New Series, No. CXXVIII (Vol. XXXII, Part 4). Price 10s. 



yJol/y OCTOBER, 1891"^ ^^ ''" 



/ DEC ^'18Q1 



THE 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



BDITBD BY 



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



Honorary Fellow of Exeter College and Deputy Lhiacre Professor of Hitman and Comparative Anatomy 

 in the University of Oxford. 



WITH THK CO-OPKBATION OK 



E. KLEIN, M.D., E.R.S., 



Lecturer on General Anatomy and Physiology in the Medical School of St. Bartholomew's Hospital, 



London ; 



ADAM SEDOWICK, M.A., E.R.S., 



Fellou) a7td Assistant-Lecturer of Trinity College, Cambridge ; 

 AND 



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 Ov;ens College, Manchester. 



WITH LITHOGRAPHIC PLATES AND ENGEAVINGS ON WOOD. 



LONDON: 



J. & A. CHURCHILL, 11, NEW BURLINGTON STREET. 



MDCCCXCI. 



Adlard and Son,] [Bartholomew Close. 



