IV CONTENTS. 



PAGE 



A Revision of the Genus Steganoporella. By Sidney F. 

 Harmek, Sc.D., F.ii.S., Fellow of King's College, Cambridge; 

 Superintendent of the University Museum of Zoology. (Witli 

 Plates^l2 andls) . . . . . .225 



On a New Histriobdellid. By William A. Haswell, M.A., 

 D.Sc., F.E..S., Challis Professor of Biology, University of 

 Sydney. (With Platesl4 and Is) . . . .299 



On Spongioporphyrin : the Pigment of Suberites Wilsoni. By 

 C. A. MacMtjnn, M.A., M.D. (Witii Platele) . . 337 



Further Remarks on the Development of Aniphioxus. By £. W. 

 MacBride, M.A., D.Sc.(Lond.), Professor of Zoology in McGill 

 University, Montreal. (With Plate'^17) . . .351 



Quelques Observations sur les Onychopliores (Peripatus) de la 

 Collection du Musce Britannique. Par E. L. Bouvier. i^ro. 

 fesseur au Museum d'Histoire Naturelle dc Paris . . 367 



On tiie Diplochorda. III. The Early Development and Anatomy 

 of Phoronis Buskii, Mel. By Arthur T. Masterman, 

 MA. (Cantab.), D.Sc.(Lond. and St. A.), Lecturer on Zoology in 

 the New Medical School, Edinburgh. (Willi Plates^lS— ^21) . 375 



CONTENTS OF No. 171, N.S., JULY, 1900. 



MEMOIRS : 



The Anatomy and Classification of the Arenicoiidse, with some 



Observations on their Post-larval Stages. By F. W. Gamble, 



M.Sc, and J. H. Ashworth, D.Sc, Demonstrators and Assistant 



Lecturers in Zoology, Owens College, Manchester. (With Plates 



"22—29) ,...'.... 419 



Diagrams illustrating the Life-History of the Parasites of Malaria. 

 By Ronald Ross, D.P.H., M.R.C.S., Lecturer in Tropical 

 Medicine, University College, Liverpool, and R. Fielding-Ould, 

 M.A., M.B., Acting Demonstrator, Liverpool School of Tropical 

 Medicine. (With Plates '30 and' 31) . . . .571 



Note on the Morphological Significance of the Various Phases of 

 Hseniamoebidse. By E. Ray Lankester . . .581 



