316 ox SOME TREMATOf)E PARASITES OF AUSTRALIAN FKuGS, 



other points. The character of the integument and suckers 

 is very similar in the two genera, but the form of the body is 

 different, being narrower and more pointed in Dolichosaccus. 

 The testes are of different shape, and, relative to the ventral 

 sucker, the ovary is placed further back in the Australian 

 genus, while the cirriis sac is much larger, and Laurers 

 canal a much more conspicuous structure. The yolk-glands, 

 too, are more extensively developed in the posterior region of 

 the body. 



Literature referred to— 8, 9, 31, 48, 50, 51, 57, 75, 97. 



Genus B r a c h y s a c c u s,* gen. nov. 



Subfamily Plagiorchinoe Liihe, (Lepodermatinae Looss). 

 (Figures 9, 10, 51-5.5.) 



Didcinosis. — Small, lancet-shaped /conns, with a tiattened 

 elliptical cross-section. Integument spiny, the spines disap- 

 pearing towards the posterior end. Ventral sucker at the be- 

 ginning of the middle third of the body. Pre-pharynx, 

 pharynx and oesophagus present ; intestinal limbs reaching the 

 posterior end of the body. Excretory vesicle Y-shaped, with 

 the Kfcni runninf/ between the testes. Testes obliquely one 

 behind the other in the posterior end of the body. Ovary 

 between the testes and the ventral sucker. Copulatory organs 

 present ; genital pore on the ventral surface near the oesopha- 

 gus, rirrus-sac wholly in front of the ventral sucker, and much 

 shorter than in Dolirhosanus ; a very lony JjOitrer's ranal and 

 receptaculum present. Yolk-glands lateral, mainly outside 

 the intestinal limbs, eatendiny from the intestinal fork to 

 ?iear the posterior end of the body. Coils of the uterus be- 

 tween the testes and the rirrvx-sar. 



In the intestine and rectum of frogs. 

 Type species, Brachysom/s annrtius, sp.n. 



^Spayi'S, short. 



