BY S. J. JOHNSTON. 297 



Order HETEROCOTYLEA. 



Family P o l y s t o m i d ^, 



Subfamily Polystominae. 



POLYSTOMUM BULLIENSE, Sp.n. 



(Figures 1, 2, 18-28.) 



Diagnosis. — Flattened oval worms, 3 mm. long by 1 mm. broad; 

 with a somewhat circular cotylophure marked off into six rounded 

 lobes, each bearing a circular sucker. Larval booklets on the 

 disc and suckers; and two large falciform hooks bearing a bilobed 

 crest, present. Well-marked vaginal stvellings. Oesophagus 

 wanting; intestinal limbs reaching into the caudal disc, without 

 transverse anastoinosing branches. Testis a flat plate of follicles 

 in the middle of the ventral surface of the body; a single vas 

 deferens; a crownlet of eight penis-spines. Ovary a large oval 

 body obliquely placed. Genito-intestinal canal present. Yolk- 

 glands extending over the whole dorsal surface from near the 

 genital opening, right back into the caudal disc. Uterus a straight 

 wide tube, running from the posterior end to the genital opening. 

 Eggs thick-shelled, bright yellow, large, 0-206 mm x 0-095 mm. 



In the bladder of Hyla phyllochroa and //. lesueurii. 



Type-specimen in the Australian Museum, No. W. 346. 



Sixteen specimens of these worms, which may be looked upon 

 as the Australian representatives of P. integerrimum, were 

 obtained, one from Hyla lesueurii and the rest from H. phyllo- 

 chroa. These frogs were obtained from a tributary of the Lodden 

 River, near Bulli, N.S. W., in October and November. The 

 worms occurred in the urinary bladder, and sometimes only a 

 single specimen was found; usually there were two, and once as 

 many as four were found in one bladder. 



The worm is a narrow oval in shape, with a wider, six-lobed 

 cotylophore at the posterior end, bearing six circular suckers, 

 near the margin, one on each rounded lobe. The body is fairly 

 flat, transverse sections being a flattened oval in shape, less 

 flattened towards the anterior and more flattened towards the 



