320 ON SOME TREMATuDE PARASITKS OF AUSTRALIAN FROGS, 



disposition of the yolk-glands, the respective disposition in 

 each species being Very constant and characteristic. In B. 

 symnietrus, the two lateral lines ot yolk-follicles that occur in 

 OpistJiioglyphe, Dolirhos(/criis, and JJ. anartius have become 

 broken up into anterior masses and posterior masses. The 

 anterior masses extend from the level of the pharynx back- 

 wards to the level of the ventral sucker, and do not extend 

 inwards beyond the intestinal limbs; the posterior masses 

 begin in a lateral position, a little in front of the testes, and 

 gradually spread inwards (Fig. 10), till they spread under the 

 whole posterior surface. f 



Brachysnccus seems to find its nearest relations in OpisfJiio- 

 (/li/p/ie and iJo/irJiosf/rrit.'<, differing from them mainly in the 

 much more extended disposition of the uterus-loops, and the 

 oblique position of the testes. The great length of Laurer's 

 canal seems to represent the extreme development of elonga- 

 tion, shown in a more moderate degree in Dolichosaccvs. The 

 character of the integument, the configuration of the alimen- 

 tary canal and of the excretory vessels, and, with the excep- 

 tion of the uterus, the disposition and character of the genital 

 organs, inchiding the yolk-glands, is in pretty close agree- 

 ment in all three genera, so that they all evidently belong to 

 the same sub-family. 



Literature referred to -8, 9, 31, 48, nO, 51, 57, 75, 97. 



Genus Pneumonoeces Looss. 



Pneumonceces australis,* sp.n. 



(Figures 11, 56-62). 



JJiin/ti<i.'<i.'<. — Elongated oval worms, narrower in front, 3-5 

 mm. long by 1-52 mm. broad. Skin smooth, without spines. 

 Oral sucker 0-398 mm., vetitial 0193 mm. in diameter; rafin 

 of oral /() rriifrdJ 2:1. Pliarynx equal in size to ventral suc- 

 ker ; a-sophagvis short : intestinal limbs reaching almost to 



* 1 



auslraliH, southern. 



