BY S. J. JOHNSTON. 321 



posterior end of body. Genital opening on the ventral sur- 

 face, near the middle line, just behind the oral sucker. Testes 

 very large, oval, trith a feir deep grooves, the posterior testis 

 longer and narrower than the atiterior ; situated in the pos- 

 terior part of the body, on either side of the middle line, one 

 a little behind the other. Cirrus-sac very long and tubular, 

 with a slightly coiled vesicula seniiiiaUs ; a strong cirrus and 

 ejaculatory duct. Ovary deeply lohed, large and elongated, 

 laterally placed in front of posterior testis, on a level with the 

 ventral sucker. Receptaculuni seminis very large, o)i a level 

 nith, and ventral to the ovary. Postero-lateral uterine loops 

 present, not reaching forward an far as the ovary. Yolk- 

 ghnids iii four main groups, a pair of anterior groups, each 

 of 4 or 5 bunches of 15 follicles, and a pair of posterior 

 groups, each of 5 or 6 bunches of 12-15 follicles. Eggs very 

 small, 0-020xO-Ul4mni. 



Hosts : Hyla aurea and Limnodynaf<tes jjeronii. 



Type-specimen in the Australian Museum, No. W.339. 



The shape of these worms varies from an elongated oval, 

 narrower in front, to tongue-shaped. Figures 56-57 and 62 

 are photographs of typical specimens. Leaving out the very 

 small ones, which may be looked upon as more or less imma- 

 ture, the size averages 3-5 mm. long, by 1-52 mm. broad, with a 

 maximum length of 4-9inm., and a minimum of 2-5 mm. The 

 integument is quite smooth, showing no trace of spines or 

 tubercles. The oral sucker, subterminal in position, is large, 

 while the ventral is small. The relation in size between the 

 suckers is a very constant one, being exactly the same, viz., 

 2:1, in most of those measured. The average sizes are, oral 

 0-398 mm., ventral 0193 mm. The ventral sucker is placed 

 just anterior to the middle of the body-length. The relative 

 size of the pharynx is also very constant : it is globular in 

 form, with a diameter of 0191 mm., i.e., slightly smaller 

 than the ventral sucker. There is a short but distinct oesopha- 

 gus, and the wide intestinal limbs run practically to the 

 posterior end of the body. 



