I S- h' . 
aUARTERLY 
OF 
JOURNAL 
MICROSCOPICAL SCIENCE 
EDITED BY 
E. RAY LANKESTER, M.A., F.R.S., F.L.S., 
Fellow of Exeter College, Oxfords, and Professor of Zoology and Comparative 
Anatomy in University College, London ; 
WITH THE CO-OPEEATION OF 
WILLIAM ARCHER^ F.R.S., M.R.I.A., 
Dublin. 
F. M. BALFOUR, M.A., F.R.S., F.L.S., 
^ Fellow and Lecturer of Trinity College, Cambridge. 
AND 
E. KLEIN, M.D., F.R.S., 
Lecturer on Histology in St. Sartholometv's Hospital Medical School^ London, 
VOLUME XX.— New Seeies. 
lllwstralions on anb 
L O B O N : 
J. & A. OHURCIllLL, NEW BUETJNGTON STREET. 
