IV 
CONTENTS. 
CONTENTS OF No. 215, N.S., DECEMBER, 1909. 
MEMOIRS : PAGE 
The Formation of the Layers in Amphioxus, and its bearing 
on the Intei'pretation of the Early Ontogenetic Processes in 
other Vertebrates. By E. W. MacBride, D.Sc., LL.D., F.K.S., 
Strathcona Professor of Zoology in McGill University, Montreal. 
(With Plates 18 — 21, and 10 Text-figures) . . . 279 
The Structure, Development, and Bionomics of the House-fiy, 
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 Develojnuent 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. 
Musgrave, D.Sc. (nee Pratt), Late Honorary Research Fellow 
in the University of Manchester. (With Plates 26 and 27) . 443 
CONTENTS OF No. 216, N.S., FEBRUARY, 1910. 
MEMOIRS : 
On Certain Features in the Development of the Alimentary Canal 
in Lepidosiren and Protopterus. By J. Graham Kerr, 
Professor in the University of Glasgow. (With 13 Text-figures) 483 
The Phylogeny of the Tracheie in Araneie. By W. F. Purcell, 
Ph.D., Bergvliet, Diep River, near Cape Town. (With Plate 
28, and 21 Text-figures) ..... 519 
On the Reproduction of Kalpidorhynchus arenicola; 
(Cnghm.). By Margaret Robinson, University College, 
London. (With Plate 29) .... 565 
Studies in the Experimental Analysis of Sex. By Geoffrey 
Smith. (With Plate 30) ..... 577 
Some Points in the Physiology of Lamellibranch Blood-Corpuscles. 
By G. H. Drew, B. A. Cantab. (With Plate 31) . . 605 
Note on the Cytology of Calothrix fusca. By Dr. N. H. 
SwELLENGREBEL, Amsterdam. (With Plate 32) . . 621 
Tropidonotus and the “ Archenteric Knot ” of Ornithorhynchus. 
By Richard Assheton, M.A. (With Plate 33) . . 633 
Title, Index, and Contents. 
