1V CONTENTS, 
CONTENTS OF No. CXXX, N.S., JANUARY, 1892. 
MEMOIRS: 
On Onchnesoma Steenstrupii. By Artuur HE. Surptey, 
M.A., F.L.S., Fellow and Lecturer of Christ’s College, Cam- 
bridge, and Demonstrator of Comparative Anatomy in the Uni- 
versity. (With Plate IX) 
Note on a Sieve-like Membrane across the Oscula of a Species 
of Leucosolenia, with some Observations on the Histology of 
the Sponge. By Epwarp A. Mincaty, Assistant to the Linacre 
Professor of Human and Comparative Anatomy in the Uni- 
versity of Oxford. (With Plates X and XI) 
The Development of the Oviduct in the Frog. By Ernest W. 
MacBripz, B.A.Cantab., B.Sc.Lond., Scholar of St. John’s 
College, and Scholar of the University of London. (With 
Plates XII and XIII) ; é : ' 
Onthe Nauplius Eye persisting in some Decapods. By Marcaret 
Rosinson, University College, London. (With Plate XLV) 
Notes on Two Acanthodriloid Harthworms from New Zealand. 
By W. Buaxtanp Brennam, D.Sc.Lond., Aldrichian Demon- 
strator of Anatomy in the University of Oxford. (With Plates 
XV and XVI) : : ‘ 5; 
On a New Genus of Synascidians from Japan. By Asasrro Oxa, 
of the Imperial University of Tokio, and Artaur WILLEY, 
B.Sc.Lond. (With Plates XVII and XVIII) . 
CONTENTS OF No. CXXXI, N.S., MARCH, 1892. 
MEMOIRS : 
A New Branchiate Oligochete (Branchiura Sowerbyi). By 
Frank KH. Bepparp, M.A., Prosector to the Zoological Society 
of London, Lecturer on Rickey at ee sacs (With 
Plate XIX) ‘ 4 : J 
The Formation of the Germ-layers in aan vulgaris. By 
W. F. R. Weupvon, M.A., F.R.S., Fellow of St. John’s College, 
Cambridge ; Jodrell Professor of Zoology in University College, 
London. (With Plates XX, XXI, and XXII) . : 
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