ox SOME QUEEXSLAND TIIEMATODES. 
389 
toadfislo a large number of specimens were obtained from the 
gullet of the spotted toadfish^ and they appear to me not to 
differ from this species except in their smaller size. They 
measured up to 4'25 mm. long by 1*78 mm. broad. 
While I place this species in Odlmer^s genus Steringo- 
trema^ it appears to be more closely related to Distomum 
vibex Linton {27, p. 291^ figs. 48-51) than to any of the 
three species enumerated by Odhuer ( 51 ). Distomum 
vibex Linton evidently belongs to the same genus. S. 
pulchrum differs from Linton’s species mainly in the dis- 
position of the yolk-glauds, in the shorter intestinal limbs_, in 
the more confined distribution of the uterine loops, and in the 
size and shape of the eggs. It differs from S. cluthensis 
Nicoll, S. pagelli van Ben. and S. diver gens Bud. 
in size, in the relative sizes of the suckers, in the very short 
oesophagus, in having the post-acetabular considerably longer 
than the pre-acetabular region, and in the very different 
disposition of the yolk-glands, as well as differing from each 
of the three species named in a number of other points. 
Fain. Gorgoderidm. 
Sub-fam. Anaporrhutinm Lss. 
Petalo distomum^ g'^n. nov. 
Diagnosis. — Posterior part of the body very broad, almost 
circular and plate-like. Muscular pharynx present; 
short oesophagus. Genital pore at or behind the intestinal 
fork. Cirrus sac very weak ; testes deeply lobed and divided 
into several distinct pieces, or broken up into a large number 
of rounded follicles, lying wholly outside the intestinal 
limbs. Large receptaculum seminis present but no LaurePs 
canal. Yolk-glands lying wholly within the intestinal 
limbs. 
Type P. polycladum. Parasitic in the sting-ray, Dasy- 
b atis kuhlii . 
TTtTaXov, a plate. 
