Journal 
OF THE 
Royal 
Microscopical Society; 
CONTAINING ITS TRANSACTIONS AND PROCEEDINGS, 
AND A SUMMARY OF CURRENT RESEARCHES RELATING TO 
ZOOI-.OC3-Y ^ISriD 
(principally Invertebrata and Cryptogamia), 
ivd:ici^oscoi>^, <scc. 
Edited by 
F. 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., I JOHN MAYALL, Jun., F.Z.S., 
Lecturer on Botany at St. Thomases Hospital, | R. Q-. HEBB, M.A., M.D. (gCantabl)^ 
AND 
J. ARTHUR THOMSON, M.A., 
Lecturer on Zoology hi the School of Medicine, Edinburgh, 
FELLOWS OF THE SOCIETY. 
FOR THE YEAR 
1890 . 
PUBLISHED FOR THE SOCIETY BY 
WILLIAMS & NORGATE, 
^ LONDON AND EDINBURGH. 
