IV CONTENTS. 



CONTENTS OF No. CXXVI, N.S., MARCH, 1891. 



MEMOIRS : PAGE 



On a New Species of Phymosoma, with a Synopsis of the Genus 

 and some Account of its Geographical Distribution. By Arthur 

 E. Shipley, M.A., F.L.S., Fellow and Lecturer of Christ's 

 College, Cambridge, and Demonstrator of Comparative Anatomy 

 in the University. (With Plate XI) . . . . Ill 



On the British Species of Oris ia. By Sidney F. Harmer, M.A., 

 B.Sc, Fellow and Lecturer of King's College, Cambridge. 

 (With Plate XII) 127 



The Later Larval Development of Amphioxus. By Arthur 

 WiLLEY, B.Sc. (of University College, London). (With Plates 

 XIII-XV) 183 



On the Structure of Two New Genera of Earthworms belonging 

 to the Eudrilidse, and some Remarks on Nemertodrilus. 

 By Frank. E. Beddard, M.A., Prosector to the Zoological So- 

 ciety of London. (With Plates XVI— XX) . . .235 



CONTENTS OF No. CXXVII, N.S., JUNE, 1891. 



MEMOIRS : 



The Renal Organs of Certain Decapod Crustacea. By W. F. R. 

 Weldon, M.A., F.R.S., Jodrell Professor of Zoology and Com- 

 parative Anatomy in University College, London ; Fellow of St. 

 John's College, Cambridge. (With Plates XXI & XXII) . 279 



The Nephridium of Lumbricus and its Blood Supply ; with Re- 

 marks on the Nephridia in other Chsetopoda. By W. Blaxland 

 Benham, D.Sc.(Lond.), Anatomical Department, Oxford. (With 

 Plates XXIII-XXV) 293 



Notes on the Naidiform Oligochseta ; containing a Description of 

 New Species of the Genera Pristina and Pterostylarides, and 

 Remarks upon Cephalization and Gemmation as Generic and 

 Specific Characters in the Group. By Alfred Glbbs Bourne, 

 D.Sc.(Lond.), C.M.Z.S., F.L.S., Fellow of University College, 

 London ; Fellow of the Madras University ; Professor of Bio- 

 logy in the Presidency College, Madras. (With Plates XXVI & 

 XXVII) 335 



