New Series. No. 267.] OCTOBER, 1923. [Volume 67. Part III. 



THE 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



HONORABY EDITOR: 



Sir ray LANKESTER, K.C.B., M.A., D.Sc, LL.D., F.R.S. 



EDITOR : 



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



LIKACRE PROFESSOK OF ZOOLOGY AND GOMfARATIVE ANATOMV IN THE UNIVEHSITV OF OXFOBD ; 

 WITH THE CO-OPEBATION OF 



SYDNEY J. HICKSON, M.A., F.R.S., 



BEYER PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF HANCHESTEB; 



GILBERT C. BOURNE, M.A., D.Sc, F.R.S. ; 

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



BEGIUS PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF GLASGOW; 



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



PROFESSOR OF ZOOLOGY AT THE IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY ; 



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



WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 



OXFORD UNIVERSITY PRESS, 



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