CONTENTS OF No. 138. -New Series. 



MEMOIRS: 



Studies on the Comparative Anatomy of Sponges. By Arthur 

 Dendy, D.Sc, Fellow of Queen's College, and Demonstrator and 

 Assistant Lecturer in Biology in the University of Melbourne. 

 (With Plates 10— 14) 159 



Some Points in the Origin of the Reproductive Elements in Apus and 

 Branchipus. By J. E. S. Moore, A.R.C.S., from the Huxley 

 Research Laboratory, Royal College of Science, London. (With 

 Plates 15 and 16) 259 



Notes on the Peripatus of Dominica. By E. C. Pollard, B.Sc.Lond. 

 (With Plate 17) 285 



Studies on the Protochordata. By Arthur Willey, B.Sc.Lond., 

 Columbia College, New York. (With Plates 18—20) . . 295 



