iniuUiUsuH rauuui^uui \^ 



QUARTERLY JOURNAL 



MICROSCOPICAL SCIENCE. 



EDITED BY 



B. RAY LANKESTER, M.A., LL.D., P.R.S., 



ilONORARV FRl.I.OW Ol' EXETER COM.EGE, OXFOUD ; COR R KSPON nENT OF THE INSTITUTE OF FRANCE 



AND OF THE IMPERIAL ACADEMY OF SCIENCES OF ST. PETERSBURG, AND OF THE ACADKMV 



OF SCIENCES OF PHILADELPHIA; FOREIGN MEMUKR OF THE ROVAI. BOHEMIAN 



SOCIETY OF SCIENCES, AND OF THE ACADEMY OF THE I.INCEI OF ROME, 



AND OF THH AMERICAN ACADEMY OF ARTS AND SCIENCES OF BOSTON ; 



ASSOCIATE OF THE ROYAI. ACADEMY OF BELGIUM; HONORARY MEMBER 



<1F THE NEW YORK ACADEMY OF SCIENCES, AND OF THE 



CAMBRIDGE PHIl.OSOPHICAI. SOCIETY, AND OF THE ROYAL 



PHYSICAL SttCIETY OF EDINBURGH ; HONORAR Y 



MEMBER OF THE BIOLOGICAL SOCIETY 



OF Paris; 



nlHECTOR nr the natural history departments of the BRITISH MUSEUM; LATE FULLERIAN 

 PROFESSOR OF PHYSIOLOGY IN THE ROYAL INSTITUTION OF GREAT BRITAIN. 



WITH THE CO-OPEUATION OF 



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



FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE; 



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



LINACKE PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGE, OXFORD; 

 LATE FELLOW OF ST. JOHN's COLLEGE, CAMBRIDGE; 



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



BEYER PROFESSOR OF ZOOLOGY IN THE OWENS COLLEGE, MANCHESTKK. 



VOLUME 46.— New Series. 

 3i5litlj Ififljogrnpljit |!lales anb (L-ncirRbings on 3!5loob. 



LONDON: 

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



1903. 



INVERTEBRATE ZOOLOGY 

 SMITHSOMIAM mSTiTUTiOAl 



