New Series, No. 213 (Vol. 54, Part 1). Price lOs. net. 
Subscription per volume (of 4 parts) 40s. net. 
SEPTEMBEE, 1909. 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
EDITKI) HY 
SiE RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
HO:«OKAKY YBLLOW OK KXBTBK C O M. RG B , O X I* O H ; C UR K KS P UX O B .N T OK TUB IXSTITUTK UK KRANCE, 
AMD OK TUB laiPKRIAI. ACADEMY OK SCIKXCKS OP ST. PXTKKSBUKG, AXD OK TUB ACADEMY 
OK SCIBXCK8 OK P U 1 L A DK I. P U I A , AXD OK TUB ROYAL ACADEMY OK SCIRXCES 
OK tURiX; KORBIGX MKMBBR OK TUB ROYAL SOCIETY OK SCIENCES UK 
gOtTIXGBX, AXD OK TUB HuYAI. BOIIBMIAN SOCIKTY OK 3C1BXCE8, AMD 
OK TUB ACADKMY OF TUB I.IXCEI OK ROMK, AXD OK TUB AMERICAN 
ACADEMY OK ARTS AND SCIENCRS OK BOSTON*. ASSOCIATE OK TIIR 
ROTAl. ACADKMY UK BELGIUM. HONORARY MEMBER OK THE 
NBW YORK ACADRSIY OK 8CIKNCES, AND OK TUB 
CAMDKIDGK P II 1 1.08 U P 11 tC A L SOCIETY, AND OK 
TUB ROYAL PHYSICAL SOCIETY OK BOIN* 
BURGli, AND OK TUE 
BIOLOGICAL SUCIKTT OK PARIS, AND OK TUB CALIKORNIA ACADEMY OP SCIENCES OK SAN KRANCISCO, AND 
OK THE ROYAL ZOOLOGICAL AND MALACOLOGICAL SOCIETY UK BBLGIU.M; 
CORRESPONDING MB31BER OK THE 8ENKKNBERG ACADEMY OF PRANKKURT A'M ; 
FOREIGN ASSOClATK OK TUB NATIONAL ACADKMY OK SCIBNCES. U.S.. AND MRMRKR OK TUB 
AMERICAN rilll.OSOKIllCAL SOCIETY ; 
UONORARY FELLOW oK TUB ROYAL SOCIETY UK EDINBURGH; 
LATE UIKRCTOR OK TUB NATUUAI. HISTORY DBPAIITMKNTP OK THE BRITISH MUSEUM ; LATE PRESIDENT OP THE 
BK1T18I1 ASSOCIATION FOR TUB ADVANCEMENT OK SCIENCE; I.ATK KULt.KHIAN PKOKRS80R OK 
PHYSIOLOGY IN THK ROYAL INSTITUTION OK GRRAT BRITAIN; 
I.ATR I.INACRK PROFESSOR OK COMPARATIVK ANATOSIY AND FELLOW OK MERTON COMB G K , OX PO R D ; 
EMERITUS PROFESSOR OK ZOOLOGY AND COMPARATIVE ANATOMY IN UNIVERSITY COLI.EGE, UNIVERSITY OK LONDON. 
WITH THE CO-OPEKATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
PROPE8SOR OP ZOOLOGY AND COMPARATIVE ANATOMY IN TUE UNIVERSITY OK CAMIIRIDQK 
SYDNEY J. HICKSON, M.A., F.E.S., 
BEYER KKOKBSSOK OK ZOOLOGY IN TUP. UNIVERSITY O MANCIlESTKk; 
AND 
E. A. MINCHIN, M.A., 
PROFESSOR OK PROTOZOOLOGY l.N THE UNIVERSITY OK LONDON. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
LONDON. 
J. A A. CHUKCHILL, 7 GREAT MARLBOROUGH STREET. 
1909. 
.\dlard and Son, Impr.,] 
[London and Dorking. 
