CONTENTS OP No. 266— New Series. 



Volume 67. Part II. 



MEMOIRS : page 



The Male Meiotic Phase in two Genera of Marsupials (Macropus and 

 Petauroides). By W. E. Agar, F.R.S., Professor of Zoology in the 

 University of Melbourne. (With Plates 12-14) . . . .183 



Marsupial Spermatogenesis. By A. W. Greenwood, B.Sc, University 

 of Melbourne. (With Plates 15 and 16) 203 



On Sexual DiiFerentiation in the Infusoria. By Prof. V. A. DoGiEL, 

 Zootomical Laboratory, University of Petrograd. (With Plate 17 

 and 1 Text-figure) 219 



Sanguinicola from the Sudan. By W. N. F. Woodland, Wellcome 

 Bureau of Scientific Research. (With Plate 18) ... . 233 



OnCentropygus joseensis, a Leech from Brazil. By Charles 

 Badham, B.Sc, M.B., Ch.M. (With 10 Text-figures) . . .243 



Some Observations on the Hypophysis of Petromyzon and of Amia. 

 By G. R. de Beer, B.A., Bc.C. (With 34 Text-figures) . . .257 



The Relation of the form of a Sponge to its Currents. By G. P. 

 Bidder, Sc.D. (With 12 Text-figures) 293 



Mr. Milford, Oxford University Press, Amen Corner, London, E.C. 4, will he glad to 

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