IV 
CONTENTS. 
PAGE 
The Growth-Changes in the Mammary Apparatus of Dasyurus 
and the Relation of the Corpora Lutea thereto. By Chas. H. 
O’Donoghue, B.Sc., F.Z.S., Assistant to the Jodrell Professor 
of Zoology, University College, London. (With Plates 22 and 
23 and 2 Text-figures) ..... 187 
Two Abnormal Plutei of Echinus, and the light which they throw 
on the Factors in the normal development of Echinus. By 
Prof. E. W. MacBride, D.Sc., LL.D., F.R.S., Chief Assistant in 
the Department of Zoology, Imperial College of Science and 
Technology, London. (With Plate 24 and 2 Text-figures) . 235 
Studies in the Experimental Analysis of Sex. By Geoffrey 
Smith, M.A., Fellow of New College, Oxford. Part 7. — Sexual 
Changes in the Blood and Liver of Car cinus m aenas. . 251 
The Effect of Sacculina upon the Fat Metabolism of its Host. 
By Guy C. Robson, B.A., Assistant in the Zoological Depart- 
ment, British Museum. (With 2 Text-figures) . . 267 
A Note on the Early Stages of Nuclear Division of the large 
Amoeba from Liver Abscesses. By C. H. Martin, M.A. (With 
7 Text-figures) . . . . . .279 
CONTENTS OF NO. 227, N.S., FEBRUARY, 1912. 
MEMOIRS : 
On the Condition of the Epidermal Fibrils in Epithelioma. By 
George Arnold, M.Sc., from the Cancer Research Laboratory, 
University of Liverpool. (With Plate 25 and 1 Text-figure) . 283 
Note on the Mechanism of Discharge of the Cuvierian Organs of 
Holothuria nigra. By George Ralph Mines, M.A., Fellow 
of Sidney Sussex College, Cambridge (from the Laboratory of 
the Marine Biological Association, Plymouth). (With Plate 26) 301 
On the Histological Structure of the Retina of the Lateral Eyes 
of Sphenodon punctatus, with Special Reference to the 
Sense-cells. By Freda Bage, M.Sc. (Melbourne), F.L.S. (from 
the Zoological Department, King’s College, University of 
London). (With Plates 27-29) .... 305 
The Problem of Sex Determination in Dinophilus gyro- 
ciliatus. Part 1. — The Sexual Cycle. By Cresswell 
Shearer, M.A., Clare College, Cambridge. (With Plates 30-34 
and 5 Text-figures) . . . . 329 
