5(10 



A NEW AVIAN TREMATODE. 



By Eleanor E. Chase, B.Sc, Demoxstbatoe ix Zoologv, UNi\-ERSiTy 



OF Sydney. 



(Commnnicated by Professor S. J. Johnston, B.A., D. Sc.) 

 (Pliile xxvi.; and cue Text-figure.) 



I.VTItODl'CTlO.V. 



The presence of Holastopiiim as an endoparasite of herons has been i-ecorded 

 by two authoi's. Brandes (1891, p. 594) records' H. corini Xitzsch and U. cinc- 

 tum Brandes from various species of Ardea. Johnston (1904, p. 112) described, 

 under the name of Holostomum simjAex, a trematode frojn the intestine of the 

 white-fronted heron yotoplioyx novae-lioUandiae, collected dt Creel Bay. Broken 

 Bay, N.S.W. 



I record here the occurrence of another species of Holostomum in this heron, 

 my description being based on three pieseived specimens, one of which had been 

 mounted whole, and two sectioned by Prof. S. J. Johnston, who had collected 

 them at Terrigal, N.S.W. The limited and imperfect nature of the material, 

 and, in particular, the lack of living sjieciniens has prevented more than a sum- 

 mary description being given. 



Description of tiik New Species. 



Family I10L()ST0:\rATinAE. 



SubfamUv HOLOSTOMEAE. 



Genus H o i, o s t o ji r m Nitzsch. 



Hoi.osTOllUJi repkxs, n.sp. (PI. xxvi.. fiijs. 1-5.) 



External Characters. — 11. re pens is mm. in lenjith and shows tiie umuiI 

 divnsion into two regions, not well marked otf from one another, the anterior 2 mm. 

 and the posterior 4 mm. long. The latter is narrower than the anterior regiun, 

 the diameter increasing towards the posterior end, and being gi-eatest in tlie 

 region of the testes, where it exceeds the width of the fore part of the body. In 

 preserved specimens the dorsal surface has a concave curvature, owing to the 

 contracted condition of the dorsal loniiitudinal nuiscle band>. 



