Journal 
OF THE 
Royal 
Microscopical Society 
CONTAINING ITS TRANSACTIONS AND PROCEEDINGS, 
AND A SUMMARY OF CURRENT RESEARCHES RELATING TO 
z o o l og-y -A-Intid botany 
(principally Invertebrata and Cryptogamia), 
MICROSCOPY, <3so_ 
Edited by 
F. JEFFREY BELL, M.A., 
One of the Secretaries of the Society 
and Professor of Comparative Anatomy and Zoology in Kinfs College ; 
WITH THE ASSISTANCE OF THE PUBLICATION COMMITTEE AND 
A. W. BENNETT, M.A., B.Sc., F.L.S., J. ARTHUK THOMSON, M.A., 
Lecturer on Botany at St. Thomas's Hospital, Lecturer on Zoology in the School of Medicine, 
R. G. HEBB, M.A., M.D. ( Cantab .), and Edinburgh, 
FELLOWS OF THE SOCIETY. 
FOR THE YEAR 
1891. 
Part 2. 
PUBLISHED FOR THE SOCIETY BY 
WILLIAMS & NORGATE, 
LONDON AND EDINBURGH. 
