CONTENTS OF No. 162-New Series. 



MEMOIRS : 



PAGE 



The Segmentation of the Ovum of the Sheep, with Observations on 

 the Hypothesis of a Hypoblastic Origin for the Trophoblast. By 

 Richard Assheton, M.A. (With Plates 15—18) . . 205 



On the Heart-body and Ccelomic Fluid of Certain Polychasta. By 

 Lionel James Picton, B.A. (With Plates 19—22) . . 263 



On the Hypothesis that Lake Tanganyika represents an Old Jurassic 

 Sea. By J. E. S. Moore. (With Plate 23) 303 



On the Reno-pericardial Canals in Patella. By Edwin S. Goodrich, 

 B.A., Aldrichian Demonstrator of Comparative Anatomy, Oxford. 

 (With Plate 24) 323 



