



New Series, No. CXXVII (Vol. XXXII, Part 3). Price 10s. 



/ JUNE, 1891. 



THE 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



BDIIBS BT 



E. RAY LANKESTER, M.A., LL.D., E.K.S., 



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

 in the University of Oxford. 



WITH THK CO-OPKRATION 0¥ 



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



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



London, 



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



Fellow and Assistant-Lecturer of Trinity College, Camhridye. 

 AND 



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



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

 in the Ovjens College, Manchester. 



WITH LITHOGRAPHIC PLATES AND ENGRAVINGS ON WOOD. 



LONDON: 



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



MDCCCXCI. 



Adlard and Son,] 



[Bartholomew Close. 



