QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



EDITED BY 



Sir ray LANKESTER, K.C.B., M.A., D.Sc, LL.D., F.R.S., 



FELLOW OF EXKTKIt C O L LE G E . OX FO n 1) ; 

 OF THE IMPERIAL ACAIUCMY OF SCIENCES ( 

 OF SCIENCES OF PHILADELPHIA, AND OF 



OK Turin; foreign member of thi 



:ORRF.SPONDBNT OF TUE INSTITUTE OF 



P ST. PETERSBURG, AND OF THE ACADE 



THE ROYAL ACADEMY OF SCIENCES 



ROYAL SOCIETY OF SCIENCES OF 



GOTTINGEN, AND OF THE ROYAL BOHEMIAN SOCIETY "F SCIENCES, AND 

 OF THE ACADEMY OF THE LINCEI OF ROME, AND OF THR 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 THR 

 CAMBRIDGE PHILOSOPHICAL SOCIETY, AND OF 

 THE ROYAL PHYSICAL SOCIETY OF EDIN- 

 BURGH, AND OF THE 

 BIOLOGICAL SOCIKTY OF PARIS, AND OF THE CALIFORNIA ACADEMY OF SCIENCES OF SAN FRANCISCO', 

 OF THE ROYAL ZOOLOGICAL AND M ALACOLOGIC A L SOCIETY OF BELGIUM; 

 CORRESPONDING MEMBER OF THE SENKENBERG ACADEMY OF FR AN KFURT-A'M ; 

 FOREIGN ASSOCIATE OF THE NATIONAL ACADEMY OF SCIENCES, U.S., AND MEMBER OF THE 

 AMERICAN PHILOSOPHICAL SOCIETY ; 

 RKCTOKOF THE NATURAL HISTORY DEPARTMENTS OF T El K BRITISH MUSEUM; LATE PRESIDENT "F THE 

 ASSOCIATION FOR THE ADVANCEMENT OF SCIENCF.* LATK FULLKRIAN PROFESSOR OF 

 PHYSIOLOGY IN THK ROYAL INSTITUTION OF GREAT BRITAIN ; 

 LATK LINACRE PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGE, OXFOR] 



WITH THE CO-OPEUATION OF 



ADAM SEDGWICK, M.A., F.R.S., 



PUOFESSOR OF ZOOLOGY AM) COMrMlATIVE ANATOMY IN TUE UNIVERSITY OF CAMnRinGK; 



SYDNEY J. HICKSON, M.A., F.R.S, 



BKYER PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF MANCHKSTKK; 

 AND 



E. A. MINCHIN, M.A., 



PROFESSOR OF PROTOZOOLOGY IN TUE UNIVERSITY OF LONDON. 



VOLUME 51.— New Series. 

 Mh\i fitl^ograp^ix f httes anb fa-l-Jfiguws 



LONDON: 

 J. & A. CHURCHILL, 7, GREAT MARLBOROUGH STREET. 



1907. 



