QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
Sir RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., P.R.S., 
VOLUME 62.— New Series. 
IIONOIUUY FBI, LOW OK KXETKK COLLBGK AND HONORARY STUDENT OF CHRIST CHURCH, OXFORD; 
MEMBER OF THE INSTITUTE OF FRANCK (ASSOCIE ETIIANGER DE l’aCADEMIE DES SCIENCES) y 
CORRKSPONDKNT OF THE IMPERIAL ACADEMY OF SCIENCES OK 8T. PETERSBURG, AND OF THE 
ACADEMY OF 8CIENCES OF PHILADELPHIA, AND OF THE ROYAL ACADEMY OF SCIENCES 
OK TURIN; FOREIGN MEMBER OF THE ROYAL SOCIETY OF SCIENCES OF 
GOTTINGEN, AND OF THE ROYAL BOHEMIAN SOCIETY OF SCIENCES, AND 
OF THE ACADEMY OF THE LINCEI OF ROME, AND OF THE AMERICAN 
ACADEMY OF ARTS AND SCIENCES OF BOSTON ; ASSOCIATE OF T1IR 
ROYAL ACADEMY OF BELGIUM; HONORARY MEMBER <>F THE 
NEW YORK ACADEMY OF SCIENCES, AND OF THE 
CAMBRIDGE PHILOSOPHICAL SOCIETY, AND OF 
THE ROYAL PHYSICAL SOCIETY OF EDIN- 
BURGH, AND OF THE 
BIOLOGICAL AND ZOOLOGICAL SOCIETIES OK PARIS, AND OF THE CALIFORNIA ACADEMY OF 8CIKNCKS OF 
SAN FRANCISCO, AND OF THE ROYAL ZOOLOGICAL AND MALACOLOGIC AL SOCIETY OK BELGIUM; 
CORRESPONDING MEMBER OF THE 8ENKENBERG ACADEMY OF FR AN KFURT AM J 
FOREIGN ASSOCIATE OF THE NATIONAL ACADEMY OF SCIENCES, U.S., AND MEMBER OK THE 
AMERICAN PHILOSOPHICAL SOCIETY ; 
HONORARY FELLOW OF THE ROYAL SOCIETY OF EDINBURGH*, 
LATE DIRECT O K OK THE NATURAL HISTORY DEPARTMENTS OF THE B R IT 1 8 II MUSEUM; LATE PRESIDENT OF TUB 
BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE,* LATE FULLKRIAN PROFESSOR OK 
P II Y8IOLOG Y IN THE ROYAL INSTITUTION OF GREAT BRITAIN i 
LATE LINACKK PR0FES80R OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLRGB, OXFORD; 
EMERITUS PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN UNIVERSITY COLLEGE, UNIVERSITY OF LONDON 
LINACRE PROFESSOR OF COMPARATIVE ANATOMY, AND FELLOW OF MERTON COLLEGE, OXFORD 
EDITED BY 
WITH THE CO -OPERATION OF 
SYDNEY J. HICKSON, M.A., F.R.S., 
BEYER PROFESSOR OK ZOOLOGY IN THE UNIVERSITY OF MANCHESTER; 
REGIUS PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF GLASGOW; 
AND 
PROFESSOR OK ZOOLOGY AT THE IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY. 
plates awb fat-Jfigures, 
LONDON: 
GREAT MARLBOROUGH STREET. 
1917. 
J. & A. CHURCHILL 
