QUARTERLY JOURNAL 



MICROSCOPICAL SCIENCE. 



EDITED BY 



E. RAY LANKESTER, M.A., LL.D., F.R.S., "^ 



OSORARY FELLOW or EXETER COLLEGE, OXFOR D ; COB R ES POM nEN T OF THE INSTITUTE OF FRANCE 

 ANK OF THE IMPERIAL ACADEMY OF SCIENCES OP ST. PETERSBURG, AND OF THE ACADEMY 

 OF SCIENCES OF PHILADELPHIA; FOREIGN MEMBBB OF THE ROYAL SOCIETY OF 

 SCIENCES OF GOTTINGEN AND OF THE RO YAL BOHEMIA N SOCIETY OF SCIENCES, 

 AND OF THE ACADEMY OF THE LINCEI OF ROME, AND OF TUR AMERICAN 

 ACADEMY OF ARTS AND SCIENCES OF BOSTON J 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 ", 

 niRKCTOB OF THE NATURAL HISTORY DEPARTMENTS OF THE BRITISH MUSEUM; LATE FULLERIAN 

 PBOFESSOB OF PHYSIOLOGY IN THE ROYAL INSTITUTION OF GREAT BRITAIN ! 

 LATE MNACRE PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW "F MEBTOX COLLEGE, OXFORD. 



WITH THE CO-OPEKATION OF 



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



FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE; 



W. F. R. WELDON, M.A., F.R.S., 



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



BEYER PROFESSOR OF ZOOLOGY IN THE OWENS COLLEGE, MANCHESTER. 



VOLUME 47.— New Series. 

 iUt^ ITitljogrHpIjit ^Intes anb ^ngrafiings on SJloob, 





LONDON: 

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



1904. 



J^ 



