CONTENTS OF No. 225-New Series. 
MEMOIRS : 
PAGE 
The Spermatogenesis of Lepidosiren Paradox a. By W. E. 
Agar, M.A., D.Sc., Zoological Laboratory, Glasgow University. 
(With Plates 1-5 and 1 Text-figure) . . . 1 
Studies in the Experimental Analysis of Sex. By Geoffrey Smith, 
M.A., Fellow of New College, Oxford. Part 6. — On the Cause of 
the Fluctuations in Growth of the Fowl’s Comb. (From the 
Department of Pathology, University of, Oxford.) With Plates 
6-9 and 5 Text-figures) . . . . .45 
Further Observations on the Caeca! Parasites of Fowls, with some 
reference to the Eectal Fauna of other Vertebrates. Part I. 
By C. H. Martin, M.A., Demonstrator of Zoology at Glasgow 
University, and Muriel Eobertson, M.A., Junior Assistant to the 
Professor of Protozoology in the University of London. (With Plates 
10-14 and 4 Text-figures) . . . . .53 
On Some Points in the Anatomy and Bud-Formation of Limnocnida 
tanganicae. By Charles L. Boulenger, M.A., Lecturer on 
Zoology in the University of Birmingham. (With Plate 15 and 3 
Text -figures) . . . . . .83 
