New Series, No. 225 (Vol. 57, Part 1). Price 10s. net. 
Subscription per volume (of 4 parts) 40s. net. 
AUGUST, 1911. 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
EDITED BY 
Sir RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
HONORARY FBI.I.OW OF EXETER COLLEGE, OXFORD ; 
MEMBER OF THE INSTITUTE OF FRANCE (ASSOCl£ STRANGER DE I/’aCADEMIE DES SCIENCES) ; 
CORRESPONDENT OF THE IMPKRIAI. ACADEMY OF SCIENCES OF 8 T. PETERSBURG, AND OF THE 
ACAD K 31 Y OF SCIENCES OF P H 1 1. A D R I, F II I A , AND OF THE ROYAI, ACADEMY OF SCIENCES 
OF TURIN; FOREIGN MEMBRR OF THE ROYAL SOCIETY OF SCIENCES OF 
G&TTINGEN, AND OF THE ROYAI. BOHEMIAN SOCIETY OF SCIENCES, AND 
OF THE ACADEMY OF THE LINCEI OF ROME, AND OF TIIR AMERICAN 
ACADEMY OF ARTS AND SCIENCES OF BOSTON ; ASSOCIATE OF THE 
ROYAI. ACADEMY OF BELGIUM! HONORARY MEMBER OF THE 
NEW YORK ACADEMY OF SCIENCES, AND OF THE 
CAMBRIDGE PHILOSOPHICAL SOCIETY, AND OP 
THE ROYAL PHYSICAL SOCIETY OF EDIN- 
BURGH, AND OF THE 
BIOLOGICAL SOCIETY OF PARIS, AND OF THE CALIFORNIA ACADEMY OF SCIENCES OF SAN FRANCISCO, AND 
OF THE ROYAL ZOOLOGICAL AND MALACOI.OGICAL SOCIETY OF BELGIUM; 
CORRESPONDING MEMBER OF THE SENKENBERG ACADEMY OF FR AN 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 THB 
BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE,* LATE FUI.LKRI AN PROFESSOR OF 
PHYSIOLOGY IN THE ROYAL INSTITUTION OF GREAT BRITAIN ! 
LATE I, I NACRE PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGE, OXFORD, 
EMERITUS PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN UNIVERSITY COLLEGE, UNIVERSITY OF LONDON. 
WITH THE CO-OPERATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
FELLOW OF TRINITY COLLEGE, CAMBRIDGE. AND PROFESSOR OF ZOOLOGY IN THE IMPERIAL COLLEGE OP 
SCIENCE AND TECHNOLOGY, LONDON; 
SYDNEY J. HICKSON, M.A., F.R.S., 
BEYER PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF MANCHESTER; 
E. A. MINCHIN, M.A., F.R.S., 
PROFESSOR OF PROTOZOOLOGY IN THE UNIVERSITY OK LONDON; 
AND 
GILBERT C. BOURNE, M.A., D.Sc., F.R.S., 
[.INACRE PROFESSOR OF COMPARATIVE ANATOMY, AND FELLOW OF MERTON C 61 .LEGR, OXFORD. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
J. A A. CHURCHILL 
LONDON. 
7 GREAT MARLBOROUGH STREET. 
1911. 
Adlard and Son, Impr.,] 
[London and Dorking , 
