CONTENTS OF No. 223.-New Series. 



MEMOIRS : 



PAGE 



Contributions to the Cytology of the Bacteria. By C. Cliffoed 

 DoBELL, Fellow of Trinity College, Cambridge ; Lecturer at the 

 Imperial College of Science and Technology, London. (With 

 Plates 16-19 and 1 Text-figure) . . .395 



On Cristispira Veneris nov. spec, and the Affinities and Classi- 

 fication of Spirochsets. By C. Cliffokd Dobell, Fellow of Trinity 

 College, Cambridge ; Lectiirer at the Imperial College of Science 

 and Technology, London. (With Plate 20 and 2 Text-figures) . 507 



On the Development and Structure of the Trochophore of H y d r o i d e s 

 uncinatus (Eupomatus). By Cresswell Shearer, M.A., 

 Trinity College, Cambridge. (With Plates 21-23 and 29 Text- 

 figures) ....... 543 



Studies in the Experimental Analysis of Sex. By Geoffrey Smith, 

 M.A., Fellow of New College, Oxford .... 591 



