QUARTERLY JOURNAL , .^ 



MICROSCOPICAL SCIENCE. 



HONOUARY EDITOR : 



SiK RAY LANKESTER, K.C.B., M.A., D.Sc, LL.D., F.R.S. 



EDITOR : 



EDWIN S. GOODRICH, M.A., F.R.S. , 



PROFESSOR OF COMPAEATIVE 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 I'ROFESSOR OF COMPARATIVE ANATOMY IN THE UNIVERSITY OF OXIOKD ; 



J. GRAHAM KERR, M.A., F.R.S., 



BEGIUS PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OK GLASGOW ; 



E. W. MACBRIDE, M.A., D.Sc, LL.D., F.R.S., 



PROFESSOR OF ZOOLOGY AT THE IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOOV, 



G. P. BIDDER, M.A., ScD. 



VOLUME 66. New Series. 

 WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 



OXFORD UNIVERSITY PRESS, 

 HUMPHREY MILFOED, AMEN CORNEK, LONDON, E.G. 4. 



1922 



