QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
EDITED BY 
H. RAY LANKESTER, M.A., LL.D., F.RB.S., 
HONORARY FELLOW OF EXETER COLLEGE, OXFORD 3 CORRESPONDENT OF THE INSTITUTE OF FRANCK 
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 BOWEMIAN SOCIRTY OF SCIENCES, AND 
OF THE ACADEMY OF THE LINCEI OF ROME, 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 ; HONORARY MEMBER OF THE 
BIOLOGICAL SOCIETY OF PARIS; 
FOREIGN ASSOCIATE OF THE NATIONAL ACADEMY OF SCIENCES, U.S., AND MEMBER OF 
THE AMERICAN PHILOSOPHICAL SOCIETY 3 
DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS OF THE BRITISH MUSEUM; LATE FULLERIAN 
PROFESSOR OF PHYSIOLOGY IN THE 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. 
FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE} 
W. F. R. WELDON, M.A., F.B.S., 
LINACRE PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGE, OXFORD; 
LATE FELLOW OF ST. JOHN’S COLLEGE, CAMBRIDGE, 
AND 
SYDNEY J. HICKSON, M.A., F.RS., 
BEYER PROFESSOR OF ZOOLOGY IN THE OWENS COLLEGE, MANCHESTER. 
VOLUME 49.—New Sertzgs. 
With Rithographic Plates and Text- Figures. 
4 LONDON: 
J. & A. CHURCHILL, 7, GREAT MARLBOROUGH STREET. 
1906. 
