108 



CONTRIBUTIONS TO A KNOWLEDGE OF AUS- 

 TRALIAN ENTOZOA. 



No. iii. — On some species of Holostomid.e from Australian 



Birds. 



By S. J. Johnston, B.A., B.Sc, Economic Zoologist, 

 Technological Museum, Sydney. 



(Plates v.-vii.)' 



In the present paper, five species of Holostoynidce, all para- 

 sites of Australian birds, are described as new. Two of them 

 are referred to the genus Hemistomum, and three to the genus 

 Holostomum. They were all collected by Dr. J. P. Hill, Demon- 

 strator of Biology at the University of Sydney, and formed part 

 of a collection of Trematodes and Cestodes given by him to me 

 for investigation. In addition to the collection of worms, I am 

 indebted to Dr. Hill for some valuable preparations of some of 

 the specimens and notes as to their location in their hosts, kc. 



Dr. Brandes' ' Monograph on the Holostomidse,' published in 

 the Zoologischer Jahrbiicher, Band v., has been of especial use to 

 me in the preparation of this paper. The lengths given are 

 measured along ventral body wall. 



Hemistomum triangulare, sp.n. 

 (Plate v., figs. 1-6.) 



Length 2-3 mm. ; tlie anterior region shorter than the posterior, 

 about one-third of the total length. The flattened anterior body- 

 region is triangular in shape, the mouth opening situated at the 

 apex of the triangle; the lateral edges strongly curved round 

 (PI. V, fig. 5). 



The clinging plug is situated near the junction with the pos- 

 terior body-region, and its base of attachment is short, not 



