QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE 
EDITED BY 
EH. RAY LANKESTER, M.A., F.R.S., F.LS., 
Fellow of Exeter College, Oxford, and Professor of Zoology and Comparative 
Anatomy in University College, London ; 
WITH THE CO-OPERATION OF 
Poe BALFOUR,. L.L.D., F.R.S., F.L.S., 
Fellow and Lecturer of Trinity College, Cambridge ; 
W. T. THISELTON DYER, M.A., F.R.S., F.LS., 
Assistant Director of the Royal Gardens, Kew ; 
AND 
E. KLEIN, M.D., F.RB.S., 
Lecturer on Histology in St. Bartholomew's Hospital Medical School, London. 
VOLUME XXI.—New Szrizs. 
With Lithographic Plates and Engrabings on Wood. 
LONDON: 
J. & A. CHURCHILL, NEW BURLINGTON STREET. 
c 1881, 
