CONTENTS. 



PAGE 



On Tetracotyle petromyzontis, a Parasite of the Brain of 

 AmmoecEtes. By Albert W. Brown, B.A., F.L.S., formerly 

 Exhibitioner of Christ Church, Oxford. (With Plate 39) . 4S9 



Studies on the Structure and Formation of the Calcareous Skeleton 

 of the Anthozoa. By Gilbert C. Bourne, M.A., F.L.S., 

 Pellow and Tutor of New College, Oxford ; University Lecturer 

 in Comparative Anatomy. (With Plates 40 — 43) . . 499 



The Structure and Development of the Hairs of Monotremes and 

 Marsupials. — Part I. Monotremes. By Baldwin Spencer, 

 M.A., Professor of Biology in the University of Melbourne, and 

 Georgina Sweet, M.Sc, University of Melbourne. (With 

 Plates 44 — 46) ....... 549 



Trophoblast and Serosa; a contribution to the Morphology of 

 the Embryonic Membranes of Insects. By Arthur Willey, 

 D.Sc.Lond., Hon. M.A. Cantab., Balfour Student of the Uni- 

 versity of Cambridge ...... 589 



Title, Index, and Contents. 



