TREMATODES OF AUSTRALIAN BIRDS. 251 



Holostomim:. 



Strigea promiscua, Nicoll, found in the intestine of two 

 owls in Queensland, Ninox maculata and N. boobook is 

 nearly related to S. gracilis, which occurs in certain 

 anseriformes in Europe. Strigea ftosculus, Nicoll is a worm 

 of doubtful affinities. 



Hemistomum brachyurum, Nicoll, found in the intestine 

 of Ninox maculata in Queensland, and Hem. triangulare 

 mihi, parasitic in Dacelo gigas and Ninox maculata in New 

 South Wales may be looked upon as the Australian repre- 

 sentatives of the European Hem. spathula parasitic, in 

 various members of the Strigiformes. 



Hemistomum intermedium, mihi, found in the duodenum 

 of the Black Swan, Chenopsis atrata, seems to be a con- 

 necting link between Hemistomum and Holostomum. It 

 does not appear to have any near relatives and it must be 

 looked upon as an aberrant or perhaps rather a primitive 

 form. 



Holostomum liillii, mihi, found in the duodenum of Larus 

 novce-hollandice is nearly related to H. erraticum which is 

 found parasitic in several species of Larus in Europe. 

 Holostomum simplex, mihi, from the intestine of Ardea 

 novce-hollandice is more nearly related to H. cornu than 

 to any other form. H. cornu is parasitic in various old- 

 world species of herons belonging to the genus Ardea. 



Holostomum musculosum found in the duodenum of the 

 Crested Tern, Sterna bergii, is most nearly related perhaps 

 to H. bursigerum found parasitic in several European 

 Lariiformes. 



