BY T. HARVEY JOHNSTON. 517 



this continent. Fielder has shown that the eggs of the fluke may- 

 pass through the typical larval stages within some of our fresh- 

 water gastropods, especially species of Bulinus (Lim^iaea). The 

 cercarise produced might, after encystment on grass, etc., be 

 transferred passively with the food into herbivorous marsupials, 

 and reach maturity, in the same way. as in sheep and cattle, in 

 both of which fluke is not uncommon in Eastern Australia, 

 especially in New South Wales, and Victoria. 



Tcenia echinococcus v. Lieb., the adult of the hydatid, occurs 

 in dogs in New South Wales, Tasmania, South Australia, West 

 Australia, and most probabl}^ in the other States, and has been 

 recorded by von Lendenfeld, Cleland (West Australia), Braun 

 (Australia), and Stirling (S. Australia) from Canis dingo. We 

 do not know whether the dingo harboured this parasite before 

 the arrival of the dog, and it is therefore not yet possible to state 

 definitely whether the hydatid has established itself comparatively 

 recently in the Marsupialia. The examination of hosts from 

 parts of the continent where the dog is unknown, would assist in 

 deciding both questions. It may not be out of place to mention 

 that the hj'datid is, in all probability, the commonest endoparasite 

 in Australia, being frequently met with in New South Wales in 

 human beings, sheep, cattle and pigs, and rarely in horses. The 

 same remark applies equally to other parts of the Commonwealth. 



4.MACR0PUS DORSALis Gray. 



Echinococcus polymorphus Dies. (2, 11, 22) seems to be the only 

 recorded parasite. Dr. Bancroft{2) of Queensland, recorded its 

 presence in the lungs, Cobb(ll) merely mentioning this reference. 



5.MACR0PUS DERBYANUS Gray. 



Moniezia f estiva Rud., has been identified by Cobbold(12) from 

 this host (Dr. Bancroft's collection, Queensland T). 



G.Macropus antilopinus Gould. 

 FilaHa roemeri v. Linstow(29)(Australia). 



