CONTENTS OF No. 194.—New Series. 
MEMOIRS: 
PAGE 
Studies in Spicule Formation. By W. Wooptanp, University College, 
London. (Part I, Plates 13—15 ; Part II, Plates’16,17; Part III, 
Plates‘18,19) . ’ : aoe 
The Digestive Organs of the Alcyonaria and their Relation to the 
Mesogleeal Cell Plexus. By Epitn M. Pratt, D.Se.Vict. (With 
Plates’20—22) . : : : : eae 
A Contribution to the Morphology and Development of the Pectoral 
Skeleton of Teleosteans, By H. H. Swinnerton, D.Sc., F.Z.S., 
University College, Nottingham. (With Plate ”23 and three - 
Figures in the Text) ‘ : ‘ ; . 363 
Observations on Hematozoa in Ceylon, By Atpo CastetianI, M.D., 
Director of the Bacteriological Institute, Colombo, and ARTHUR 
Witty, F.R.S., Director of the Colombo Museum. (With Plate 624) 383 
The Gastrulation of the Vertebrates. By A. A. W. Husrecut. . 403 
The Gastrulation Question. By Franz KErBex : ; 2) Pee 
