New Series, No. 232 (Vol. 58, Part 4). Price lOs. net. 
Subscription per volume (of 4 parts) 40s. net. 
MARCH, 1913. 
ThlK 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
EDITKI) HY 
Sje ray LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
IIONOBAET FBM.UW OF BXBTBB COI.T.K6B AND IIONORART 9TUDRNT OP CUKlST CHURCH, OXFORD ; 
MBMBBR OF TUB INSTITUTB OF FKAIfCN (ABSOCii UtRANOBR DB li'ACADBMIB DBS SCXBNCBs) ; 
COBBBSPUNOB.NT OF TUB IMPBRIAI. ACADHMT OF BC1BNCH8 OF ST. PHTHU8BUR6. AND OF TUB 
ACADBMT OF 8CIBNCK8 OF P II 1 1. A DB l.F II I A , AND OF TUB ROTAI. ACADRMT OF SCIUNCBS 
OF TURIN; FORKION MBMBBR OF TUX ROTAD 8UC1RTY OF 8CIBNCBS OF 
cOTTINOBN, AND OF TUB RUTAI. 80IIBMIAN 80CIRTT OF SCIUNCBS, AND 
OF TUB ACADBMT OF TUB MNCRI OF ROMR, AND OF T II H AMXUICAN 
ACADBMT OF ARTS AND 8CIBNCKS OF BOSTON I A880C1ATK OF THN 
ROTAl. ACADRMT OF BBI.QIUM; lIONUBAnV MRMOBR OF TUB 
NBW YORK ACADBMT OF SCIKNCBS, AND OF TUB 
CAMBRIDOB P 11 II.O 8 OP II 1C A I. 80CIRTT, AND OF 
TUB BOTAD PHTSICAt. 80CIKTT OF BUIN* 
BURG It. AND OP TUB 
BIOLOGICAl. 80CIXTT OK PARIS. AND OF TUB CAI.IFOUNIA ACADRMT OF SCIKNCBS OF SAN FRANCISCO, AND 
OF THR ROTAl. tOOLOGICAf. AND M ALA C0I.O61C A I. 80C1XTT OF BBLGIUM; 
CORRESPONDING MRMBBK OP TUX SKNSHNBBRO ACADKMT OP P R AN K PU RT- A' M ; 
POBXIGN ABSOCIATB OP TUX NATIONAL ACADBMT OF SCIRNCKS. U.8.. AND »l X M B K K OP TUB 
AMBRICAN rUILOSOPHICAL SOCIRTT ; 
llONORART PBLT.OW UP THR ROYAL SOCIETY OF EDINBURGH; 
LATB DIRBCTOR OF TUB NATUHAI. UlSTOKT nRPAUTMKNTS OF TUB JIHITISII MUSEUM; LATE PRRSIDRNT OF THE 
BRITISH ASSOCIATION FOR TUB ADPANCBMKNT OF 8CIKNCR; LATE F II 1,1. B K I A N PROFRSSOH OF 
r II rsiol.ooY in tub royal institution of great Britain. 
r.ATR T.INACRB PROFXBSOR OF COMPARATIVE ANATOMT AND PRI.I.OW nP MRKTON C OLI.XG X , O X FO K D ; 
■ MBR1TU8 PBOFBSSOR OP 20OI.O0T AND COHPARATITB ANATOMT IN VNIVBRSITT COI.LKOB, VNIVBRSITY OF LONDON 
WITH TllK CO-OPKUATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
FBLLOW OP TRINITY COLI.BGB, CAMBRIDGE, AND PROFBSSOR OF ZOOLOGY IN TUX IMP8 RIAL COM.BOB OF 
8CIRNCB AND TKCUNOI.OGT, LONDON; 
SYDNEY J. HICKSON, M.A., F.lt.S., 
BRTRR FROFKSSOK OF ZOOLOGY IN TUX UNtVBRSITT OF MANCIIKSTKR. 
E. A. MINCHIN, M.A., F.R.S., 
PROFESSOR OF PROTOZOOLOGY IN T II X UNIVERSITY OF LONDU.N; 
AND 
GILBERT C. BOURNE, M.A., D.Sc., F.R.S., 
LINACRB PROFESSOR OF COMPARATIVB ANATOMY. AND FELLOW OF MERTON COLLEGE, OXFORD. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES 
LONDON . 
J. & A. CHURCHILL, 7 GREAT MARLBOROUGH STREET. 
1913. 
Adlard and Son, Impr.,] 
[London and Dorking 
