CONTENTS. 
The Pigment Cells of the Retina. By J. 8. Bonrn and F. C. 
Sprawson, Students of Medicine, King’s College, London 
Observations upon the Development of the Segmentation Cavity, 
the Archenteron, the Germinal Layers, and the Amnion in 
Mammals. By Artur Rosinsoy, M.D., Senior Demonstrator 
of Anatomy at the Owens College, Manchester. (With Plates 
XXIII, XXIV, XXV, XXVI, and XXVIII). : : 
CONTENTS OF No. CXXXII, N.S., JUNE, 1892. 
MEMOIRS : 
Primitive Segmentation of the Vertebrate Brain. By Bertram 
H. Waters, A.B., HE. M. Fellow in oa (With Plate 
XXVIII) : ; 
The Oscula and Anatomy of Leucosolenia sceun O:S. 
By E. A. Mrvcaty, B.A., Assistant to the Linacre Professor of 
Human and Comparative Anatomy, Oxford. (With Plate XXIX) 
Researches into the Embryology of the Oligocheta. No. L— 
On Certain Points in the Development of Acanthodrilus 
multiporus. By Franx HE. Bepparp, M.A., Prosector of the 
Zoological Society of London. (With Plates XXX and XXXI) 
On the Innervation of the Cerata of some Nudibranchiata. By 
W. A. Herpmay, D.Sc., F.L.S., Professor of Natural History ; 
and J. A. Cups, Assistant in the Zoological Laboratory, Uni- 
versity College, Liverpool. (With Plates XXXII, XXXIII, 
and XXXIV) 5 ‘ : : : 
Notes on Elasmobranch Development. By Apam SrpGwIcK, 
M.A., F.R.S., Fellow and Lecturer of asa! eer Cam- 
bride. (With Plate XX XV) : 
On the Paired Nephridia of Prosobranchs, the Sih of the 
only remaining Nephridium of most Prosobranchs, and the Re- 
lations of the Nephridia to the Gonad and Genital Duct. By 
Dr. R. v. ERtancer. (With Plates XXXVI and XXX VII) 
TritLE, CoNnTENTS, AND INDEX. 
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