CONTENTS 
CONTENTS OF No. 229, N.S., SEPTEMBER, 1912. 
MEMOIES : PAGE 
The Structure and Development of Eeissner’s Fibre and the Sub- 
commissural Organ. Part 1. By George E. Nicholes, B.Sc., 
P.L.S., Professor of Biology at the Agra College, University of 
Allahabad. (From the Zoological Department, King’s College, 
University of London.) (With Plates 1-5 and 8 Text-figures) . 1 
Loxosoma loxalina and Loxosoma saltans — Two New 
Species. By Eichard Assheton, M.A., Lecturer on Biology in 
Guy’s Hospital, University of London. (With Plates 6 and 7 
and 4 Text-figures) . . . . .117 
Gastrulation in Birds. By Eichard Assheton, M.A., Lecturer 
on Physiology in Guy’s Hospital, University of London . 145 
Studies in the Experimental Analysis of Sex. Part 9. — On Sperma- 
togenesis and the Formation of Giant Spermatozoa in Hybrid 
Pigeons. By Geoffrey Smith, M.A., Fellow of New College, 
Oxford. (With Plate 8) . . . . . 159 
Notes on Sporozoa. Nos. II, III, and IV. By H. M. Woodcock, 
D.Sc., Lister Institute of Preventive Medicine, London. (With 
Plates 9 and 10) : — 
II. — Observations on Karyolysus lacertae (Danil.), and 
Eemarks upon other Haemogregarines of Lizards . .172 
III. — Comparison of the Nuclear Condition in Haemogregarines 
with that in Certain Coccidia .... 196 
IV. — The Nuclear Structure of Leucocytozoon and Hal- 
teridium ...... 215 
The Dorsal Vibratile Fin of the Eockling (MoteUa). By J. Stuart 
Thomson, Ph.D., F.L.S., F.E.S.E., Lecturer and Senior Demon- 
strator in Zoology, University of Manchester. (With Plate 11) 241 
CONTENTS OF No. 230, N.S., DECEMBER, 1912. 
MEMOIES : 
Two New Species of the Phoronidea from Vancouver Island. By 
H. L. M. PixBLL, B.Sc., F.Z.S., Demonstrator of Zoology and 
Eeid Fellow, Bedford College, University of London. (With 
16 Text-figures) ...... 257 
