« 



CONTENTS OF No. 217.-New Series. 



MEMOIRS : 



On the Anatomy and Systematic Position of Incisura (Scissu- 

 rella) Lytteltonensis. By Gilbert C. Bourne, Fellow of 

 Merton College, Oxford, and Linacre Professor of Comparative 

 Anatomy. (With Plates 1-5) .... 



The Eye of Pecten. By W. J. Dakin, M.Sc, Demonstrator and 

 Assistant Lecturer in Zoology, University of Belfast. (With 

 Plates 6 and 7, and 2 Text-figures) .... 



Observations on Certain Blood-Parasites of Fishes occurring at 

 Eovigno. By Prof. E. A. Minchin, M.A., and H. M. Wooucock, 

 D.Sc. (With Plates 8-10) • • . . . 



OnGanymedes anaspidis (nov. gen., nov. sp.) : a Gregarine from 

 the digestive tract of Anaspides tasm anise (Thompson). 

 By Julian S. Huxley. (With Plate 11, and 5 text-figures) 



The Fojtal Membranes of the Vertebrates. By A. A. W. Hubeecht . 



PAGE 



49 



113 



155 

 177 



