326 ON SOME TRKMATODE PARASITKS OF AUSTRALIAN FROGS, 



and a thicker, wider and less mobile division behind it. Size 

 moderate, average length 5-7 mm., by 1-76 mm. broad. In- 

 tegument smooth, without spines or tubercles. Oral sucker 0-38 

 mm. ir. diameter, ventral 0-589 mm. ; ratio of oral to ventral, 

 2:3. Genital opening just behind the intestinal fork. Testes 

 irregular in shape and lobed, in two antero-posterior rows, 

 five on one side and four on the other. Vesicula seminalis 

 large; no cirrus-sac. Ovary lobed, large (0-375 mm. long), 

 always in line with the five testes. Laurer's canal present, but 

 no receptaculum seminis ; a very large receptaculum seminis 

 uterinum. Uterus of small calibre, but very long, with very 

 numerous coils that extend out to the lateral edges of the 

 body. Yolk-glands a pair of compact bodies of from three to 

 six close-lying lobes. Size of eeigs 0033 mm. x 0-019 mm. 



Hosts, Hyla aurea and Limnodynastes peronii, in bladdei-. 



Type-specimen in the Australian Museum, No. W.340. 



Elongated worms with the narrower, very mobile and ex- 

 tensible anterior portion in front of the ventral sucker, and a 

 less mobile, wider and thicker posterior part behind it, as in 

 Gorgodera generally. 



The average length is 5-7 mm., with a maximum of 9-95 

 mm., and a minimum of 3-96 mm., average breadth 176 mm. 

 Integument smooth, without spines or tubercles. The oral 

 sucker is subterminal and rounded, with an average diameter 

 of 0-38 mm. The ventral is a large, globular sucker, deeply 

 implanted in the body (Fig. 65), with an average diameter of 

 0-589 mm. Ratio of oral to ventral sucker, 2:3. The sucker 

 does not, as a rule, extend laterally beyond the intestinal 

 limbs ; the opening of the oral sucker is on the ventral sur- 

 face ; the excretory pore is terminal and posterior, and the 

 genital opening in the middle line, halfway between the ven- 

 tral and the oral suckers, just behind the fork of the intes- 

 tine. As in 6-'. cygnoides, there is a small group of glands 

 (the "head glands") on each side just behind the oral sucker. 



In the alimentary canal, there is no muscular pharynx ; the 

 oesophagus is moderately long (Fig. 63), with walls of fairly 



