CONTENTS OF No. 215.-New Series. 
MEMOIRS : 
PAGE 
The Formation of the Layers in Aniphioxus, and its bearing on the 
Interpretation of the Early Ontogenetic Processes in other Verte- 
brates. By E. W. MacBride, D.Sc., LL.D., F.R.S., Strathcona 
Professor of Zoology in McGill University, Montreal. (With 
Plates 18—21, and 10 Text-figures) .... 279 
The Structui'e, Development, and Bionomics of the House-fly, Musca 
domestica, Linn. Part III. — The Bionomics, Allies, Parasites, 
and the Relations of M. domestica to Human Disease. By 
C. Gordon Hewitt, D.Sc., Late Lecturer in Economic Zoology, 
University, of Manchester. (With Plate 22) . 347 
The Development of the Temnocephalese. Part I. By Professor 
W. A. Haswell, M.A., D.Sc., F.R.S. (With Plates 23 — 25) . 415 
Experimental Observations on the Organs of Circulation and the 
Powers of Locomotion in Pennatulids. By Edith M. Mdsorave, 
D. Sc. (nee Pratt), Late Honorary Research Fellow in the Univer- 
sity of Manchester. (With Plates 26 and 27) . . 443 
