A NEW AVIAN LIVER-FLUKE. 89 



confined entirely behind the ventral sucker, and the terminal 

 part of the uterus passes forwards as a single narrow tube, 

 slightly twisted but unconvoluted. The vagina appears to be only 

 weakly developed. The numerous eggs measure •033- , 039 x '018- 

 •020 mm. 



Amongst the many species of Platynosomum this new form 

 bears the closest resemblance to P. deflectens (Rud., Braun, 1902) 

 and P. petiolatum (Railh, Braun, 1902). From both it differs 

 only in minor details. P. deflectens is a considerably smaller 

 species with relatively larger suckers. An oesophagus is almost 

 absent, while the cirrus-pouch is short and plump. The testes 

 are globular and more closely apposed. P. petiolatum is a larger 

 species with a shorter neck. The oesophagus is extremely short, 

 and the cirrus-pouch extends past the anterior border of the 

 ventral sucker. The yolk-glands, again, are somewhat more 

 extensive but sparser, while the uterus is not so voluminous. 

 Apart from these anatomical details, the difference in host indi- 

 cates that the present species is distinct from either of the 

 above mentioned forms. 



I have to thank Mr. Dunkerley for his courtesy in submitting 

 the specimen for examination. 



Reference. 



Braun, M. " Die Fascioliden der Vogel," Zool. Jakrb., Syst. 

 Abt. xvi., 1902. 



