/ 
QUARTERLY 
OP 
if* 
JOURNAL 
CY 
MICROSCOPICAL 
SCIENCE. 
EDITED BY 
Sib RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
HONORARY FKI.I.OW OK KXSTBR COI.I.KGK AND HONORARY STUDENT OF CHRIST CHURCH, OXFORD ; 
MEMBER OK T II K INSTITUTE OK K It A N C 1C (aSSOCIE STRANGER DE l/ACADKMIE DES SCIENCES) ; 
CORRESPONDENT OP THE IMPERIAL ACADEMY OP SCIENCES OP ST. PETERSBURG, AND OK THE 
ACADEMY «»K SCIENCES OK PHILADELPHIA, AND OP THE ROYAL ACADEMY OP SCIENCES 
op Turin; porkign member op the royal society op sciences op 
GOTTINGEN, AND OP THE ROYAL BOHEMIAN SOCIETY OP SCIENCES, AND 
OK THE ACADEMY OK THE MNCKI OP ROME, AND OP T II K AMERICAN 
ACADEMY OP ARTS AND SCIENCES OP BOSTON l ASSOCIATE OK THE 
ROYAL ACADEMY OP BELGIUM. HONORARY MEMBER >»K THE 
NEW YORK ACADEMY OP SCIENCES, AND OK TIIK 
CAMBRIDGE PHILOSOPHICAL SOCIETY, AND OK 
TUB ROYAL PHYSICAL SOCIETY OK EDIN- 
BURGH, AND OP THE 
BIOLOGICAL SOCIETY OP PARIS, AND OP THE CALIFORNIA ACADEMY OP SCIENCES OP SAN FRANCISCO, AND 
OK THE ROYAL ZOOLOGICAL AND M ALACOLOGIC A I. SOCIETY OK BELGIUM! 
CORRESPONDING MEMBER OP THE 8ENKENBERG ACADEMY OF FRANKFURTAM J 
PORKIGN ASSOCIATE OP THE NATIONAL ACADEMY OP SCIENCES, U-S., AND MEMBER OP TUB 
AMERICAN PHILOSOPHICAL SOCIETY ; 
HONORARY FELLOW OF THE ROYAL SOCIETY OK EDINBURGH*, 
LATE DIRECTOR it p TIIK NATURAL HISTORY DEPARTMENTS OP TIIK BRITISH MUSEUM; LATE PRESIDENT OK THE 
BRITISH ASSOCIATION FOR THF. ADVANCEMENT OP SCIENCE.* I.ATK PUI.I.KKIAN PROFESSOR OK 
PHYSIOLOGY IN TIIK ROYAL INSTITUTION OP GREAT BRITAIN . 
LATE LI N AC R R PROFESSOR OP COMPARATIVE ANATOMY AND FELLOW OP MERTON COLLEGE , OX PO R P ; 
EMERITUS PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN UNIVERSITY COLLEGE, UNIVERSITY OF LO N DON 
WITH THE CO-O PE RATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
FELLOW OK TRINITY COLLEGE, CAMBRIDGE, AND PROFESSOR OP ZOOI.OGY IN THE I M PE R I A I. COMKGK OK 
SCIENCE AND TECHNOLOGY, LONDON; 
SYDNEY J. HICKSON, M.A., E.R.S., 
BKYRR PI<OKI<SSOI< OK ZOOLOGT IN T II R UNIVERSITY OK M A N C II K ST K R , 
E. A. MINCHIN, M.A., F.R.S., 
PROFESSOR OK PRO I OZOOI.OGY IN THE UNIVERSITY OK LONDON; 
AND 
GILBERT C. BOURNE, M.A., D.Sc., F.R.S., 
I.INACRK PROFESSOR OF COMPARATIVE ANATOMY, AND FKI.I.OW OP MERTON COLLEGE, OXFORD. 
VOLUME 57. — New Series. 
©Itib ^’itbograplm JMnUs nnb ft **t-<Jfigur*s, 
LONDON: 
J & A. CHURCHILL, 7, GREAT MARLBOROUGH STREET. 
19J2. 
