iv CONTENTS. 



CONTEXTS OF No. 223, N.S., APRIL, 1911. 



MEMOIRS: PAGE 



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

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

 Imperial College of Science and Technology, London. (With 

 Plates 10-19 and 1 Text-figure) .... 395 



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

 fication of Spirochtcts. By C. Clifford Dobell, Fellow of 

 Trinity College, Cambridge ; Lecturer 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 

 Hydroides uncinatus (Eupomatus). By Cresswell 

 She.\rer, 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 



CONTENTS OF No. 224, N.S., JUNE, 1911. 



MEMOIRS : 



Cortical Cell Lamination of the Hemispheres of Papio Hama- 

 dryas. By E. H. J. Schuster, M.A., D.Sc, Fellow of New 

 College, Oxford. (With Plates 24-30) . . . 613 



On Some Stages in the Life-History of Leptomonas muscaj 

 domes tic a", with some remarks on the Relationships of the 

 Flagellate Parasites of Insects. By J. S. Dunkerly. (With 

 Plate 31) I . .645 



On Merlia normani, a Sponge with a Siliceous and Calcareous 

 Skeleton. By R. Kirkpatrick. (With Plates 32-38 and 5 

 Text-figures) . . . .657 



Title, Index, and Contents. 



