£. I 
CONTENTS OF No. 226.-New Series. 
MEMOIRS : 
PAGE 
Contributions to the Study of Pathogenic Amoebae from Bombay. 
By W. Glen Liston, Major I.M.S., and C. H. Martin, B.A., 
Demonstrator of Zoology, Glasgow University. (With Plates 16- 
18) . . . . . .107 
The Division of the Collar-cells of the Calcarea Heterocoela. By 
Muriel Robertson, M.A. (With Plate 19) . . . 129 
Observations on the Trypanosome of the Little Owl (Athene 
noctua), with Remarks on the other Protozoan Blood-Parasites 
occurring in this Bird. By E. A. Minchin, M.A., F.R.S., and H. M. 
Woodcock, D. Sc. (With Plates 20 and 21) . . . 141 
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 Tech- 
nology, 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 Carcinus m senas. . . . 251 
The Effect of Sacculina upon the Fat Metabolism of its Host. By 
Guy C. Robson, B.A., Assistant in the Zoological Department, 
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 
