ak 4 eal & 
7 2 
New Series, No. 211 (Vol. 53, Part 3). Price 10s. net. 
Subscription per volume (of 4 parts) 40s. net. | 
MAY, 1909. | 
THE 
| QUARTERLY JOURNAL 
OF 
“MICROSCOPICAL SCIENCE. 
EDITED KY 
Sm RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., | 
MONOBKABY FELLOW OF EXETER COLLEGE, OXFORD; CURRESPONDENT OF THE INSTITUTE OF ¥RANCE, | 
AND OF THE IMPERIAL ACADEMY OF SCIENCES OF ST- PETERSBURG, AND OF THE ACADEMY 
OF SCIENCES OF PHILADELPHIA, AND OF THE ROYAL ACADEMY OF SCIENCES 
OF TURIN; FOREIGN MEMBER OF THE ROYAL SOCIETY OF SCIENCES OF 
GOTTINGEN, AND OF THE ROYAL BOUEMIAN SOCIETY OF SCIENCES, AND 
OF THK ACADEMY OF THE LINCEI OF KOME, AND OF THR AMERICAN 
ACADEMY OF ARTS AND SCIENCES OF BOSTON ¢ ASSOCIATE OF THE 
ROYAL ACADEMY OF BELGIUM: HONORARY MEMBER ©OF 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 SOCIETY OF PARIS; AND OF THR CALIFORNIA ACADEMY OF SCIENCES OF SAN FRANCISCO, AND 
| OF THE ROYAL ZOOLOGICAL AND MALACOLOGICAL SOCIETY OF BELGIUM; 
CORRESPONDING MEMBER OF THE SENKENBERG ACADEMY OF FRANKFURT‘A-M; 
FOREIGN ASSOCIATE OF THE NATIONAL ACADEMY OF SCIENCES, U-S-» AND MEMBER OF THE 
AMERICAN PHILOSOPHICAL SOCIETY 5 
HONORARY FELLOW OF THE ROYAL SOCIETY OF EDINBURGH; 
LATE DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS OF THE BRITISH MUSEUM, LATE PRESIDENT “¥ THE 
BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE: LATE FULLERIAN PROFRKSSOR OF 
PHYSIOLOGY IN THER ROYAL INSTITUTION OF GREAT BRITAIN; 
LATE LINACRE PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGE, OXFORD. 
WITH THE CO-OPERATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN THE UNIVERSITY OF CAMBRIDGE 
SYDNEY J. HICKSON, M.A., F.R.S., 
BEYER PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF MANCHESTER 
AND 
E. A. MINCHIN, M.A., 
PROFESSOR OF PROTOZOOLOGY IN THE UNIVERSITY OF LONDON. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
EON DOR . 
J. & A. CHURCHILL, 7 GREAT MARLBOROUGH STREET. 
1909. 
EEE EEE 
Adlard and Son, Impr.,] {London and Dorking. 
