Journal 
OF THE 
Royal 
Microscopical Society; 
CONTAINING ITS TRANSACTIONS AND PROCEEDINGS, 
AND A SUMMARY OF CURRENT RESEARCHES RELATING TO 
ZOOLOGY 1ST ID BOTANY 
(principally Invertebrata and Cryptogamia), 
MICROSCOPY, eSco. 
Edited by 
P. JEFFREY BELL, M.A., 
One of the Secretaries of the Society , 
and Professor of Comparative Anatomy and Zoology in King's College ; 
WITH THE ASSISTANCE OF THE PUBLICATION COMMITTEE AND 
A. W. BENNETT. M.A., B.Sc., F.L.S., J. ARTHUR 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 1. 
PUBLISHED FOR THE SOCIETY BY 
WILLIAMS & NORGATE, 
^LONDON AND EDINBURGH. 
