CONTENTS OF No. 164-New Series. 



MEMOIRS : 



On Differences iu the Histological Structure of Teeth occurring within 

 a Single Family — the Gadidse. By Charles S. Tomks, M.A 

 F.R.S. (With Plate 36) 



A Description of Two New Species of Spongilla from Lake Tanganyika 

 By Richard Evans, B.A. (With Plates 37 and 38) 



PAGE 



459 

 471 



On Tetracotyle petromyzontis, a Parasite of the Brain of Am- 

 mocoetes. By Albert W. Brown, B.A., F.L.S., Formerly Ex- 

 hibitioner of Christ Church, Oxford. (With Plate 39) . . 489 



Studies on the Structure and Formation of the Calcareous Skeleton of 

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

 Tutor of New College, Oxford ; University Lecturer in Compa- 

 rative 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.Lcnd., 

 Hon. M.A.Cantab., Balfour Student of the University of Cambridge 589 



Index 611 



Table of Contents. 



