New Series, No. 230 (Vol. 58, Part 2). Price 10s. net. 
Subscription per volume (of 4 parts) 40s. net. 
DECEMBER, 1912. 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
EDITKI) HY 
Sir ray LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
IIONOHART FBI.I.OW OK K.XRTRU COl.f.RGR A>D IIO><ORARY .STUDENT OP CBUIST CUUUCU, OXKORD; 
BIEMBEU OK TIIK {.SSriTUTR OK KKANCK (aSSUCI^ ^TBANOlSa DB i/aCADE> 11E DBS SCIB.NCBS) ; 
COhKKSP(»St*R.'<7 OK TIIK IMPRRIAI. ACAUKMY OK 8CIKNCKS OF ST. PRTKKBBUHG. AND OK TUB 
ACAOKMY t»K 8CIRNCK8 UK P II 1 1. A D K I.P II I A . AND OK TUB ROYAI. ACADEMY OF SCXKNCKS 
OK TURIN; KOKKIGN MKUDRft OK TIIR llOYAt. SOCIKTY OK 8C1KNCB8 OK 
gOtTI.NGKN, AND OK TIIR ItUYAI. BOIIKMIAN 80CIKTT UP 8CIRNCKS. AND 
OK TUB ACADEMY OK TUB MNCKl OP KOMR, AND OK TIIK AMKKICAN 
ACADRMY OK ARTS AND 8C1KNCK8 OP O0-«TON X A880CXATR OK TIIK 
ROYAI. ACADRMY OK OKI.GIUM: HONORARY MKMBER OF TIIK 
NKW YORK ACADRMY OF BCIKNCR8, AND OF TIIR 
CAMBHID6R P III I.OSO K II I C A I. BOCIRTV, AND OF 
TIIR ROYAI. PIIY8ICAI. 80CIRTT OF BOIN* 
BURGH, AND OF TUB 
BIUI.OGICAI. BOCIKTY OF PARIH, AND OF TIIR CAI.IFORNIA ACADBMY OF 8CIRNCRS OF SAN KKANCISCO. AND 
OF TUK ROYAL ZOOLOGICAL AND MALAC0L06ICAL SOCIETY OF BELGIUM; 
CORRESPONDING MKMBER OF TIIR SKNKRNBBKG ACADRMY OF F U A N K FU RT' A- M ; 
POHKION AS8UCXATK OF TIIK NATIONAL ACADRMY OK BCIBNCRS, U.8.. AND MEMBER OK TUB 
AMERICAN rillLOSUPHlCAL SOCXBTY y 
HONORARY FELI.QW OF TIIK ROYAL SOCIETY OF EDINBURGH; 
LATB UIMRCTOK OK THE NATl’KAl. IIISTOKY 1) R P A it TM K N Tt UK TIIK BRITISH MUSKUM : LATE PRKSIDRNT OK THE 
BUITlSIl ASSOCIATION FOR TIIK ADVANCEMENT OK 8CIKNCR; LATE KUM.KIIIAN PRUKKSSOH OK 
PH Y BIOLOGY IN THR IlOTAt. INSTITUTION OFGKRAT BRITAIN. 
LATR MNACHR PROFKSROU OK COMPAKATtVK ANATOMY AND KRI.LOW oK MERTON CO I.I.R G R , OX K O R l> ; 
RMXRITl'S PROFESSOR OK ZOOLOGY AND COMPAHATIVB ANATOMY IN UNIVERSITY COLLEGE. UNIVERSITY OF LONDON 
WITH TJIK CO-OPEUATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
FRLI.OW OK TRINITY COLLEGE, CAMBRIDGE, AND PROFESSOR OF ZOOLOGY IN THE I M P E R I A L COL LEGE OF 
SCIENCE AND TECHNOLOGY, LONDON; 
SYDNE7 J. HICKSON, M.A., F.R.S., 
BKYRR KKUKKSSOR OK ZOOLOGY IN THR UNIVERSITY OK .M A N C H K NT l< H i 
E. A. MINCHIN, M.A., F.R.S., 
PROFESSOR OK PB01 UZUOl.OGY IN THE UNIVERSITY OK LONDON; 
AND 
GILBERT C. BOURNE, M.A., D.Sc., F.R.S., 
MNaCRR PROKRSSOR ok rOMPARATIVR ANATOMY«AND PRLLOIV OK MERTON COLLEGE, OXKORD. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
L O N D O N . 
J. & A. CHURCHILL, 7 GREAT MARLBOROUGH STREET. 
1912. 
Adlard and Son, Impr.,] 
[London and Dorking. 
