New Series. No. 257.] DECEMBER, 1920. [Volume 65. Part I. 
THE 
QUARTERLY JOURNAL 
MICROSCOPICAL SCLENCE. 
HONORARY EDITOR: 
Sir RAY LANKESTER, K.C.B., M.A, D:Se., GL.D), ERS. 
EDITOR : 
EDWIN S. GOODRICH, M.A., F.RB.S., 
PROFESSOR OF COMPARATIVE EMBRYOLOGY IN THE UNIVERSITY OF OXFORD ; 
WITH THE CO-OPERATION OF 
SYDNEY J. HICKSON, M.A., F.R.S., 
BEYER PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF MANCHESTER ; 
GILBERT C. BOURNE, M.A., D.Sc. F.BS.. 
LINACRE PROFESSOR OF COMPARATIVE ANATOMY IN THE UNIVERSITY OF OXFORD ; 
J. GRAHAM KERR, M.A., F.RB.S., 
REGIUS PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF GLASGOW ; 
E. W. MACBRIDE, M.A., D.Sc., LL.D., F.RB.S., 
PROFESSOR OF ZOOLOGY AT THE IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY ; 
G. P. BIDDER, M.A., Sc.D. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
OXFORD UNIVERSITY PRESS, 
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