The Journal is issued on the third Wednesday of 
February, April, June, August, October, and December. 
1890. Part 3. 
JUNE. 
<To Non -Fellows 
\ Price 6s. 
Journal 
OF THE 
Royal 
Microscopical Society; 
CONTAINING ITS TRANSACTIONS AND PROCEEDINGS, 
AND A SUMMARY OF CURRENT RESEARCHES RELATING TO 
ZOOILOO-Y 
(principally Invertebrata and Cryptogamia), 
3SA <Scc. 
Edited by 
F.. JEFFREY BELL, M.A., 
One of the Secretaries of the Society 
and Professor of Comparative Anatomy and Zoology in JCing'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. Thomas's Hospital, | R. G. HEBB, M.A., M.D. {fdantabl)^ 
AND 
J. ARTHUR THOMSON, M.A., 
Lecturer on Zoology in the School of Medicine, Edinburgh, 
FELLOWS OF THE SOCIETY. 
printed by W.M. CLOWES AND SONS, LIMITED,] 
[STAMFORD STREET AND CHARING CROSS. 
