QUARTERLY JOURNAL 



MICROSCOPICAL SCIENCE: 



EDITED BY 



E. RAY LANKESTER, M.A., LL.D., F.R.S., 



Linacre Professor of Human and Comparative Anatomy, Felloio of Merton College, and 

 Honorary Fellow of Exeter College, Oxford. 



WITH THE CO-OPEEATION OF 



ADAM SEDGWICK, M.A., F.R.S., 



Fellmo and Lecturer of Trinity College, Cambridge ; 



A. MILNES MARSHALL, M.A., D.Sc, M.D., F.R.S., 



Late Fellow of St. John's College, Cambridge; Professor in the Victoria University , 

 Beyer Professor of Zoology in the Otvens College, Manchester ; 



W. F. R. WELDON, M.A., F.R.S., 



Jodrell Professor of Zoology and Comparative Anatomy in University College, London; 

 Fellow of St. John's College, Cambridge. 



VOLUME XXXIV.— Neav Series. 

 Mitli |'itl:)ograp^k ^laUs nnh €ngrabings on 3!5loob. 



LONDON: 



J. & A. CHURCHILL, II, NEW BURLINGTON STREET, 

 1893. 



