49 



PAPERS READ. 



A CONTRIBUTIOISr TO A FURTHER KNOWLEDGE OF 

 THE CYSTIC CESTODES. 



By Jas. p. Hill, F.L.S., Demonstrator of Biology, Sydney 

 University. 



(^Plates iii.-v.) 



The following paper may for convenience be divided into three 

 l)arts. 



Part i. includes the descriptions of two new species of the 

 genus Piestocystis, Diesing, — the first from the copper-head snake, 

 Uoplocejjhalus supej'bus ; the second, a somewhat remarkable 

 proliferating form from the lizard Lialis — and the general consi- 

 derations following therefrom. 



Part ii. is a description of a new species of Monocercus from 

 the earthworm Didymogaster sylvatica, Fl. 



Part iii. contains an account of the development of the scolex 

 of Synbothrium, a genus of Teirarhynchidce. 



I must here express my great indebtedness to Prof. Haswell 

 for his ever ready advice, and for much valuable assistance during 

 the course of my work ; and also my best thanks are due to Mr. 

 Masters, Curator of the Macleay Museum, and to Mr. H. Throsby 

 for the material in which the cysts described in Part i. were found; 

 also I have to thank Herr W. Musmann for much assistance with 

 the literature. 



PART I. 



1. On A NEW Species op Piestocystis from Hoplocephalus 



SUP Eft BUS. 



The cysts on which the following account is based were found 

 imbedded in the peritoneum surrounding the intestine of a single 

 specimen of the "copper-head" snake, Hojolocephalus superbus, 



