Myxobolus sp. 



This sporozoon is met with at times in Hyla aurea in the 

 Sydney district. It occurs in enormous numbers in the 

 genital organs, the whole organ becoming converted into a 

 swollen tube filled with a whitish fluid containing myriads 

 of these parasites. Attention lias already been called to 

 the presence of these Myxospovidia in this host. 2 They 

 have not been found in any of the other species examined. 



Opalina sp. 

 This degenerate ciliate infusorian is comparatively com- 

 mon in the intestine of Hyla aurea, H. caerulea, Limno- 



dynastes pevouii, and L. dorsalis, in Sydney district. It 

 has not been looked for in other frogs. 



Nyctotherus sp. 

 This actively swimming ciliate infusorian is very common 

 in the above mentioned four species locally. There is also 

 a very large form present in Hyla aurea measuring 0'47mm. 

 by 0-324 mm. Whether this is a distinct species from the 

 smaller and oommuimr form we cannot yet say. 



Fig. 1. Normal corpuscle of Harris ville Frog, for comparisc 



Trypanosoma. 

 Figs. 2-10. Trypanosoma rotatorium ? showing pleomorphism. 

 Figs. 11-22. Erythrocytes of Hyla caerulea parasitised by Haei 



' A. W. Fletcher, Proc. 

 Harwell, Proc. Linn. Soc. 



" >i, Vol. XLIII, 1 



