New Series. No. 259.] AUGUST, 1921. [Volume 65. Part III. 
THE 
QUARTERLY JOURNAL 
MICROSCOPICAL SCIENCE 
HONORARY EDITOR: 
Str RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.B.S. 
EDITOR: 
EDWIN S. GOODRICH, M.A., F.RBS., 
LINACRE PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN THE UNIVERSITY OF OXFORD, 
WITH THE CO-OPERATION OF 
SYDNEY J. HICKSON, M.A, F.RBS., 
BEYER PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF MANCHESTER 5 
GILBERT C. BOURNE, M.A., D.Sc, F.R.S. 
J. GRAHAM KERR, M.A., F.B.S., 
REGIUS PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF GLASGOW ; 
E. W. MACBRIDE, M.A., D.Sc., LL.D., F.B.S., 
PROFESSOR OF ZOQLOGY 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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