IV CONTENTS. 



PAGE 



Ou the Morphology of the Cheilostomata. By Sidney F. Haemer, 

 Sc.D., F.R.S. (With Plates 15—18) . . . .263 



On the Development of Sagitta ; with Notes on the Anatomy of 

 the Adulr. By L. Doncaster. (With Plates 19—21) . 351 



CONTENTS or No. 183, N.S., DECEMBER, 1902. 



MEMOIRS : 



On a Cestode from Cestracion. By William A. Haswell, M.A., 

 D.Sc, F.R.S. (With Plates 22— 2tt) . . . .399 



The Development of Lepidosiren paradoxa. — Part III. De- 

 velopment of the Skin and its Derivatives. By J. Graham 

 Kerr. (With Plates 25—28) 417 



The Metamorphosis of Corystes Cassivelaunus (Pennant). 

 By Robert Gurney, B.A.(Oxon.), P.Z.S. fWith Plates 

 29—31) 401 



Artificial Parthenogenesis and Fertilisation: a Review. By 

 Thomas H. Bryce . . . . . .479 



CONTENTS OF No. 184, N.S., FEBRUARY, 1903. 



MEMOIRS : 



The Movements and Reactions of Fresh-water Plauarians; a Study 

 in Animal Behaviour, By Raymond Pearl, Ph.D., Instructor 

 in Zoology in the University of Michigan, Ann Arbor, Michigan, 

 U.S.A 509 



On the Diplochorda. — Part IV. On the Central Complex of 

 Cephalodiscus dodecalophus, McI. By A. T. Masterman, 

 M.A., D.Sc, Lecturer on Zoology, School of Medicine, Edin- 

 burgh. (With Plates 32 and 33) . . . .715 



On Hypurgou Skeati, a new Genus and Species of Compound 

 Ascidians. By Igerna B. J. Sollas, B.Sc.Lond. (With Plates 

 34 and 35) 729 



The Anatomy of Arenicola assimilis, Ehlers, and of a New 

 Variety of the Species, with some Observations on the Post- 

 larval Stages. By J. H. Ashworxii, D.Sc. (With Plates 36 

 and 37) 737 



Title, Index, and Contents. 



