CON T E N T S 
CONTENTS OF No. 233, N.S., MAY, 1913. 
MEMOIRS: 
The Development of Symbranchus marmoratus. By Monica 
Taylor, S.N.D., B.Sc. (With Plates 1 to 4 and 4 Text-Figures) 
4'he Development of the Heart and Vascular System of Lepido- 
siren par ad ox a. By Jane I. Robertson, M.B., Carnegie 
Research Scholar, Glasgow University. (With Plate 5 and 31 
Text-figures) ...... 
The Reproductive Cycle in the Marsupial D a s y u r u s v i v e r r i n u s. 
By J. P. Hill, D.Sc.(Edin.), Jodrell Professor of Zoology and 
Comparative Anatomy, and Chas. H, O’Donoghue, D.Sc.(Lond.), 
Beit Memorial Fellow. (From the Zoological Laboratory, 
University of London, University College.) (With Plates 6 to 8) 
Further Observations on the Intestinal Trypanoplasmas of Fishes, 
with a Note on the Division of Try panoplasma cyprini in 
the Crop of a Leech. By C. H. Martin, M.A. (With Plates 9 
and 10 and 2 Text-figures) . . . . 
CONTENTS OF No. 234, N.S., JULY, 1913. 
MEMOIRS : 
Notes on the Histriobdellidie. By W. A. Haswell, M.A., D.Sc., 
F.R.S., Challis Professor of Biology, University of Sydney. 
(With Plates 11 to 14 and 1 Text-figure) 
Metameric Segmentation and Homology. By Edwin S. Goodrich, 
F.R.S., Fellow of Merton College, Oxford. (With Plates 15 and 
16) ...... . 
The Metaphase Spindle in the Sperniatogenetic Mitoses of For- 
ficula auricularia. By C. F. U. Meek, M.Sc., F.L.S., F.Z.S. 
(With Plate 17) . 
Studies in the Experimental Analysis of Sex. Part 10. — 1 he 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) 
Studies on Parasitic Protozoa. I. The Flagellate Polyniastix 
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) . 
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