QUARTERLY JOURNAL 



OP 



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. . 



LINACRE PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY 

 IN THE UNIVERSITY OF OXFORD ; 



WITH THE CO-OPERATION (IF 



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. ; 

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



REGIUS PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OK GLASGOW ; 



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



PROEF.SSOR OF ZOOLOGY AT THE IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY; 



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



VOLUME 67. New Series. 

 WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES 



OXFORD UNIVERSITY PRESS, 



HUMPHREY MILFORD, LONDON, P].C.4. 

 1923 



