7 s-z 7 
New Series, No. 245 (Vol. 62, Part 1). Price 10s. 6d. net* 
Subscription per volume (of 4 parts) 42s. net. 
NOVEMBER, 1916. 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
Sir RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
HONORARY FBI. LOW OF RXBTKK CO LI. KG K AND HONORARY STUDENT OF CHRIST CHURCH, OXFORD; 
MEMBER OF THE INSTITUTE OF FRANCK (ASSOClfc ETRANGER DE J.'aCADEMIE DES SCIENCES); 
CORRESPONDENT OF THE IMPERIAL ACADEMY OF SCIENCES OF 8T. PETERSBURG, AND OF TUB 
ACADEMY OP 8CIKNCKS OF P HILADK LP II I A, AND OF THE ROYAL ACADEMY OF SCIENCES 
OF TURIN; FOREIGN MEMBER OF THE ROYAL SOCIETY OF 8CIENCBS OF 
GOTTINGEN, AND OF THE ROYAL BOHEMIAN SOCIETY OF SCIENCES, AND 
OF THE ACADEMY OF THE J.INCEI OF ROME, AND OF THE AMERICAN 
ACADEMY OF ARTS AND SCIENCES OF BOSTON ; ASSOCIATE OK THE 
R O Y Al< ACADEMY OF BELGIUM; HONORARY MEMBER OP THE 
NEW YORK ACADEMY OF 8CIKNCK8, AND OF THE 
CAMBRIDGE PHILOSOPHICAL 80CIKTY, AND OF 
THE ROYAL PHYSICAL SOCIETY OF EDIN- 
BURGH, AND OF THE 
BIOLOGICAL AND ZOOLOGICAL SOCIETIES OF PARIS, AND OF THE CALIFORNIA ACADEMY OF SCIENCES OF 
SAN FRANCISCO, aN|i OF THE ROYAL ZOOLOGICAL AND M AL ACOLOGIC AL SOCIETY OF BELGIUM; 
CORRESPONDING MEMBER OF THE SKNKENBERG ACADEMY OF FRAN KFURT A-M J 
FOREIGN ASSOCIATE OF THE NATIONAL ACADEMY OF SCIENCES. U.S., AND MEMBER OF THE 
AMERICAN PHILOSOPHICAL SOCIETY ; 
HONORARY FELLOW OF THE ROYAL SOCIETY OF EDINBURGH; 
LATE DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS OF THE BRITISH MUSEUM; LATE PRESIDENT OF THE 
BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE; LATE FULLKRIAN PROFESSOR OF 
PHYSIOLOGY IN THE ROYAL INSTITUTION OF GREAT BRITAIN i 
LATE T.INACRK PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGE , OXFOR D ; 
EMERITUS PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN UNIVERSITY COLLEGE, UNIVER8ITY OF LONDON 
WITH Till? CO-OPElt ATION OF 
SYDNEY J. I-IICKSON, M.A., F.R.S., 
BEYER PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF MANCHESTER; 
GILBERT C. BOURNE, M.A., D.Sc., E.R.S., 
ACRE PROFESSOR OF COMPARATIVE ANATOMY, AND FELLOW OF MERTON COLLEGE, OXFOR 
J. GRAHAM KERR, M.A., E.R.S., 
REGIUS PROFESSOR OF ZOOLOGY IN Tills UNIVERSITY OF GLASGOW; 
AND 
E. W. MACBRIDE, M.A., D.Sc., LL.D., F.R.S., 
PROFESSOR OF ZOOLOGY AT THE IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY. 
WITH LITHOGRAPHIC PLATES AND TEXT-PIGURES. 
J. & A. CHURCHILL 
Adlard & Son and West Newman.,] 
LONDON. 
7 GREAT MARLBOROUGH STREET. 
1916. 
[London and Dorking. 
