CONTENTS. v 



PAGE 



On the Anatomyof Allurus tetraedrus (Eisen). By Frank E. 

 Beddaed, M.A., Prosector to the Zoological Society, and Lec- 

 turer on Biology at Guy's Hospital. (With Plate XXV) . 365 



The Development of the Cape Species of Peripatus. Part IV. The 

 Changes from Stage G to Birth. By Adam Sedgwick, M.A., 

 F.R.S., Fellow of Trinity College, Cambridge. (With Plates 

 XXVI, XXVII, XXVIIl', and XXIX) . . . .373 



Oa the Occurrence of Numerous Nephridia in the same Segment in 

 Certain Earthworms, and on the Relationship between the Ex- 

 cretory System in the Annelida, and the Platyhelminths. By 

 Frank E. Beddard, M.A., Prosector to the Zoological Society 

 of London, and Lecturer on Biology at Guy's Hospital. (With 

 Plates XXX and XXXI) . . . .397 



The Anatomy of the Madreporaria, IV. By G. Herbert Fowler, 

 B.A., Ph.D., Assistant to the Jodrell Professor of Zoology in 

 University College, London. (With Plates XXXII and XXXIII) 413 



CONTENTS OF No. CXII, N.S., APRIL, 1888. 



MEMOIES : 



A Monograph on the Species and Distribution of the Genus 

 Peripatus (Guilding). By Adam Sedgwick, M.A., F.R.S., 

 Fellow of Trinity College, Cambridge. (With Plates XXXIV, 

 XXXV, XXXVI, XXXVII, XXXVIII, XXXIX and XL) . 431 



Notes on the Anatomy of Peripatus capensis and Peri- 

 patus Novae-zealandiae. By Lilian Sheldon, Bathurst 

 Student, Newnham College, Cambridge .... 495 



On the Construction and Purpose of the so-called Labyrinthine 

 Apparatus of the Labyrinthic Fishes. By Doctor Nicholas 

 Zograff, of Moscow. (With Plate XLl) . . . 501 



Studies on the Comparative Anatomy of Sponges. I. On the 

 Genera Ridleia, n. gen., and Quasillina, Norman. By 

 Arthur Dendy, M.Sc, F.L.S., Demonstrator and Assistant 

 Lecturer in Biology in the University of Melbourne. (With 

 Plate XLII) 513 



Kleinenberg on the Development of Lopadorbynchus. By G. C. 

 Bourne, B.A., F.L.S., Fellow of New College, Oxford, aud As- 

 sistant to the Linacre Professor in the University . . 531 



