 860 and 863, and Monticelli, 
42 , tav V, fig. 52). It differs from Anaporrhutum 
Ofenheim in the testes being wholly outside the intestinal 
limbs. 
Pet alodistomum polycladum,^ sp. n. (Fig. 13.) 
Diagnosis. — Under middle size, petal-like, with the 
posterior part of the body almost circular. Patio of oral 
to ventral sucker 1 : 1*6. Branched intestinal limbs. 
Genital pore at the level of the intestinal fork. Testes 
very large and more or less compact but divided into 
two or three pieces. Vesicula seminalis long, tubular and 
coiled. Ovary tri-lobed. Yolk-glands in two sets of 
small rounded follicles, close together, not extending' 
outwards beyond the intestinal limbs. 
Found in the body-cavity of the sting-ray, Dasybatis 
k uhlii. 
Type-specimen in the Museum of the Australian Institute 
of Tropical Medicine, Townsville, Xo. T. 39. 
Co-type in the Australian Museum, Sydney, No. AY. 369. 
Four specimens of this species, two of which were sectioned, 
were obtained from the body-cavity of the sting-ray. The pos- 
terior part of the body is almost circular, with a short blunt 
anterior part. It maybe compared to the petal of a flower in 
which the lamina is circular and the claw short and blunt. The 
length of the animal varies from 3'3 to 3*76 mm., the 
breadth from 3 to 3'5 mm. The integument is smooth, 
without spines of any kind. The mouth-opening is terminal, 
the oral sucker bowl-shaped and deep, but the ventral sucker 
^ TToXvg and KXadog (branch), referring to the branches of the intestinal 
limbs. 
