New Series, No. CXXXIV (Vol. XXXIV, Part 2). fritse iOs. 



%^^y. NOVEMBEE, 1892. !§ 



THE 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



SBIIED BT 



E. EAY LANKESTER, M.A., LL.D., E.R.S., 



Linacre Trofessor of Human and Conipara/ire Jnotomy, Fellow of Merton Colhge, and 

 Eonorafy Fellow of Exeter College, Oxford ; 



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



Fellou) and Lecturer of Trinity College, Cambridge ; 



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



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

 in the Oioens College, Manchester. 



WITH LITHOGRAPHIC PLATES AND ENGRAVINGS ON WOOD. 



LONDON: 

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



MDCCCXCII. 



Adlard and Son,] [Bartholomew Close. 



