CONTENTS OF No. 196.—New Series. 
MEMOIRS: 
Studies in Spicule Formation. Part IV. By W. Wooptanp, Uni- 
versity College, London. (With Plates 32—34) 
On the Maturation ofthe Unfertilised Egg, and the Fate of the Polar 
Bodies in the Tenthredinide (Sawflies). By L. Doncaster, M. A., 
Mackinnon Student of the Royal Society. (With Plates 35 and 36) 
The Réle of Mucus in Corals. By J. E. Duerpen, Ph.D., A.R.C.Se. 
(Lond.), Professor of Zoology at the Rhodes University College, 
Grahamstown, Cape Colony : : 
Observations on the Structure and Life-history of Pleistophora 
periplanete, Lutz and Splendore. By W. S. Prrrin, B.A., 
Shuttleworth Research Student of Gonville and Caius College, 
Cambridge. (With Plates 37 and 38) es 
A Study of the Life-history of Bucephalus haimeanus: a Para- 
site of the Oyster. By Davin Hist Tennent. (With Plates 
39—42) : : 
Wits Titte, Contents, anD INDEX TO VOL. 49. 
PAGE 
533 
561 
591 
615 
635 
