New Series, No. 215 (Vol. 54, Part 3). Price 10s. net. 
Subscription per volume (of 4 parts) 40s. net. 
1909. 
JOURNAL 
MICROSCOPICAL SCIENCE. 
EUlTKh KY 
I Sir ray LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
I HOr«UMAtlT VBLLOW or BXKTBR C OLI.R GB , OX KO K D ; C<' K R E8 P UN D B X T OK TUB INSTITUTB OK KHANCB* 
I AND OP THB lUPKKIAt. ACADEMY OP 8C1KNCK8 OP 8T. PBTKH8BUK6, AND OP THE ACADBMY 
I OP 8CI8NCB8 OF FBILADEI.PIIIA, AND OP THE ROYAL ACADEMY OP SCIENCES 
I OK TURIN; koreign member ok tub royal society op sciences op 
i edTTlNGE.N, and op tub royal BOIIBMIAN SOCIETY OP SCIB.NCBS, AND 
I OP TUS ACADBMY OP THE MNCEI OP ROME« AND OP TUR AMERICAN 
ACADEMY OP ARTS AND SCIENCSS OP BOSTON ; A8SOCIATK OP TUB 
BOYAI> ACADB.MY OP BKJ.GIUM; HONORARY MEMBER OP TUB 
I NEW YORK ACADLMY OP 8C1KNCK8, AND OP TUR 
I CAAtBRIDGB P U I f.O S OP U tCAL SOCIETY, AND OP 
TUB ROYAL PHYSICAL 80CIKTY OP KDIN- 
I BURGH, ANDOPT HE 
j niOLOGICAL BUCIBTT op FARIB, AND OP THE CALIFORNIA ACADEMY OP SCIE.NCKS OP SAN PRANCISCO. AND 
OP THE ROYAL ZOOLOGICAL AND MALACOLOOICAL SOCIETY OP BELGIUM ; 
CORRESPONDING ME3IBBR OP THE SKNKBNBERG ACADEMY OP PR AN K PU RT'A'31 ; 
P0RR16N ASSOCIATE OP TUB NATIONAL ACADEMY OP SCIENCES, U«8., AND MEMBER OP THE 
A31KRICAN PHILOSOPHICAL SOCIETY ; 
HONORARY FELLOW OP THE ROYAL SOCIETY OP EDINBURGH’, 
LATE DIRECTOR OP TUB NATURAL HISTORY DBPARTMBNT8 OP TUB BRITISH MU8KU.M; LATE PRESIDENT OP THE 
BRITISH ASSOCIATION FOR TUE ADVANCEMENT OP SCIENCR,* LATB PUM>KRIAN PKOPKSSOR OP 
PHYSIOLOGY IN THE ROYAL INSTITUTION OP GREAT BRITAIN ; 
LATE I.IXACRB PROFESSOR OP C031PARAT1VR ANAT03IY AND FELLOW OP MERTON COI.LE G E , OX PO R D « 
PMERITUS PBOPBSSOR OP ZOOLOGY A N D C03I P A R ATI VE ANAT03IY IN UNIVERSITY COLLEGE. UNIVERSITY OP LONDON. 
WITH THE CO-OPEUATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
FELLOW OP TRINITY COLLEGE, CAMBRIDGE. AND PKOPP.SSOR OP ZOOLOGY IN TUB IMPERIAL COLLEGE OP 
SCIENCE AND TECIINOLOGY, LONDON. 
SYDNEY J. HICKSON, M.A., F.R.S., 
BEYER PROFESSOR OP ZOOLOGY IN THE UNIVERSITY OP MANCIIKSTKK’, 
AND 
E. A. MINCHIN, M.A., 
PROFESSOR OP PROTOZOOLOGY IN THE UNIVERSITY OP LONDON. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
LONDON. 
J. & A. CHURCHILL, 7 GREAT MARLBOROUGH STREET. 
1909. 
DECEMBER, 
THE 
QUARTERLY 
OF 
Afllard and Son, Impr.,] 
[London and Dorking, 
