( ; ( 
CONTENTS or No. 234,-New Series. 
MEMOIES ; 
PAGE 
Notes on the Histriobdellidse. By W. A. Haswell, M.A., D.Sc., 
F.E.S., Challis Professor of Biology, University of Sydney. (With 
Metameric Segmentation and Homology. By Edwin S. Goodrich, 
F.R.S., Fellow of Merton College, Oxford. (With Plates 15 and 16) 227 
The Metaphase Spindle in the Spermatogenetic Mitoses of Forficnla 
auricularia. By C. F. U. Meek, M.Sc., F.L.S., F.Z.S. (With 
Studies in the Experimental Analysis of Sex. Part 10. — The Effect 
of Sacculina on the Storage of Fat and Glycogen, and on the 
Formation of Pigment by its Host. By Geoffrey Smith, M.A., 
Fellow of New College, Oxford. (With 1 Text- figure) . . 267 
Studies on Parasitic Protozoa. I. The Flagellate Polymastix 
and its Affinities with the Trichonymphidse. By Doris L. Mac- 
Kinnon, B.Sc., Assistant in the Zoology Department, University 
College, Dundee. (With Plate 18 and 1 Text-figure) . . 297 
Studies on the Development of the Veno-Lymphatics in the Tail- 
region of Polistotrema (Bdellostoma) stouti. First Com- 
munication: Formation of the Caudal Hearts. By William F. 
Allen. Publication No. 11 from the Zoological Laboratory of the 
University of Illinois, Urbana, Illinois. (With Plates 19 to 21) . 309 
Plates 11 to 14 and 1 Text-figure) 
. 197 
Plate 17) . 
249 
