The Journal is issued on the second Wednesday of 

 February, April, June, August, October, and December. 



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^^1889. Parte. DECEMBER. {''"FrTcefr"^^ 



W^^ 



Journal 



OF THE 



Royal 

 Microscopical Society; 



CONTAINING ITS TRANSACTIONS AND PROCEEDINGS, 



AND A SUMMARY OK CURRENT RKSEARCHES RELATING TO 



(principally Invertebrata and Cryptogamla), 



Edited by 

 PRANK CRISP, LL.B., B.A., 



One of the Secretaries of the Society 

 and a Vice-President and Treasurer of the Linnean Society of London ; 



WITH THE ASSISTANCE OF THE PUBLICATION COMMITTEE AND 



A. W. BENNETT, M.A., B.Sc, F.L.S., F. JEFFREY BELL, M.A., F.Z.S., 



Lecturer on Botany at Si. Thomas's Hospital, Professorof Comparative Anatomy in Kin^^s College, 



JOHN MAYALL, Jun., F.Z.S., R. G. HEBB, M.A., M.D. (,Cantab.\ 



AND 



J. ARTHUR THOMSON, M.A., 



Lecturer on Zoology in the School of Medicine, Edinburgh, 

 FELLOWS OF THE SOCIETY. 



WILLIAMS & NORGATE. 



LONDON AND EDINBURGH. 



•Ht J V^ '--' 



^ 



FKINTED BY \VM. CLOWES AND SONS, LIMITED,] [.; 1 A M I 'JKD iTKEET ANT CHARING CROSS. 



