CONTENTS OF No. CXXIX-New Series. 



MEMOIRS: 



PAGE 



Some Problems of Reproduction : a Comparative Study of Gametogeny 

 and Protoplasmic Senescence and Rejuvenescence. By Makcus 

 M. Hartog, M.A., D.Sc, F.L.S., Professor of Natural History in 

 the Queen's College, Cork ...... 1 



On Wandering Cells in Echinoderms, &c., more especially with regard 

 to Excretory Functions. By Herbekt E. Durham, M.A., King's 

 College, Cambridge, and Guy's Hospital, London. (With Plate I) 81 



On the Nature of the Excretory Processes in Marine Polyzoa. By 

 Sidney F. Harmer, M.A., B.Sc, Fellow and Assistant Tutor of 

 King's College, Cambridge. (With Plates II and III) . . 123 



Spermatogenesis in Myxine glutinosa. By J. T. Cunningham, 

 M.A., Naturalist on the Staff of the Laboratory of the Marine Bio- 

 logical Association, Plymouth. (With Plate IV) . . . 169 



Notes on some Aquatic Oligochseta. By W. Blaxland Ben ham, 

 D.Sc.Lond., Aldrichian Demonstrator of Comparative Anatomy, 

 Oxford. (With Plates V, VI, and VII) . . . .187 



On the Differentiation of Leprosy and Tubercle Bacilli. By Charles 

 Slater, M.B.Cantab. . ... .' . 219 



On a Specimen of the True Teeth of Ornithorhynchus. By Professor 

 Charles Stewart, P.L.S. (With Plate VIII) . . .229 



