CONTENTS OF No. CXIII.— New Series. 



OIEMOIRS: 



PAGE 



Haplodiscus piger; a new Pelagic Organism from the Bahamas. 

 By W. F. R. Weldon, M.A., Fellow of St. John's College, Cam- 

 bridge, Lecturer on Invertebrate Morphology in the University. 

 (With Plate I) 1 



The True Teeth and the Horny Plates of Ornithorhynchus. By 

 Edwa-RD B. Poulton, M.A., F.L.S., of Jesus and Keble Colleges, 

 Oxford. (With Plates II, III, and IV) .... 9 



Note on the Fate of the Blastopore in Rana teniporaria. By 

 Harold Sidebotham, M.B.C.S. (With Plate V) . . 49 



Morphological Studies. — I. The Parietal Eye of the Cyclostome 

 Fishes. By J. Beard, Ph.D., B.Sc. (With Plates VI and VII) . 55 



On Some Oigopsid Cuttle Fishes. By F. Eknest Weiss, F.L.S., 

 rom the Zoological Laboratory, University College, London. (With 

 Plates VIII, IX, and X) 75 



The Organ of VerriU in Loligo. By MiLCOLM Laueie, B.Sc, from 

 the Zoological Laboratory of University College, London. (With 

 Plate XI) 97 



