New Series, No. 229 (Vol. 58, Part 1). Price 10s. net. 
Subscription per volume (of 4 parts) 40s. net. 
SEPTEMBER, 1912. 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
EDITKI) hV 
Sir ray LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
KOtOHAliY rKM.OW or EXBTKR CUl.t.KGK AND HONORARY STUDRNT OY CUKIST CHURCH, OXKUHD; 
MBMBEll UK TUK I.N8TITUTK UK KUANCR (aSSUCI^. ^TRANGBR DB 1,'ACADEMIB DBS SCIB.NCBs) i 
COKKKsrONDK.NT OK THK IMKKRIAI. ACADKftlY OK 8CIKNCKS OK 8T- FKTKRBBltUG, AND OK T II K 
ACADKMY OK 8CIK.NCK8 OK K M 1 1. A D K I. P II I A . AND OK THB ROYAI. ACADK.MY UK SCIRNCES 
OK TURIN; KOHKIGN .MBMORH OK TUB ROYAI. SOCIBTY OK 8CIKNCBS OK 
cOTTINGKN, AND OK THK UOYAI. BOIIR.MIAN BOCIKTY UK BCIKNCKS. AND 
OK THR ACADEMY OK TIiR MNCKI OK llOMR, AND OK THK A.MKIUCAN 
ACADEMY OK ARTS AND 8CIKNCK8 OK OOnTUN ; ABSOClATK OK THR 
ROYAI. ACADKMY OK BKI.GttlM; HONORARY MEMBER OK THK 
NKW YORK ACADKMY OK BCIKNCKS, AND OK TMK 
CAMBIilDGR PIIII.OSOPIIICAI. BOCIKTY. AND OK 
1MK ROYAI. PIIYSICAI. BOCIKTY OK BDIN* 
BURGH, AND OK THE 
BIOl-OeiCAI. SOCIKTT OK PARIB, AND OK TUK CAt.IKOflNTA ACADKMY OK SCIKNCE8 OK SAN KHANCtSCO, AND 
OK THK KOTAI. E00I.06ICAI. AND M AI. ACOl.O GIC A 1. BOCIKTY OK RKI.GIUM; 
CURRKsroNDlNG MKMRKR OK TIIR 8HNKRNBRRG ACADKMY OK KK A N K KU K T- A* M ; 
KUKKIGN A880C1ATR UK THK NATIUNAI. ACADKMY OK 8CIKNCRS, U-8.. AND MKMBKH UK THR 
AMRHiCAN ruit.osoritirAi. bocibty ; 
HONORARY PRt.I.OW UK THR RUTAI. SUCIETY UK EDINBURGH'. 
I.ATN niHKCTUIt OK TIIR NATUKAl. IIIBTURT DKKARTMKNT! UK THK BHlTlail MDSKtlM t.ATK PRKSIDKNT OK THK 
BRITISH A8SUCIATION KOR TIIK ADVANCKMRNT OK SCIKNCR; I.ATK KDI.I.KHIAN PU0KKS80K OK 
KIIY8IOI.OOY IN TMK UOYAl. INSTITUTION OF GKKAT BRITAIN . 
t.ATM I.INACKR KH(»KR880K OK COMPAKATIVK ANATOMY AND PKl.t.OW OK MKRTON C O M.K G B . O X KO H D ; 
KMKRITU8 PROKK8NOH OP ZOOLOGY A X D CO M P A B ATI VK ANATOMY IN U N I VK R SI T Y CO I. IKGK , U .N I V K U S| T Y OK LONDON 
WITH TIIR CO-OPKUATION OP 
ADAM SEDGWICK, M.A., F.R.S., 
KKI.I.OW OK TRINITY COLLEGE, CASIBRIDGR. AND mOKBSSOR OK ZOOLOGY IN TMK I M P K It 1 A I. COLLKGK OK 
SCIENCE AND T EC II N OI.OG Y , LONDON ; 
SYDNEY J. HICKSON, M.A., F.R.S., 
BRVRR KItOKKAAOK OK ZOOLOGY IN THK UNIVERSITY OP MANrilKATKK; 
E. A. MINCHIN, M.A., F.R.S., 
PROKKMSOR UK PROTOROOI.OGY IN THK UNIVERSITY OK LONDON; 
AND 
GILBERT C. BOURNE, M.A., D.Sc., F.R.S., 
LtNACRK PROKKSXOR OK COMPARATIVR ANATOSIV* AND KRI.I.OW OK MKRION COLLKGK, OXKOHD. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
LONDON. 
J. & A. CHURCHILL, 7 GREAT MARLBOROUGH STREET. 
1912. 
Adlard and Son, Impr.,] 
[London and Dorking, 
