CONTENTS. 



CONTENTS OF No. 181, N.S., JULY, 1903. 

 MEMOIRS: 



PAGE 



On a rree-swimming Hydroid, Pelagohydra mirabilis, n. gen. 

 et sp. By Aktiiuk Dendy, D.Sc, F.L.S., Professor of Biology 

 in tlie Canterbury College, University of New Zealand. (Witii 

 Plates 1 and 2) . . . . . . .1 



Studies in the Retina. Parts III, IV, and V, with Summary. By 

 Henry M. Bernard, M.A.Cantab. (From the Biological 

 Laboratories of the Royal College of Science, London.) (With 

 Plates 3—5) ....... 25 



Notes on the Relations of the Kidneys in Haliotis tuberculata, 

 etc. By H, J. Fledre, B.Sc, U.C.W., Aberystwyth. (With 

 Plate 6) . . . . . . . .77 



Notes on the Development of Paludina vivipara, with special 

 reference to the Urino-genital Organs and Theories of Gasteropod 

 Torsion. By Isabella M. Drbmmond. (With Plates 7 — 9) . 97 



Is Chemotaxis a Factor in the Fertilisation of tlie Eggs of 

 Animals? By A. H. Reginald Buller, B.Sc, Ph.D., Demon- 

 strator in Botany at the University of Birmingham . .145 



CONTENTS OF No. 182, N.S., SEPTEMBER, 1902. 



MEMOIRS : 



Maturation of the Ovum in Echinus esculent us. By Thomas 

 H. Bryce, M.A., M.D. (With Plates 10—12) . . .177 



Studies on the Arachnid Entosternite. By R. I. Pocock. (With 

 Plates 13 and 14) ..... . 225 



