New Series. No. 258.] MARCH, 1921. [Volume 65. Part II. 
THE 
QUARTERLY JOURNAL 
MICROSCOPICAL SCIENCE. 
HONORARY EDITOR: 
sir RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.BS. 
EDITOR: 
EDWIN S. GOODRICH, M.A., F.R.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.R.S., 
LINACRE PROFESSOR OF COMPARATIVE ANATOMY IN THE UNIVERSITY OF OXFORD ; 
J. GRAHAM KERR, M.A., F.R.S., 
REGIUS PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF GLASGOW ; 
E. W. MACBRIDE, M.A., D.Sc., LL.D., F.B.S., 
PROFESSOR OF ZOOLOGY AT THE IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY 
G. P. BIDDER, MA., Sc.D. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
OXFORD UNIVERSITY PRESS, 
HUMPHREY MILFORD, AMEN CORNER, LONDON, E.C. 4. 
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