New Series. No. 266.] JULY, 1923. [Volume 67. Part II. 



THE 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



HONORARY EDITOR : 



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



EDITOR : 



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



LINACKE PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY 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. ; . 

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



REGIUS I'ROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF GLASGOW ; 



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



I'ROFESSOR 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, 



HUMPHREY MILFORD, AMEN CORNER, LONDON, E.G. 4. 



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