BY 8. J. JOHNSTON. 317 



B R A C H Y S A C C U S A N A K T I U S, * sp.n. 



(Figures 9, 51-55). 



Dkiijiiosis. — Small, laitcef-s/ifcjjt'd worms, with a flattened 

 oval cross-section, about 3-3 mm. long, and 1-2 mm. broad. 

 Integument spiny, the spines disappearing towards the pos- 

 terior end. Suckers almost equal in size, but the oral (U-205 

 mm.) rather smaller than the ventral (0-212 mm. in diameter;. 

 Pharynx comparatively large (01 48 mm. in diameter) : pre- 

 pharynx well-developed : oesophagus about equal in length to 

 the pharynx; intestinal limbs reaching the titreine posterior 

 end of the body. Excretory vesicle Y-shaped, winding be- 

 tween the testes. Genital pore on ventral surface beneath the 

 oesophagus. Testes rounded O-IT-") mm. in diameter, lying 

 one obitquejy behind the other in the middle of the posterior 

 body-third. Ovary oval or rounded, smaller than the testes, 

 0-142 mm. in diameter, lying to one side of the middle line, 

 about midway between the testes and ventral sucker. Laurer's 

 canal very long. Yolk-glands of numerous small follicles later- 

 ally placed, not extending forwards beyond the intestinal 

 fork, nor inwards beyond the intestinal limbs while in front 

 of the testes ; but those on the left side cross over behind the 

 testes, and fill wp some of tlie space between the testes and 

 the posterior end of the body. Loops of the uterus richly 

 developed, never reachinfj behind the testes, but tilling up 

 most of the space between the testes and the cirrus-sac Eggs 

 very numerous, 0-034 x 0-019 mm. 



In the intestine and rectum of II>/la a urea, and Limnody- 

 nastes peronii. 



Type-specimen in the Australian Museum, No. W.337. 



I have obtained over two hundred specimens of this worm 

 from the hosts named. Whilst it is very common in Hyln 

 a urea, being found more often than any other trematode in 

 that frog, it is much less common in h. peronii, in which I 



* ava/3Tto«, uneven, odd, referring to the yolk -glands. 



