^ ma 



New Series, No. 178 (Vol. 45, Part 2). Price 10s. 



NOVEMBER, 1901. 

 THE 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



EUITEU BY 



E. KAY LANKESTER, M.A., LL.D., F.R.S., 



HONORARY FELLOW OF EXETER COLLEGE , OXFORD ; CORRESPONDENT OF THE INSTITUTE OF FRANCE 



AND OF THE IMPERIAL ACADEMY OF SCIKNCES OP ST. PETERSBURG, AND OF THE ACADEMY 



OF SCIENCES OF PMILAMELPIII A ; FOREIGN MEMBl^R OF THE ROYAL BOHEMIAN 



SOCIETY OF SCIENCES, AND OF THE ACADEMY OF THE LINCKI OF ROME; 



ASSOCIATE OF THE ROYAL ACADEMY OF BELGIUM ; HONORARY MEMBER 



OF THE NEW YORK ACADEMY OF SCIENCES, AND OF THE 



CAMBRIDGE PHILOSOPHICAL SOCIETY, AS D OF THE ROYAL 



PHYSICAL SOCIETY OF EDINBURGH ; HONORARY 



MEMBER OF THE BIOLOGICAL SOCIETY 



OF PARIs; 



DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS OF THE BRITISH MUSEUM; LATE PULLERIAN 



PROFESSOR OF PHYSIOLOGY IN THE ROYAL I NSTITU flON OF GB EAT BR »TA1N. 



WITH THE CO-OPEIIATION OF 



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



KF,I,I,OW AND TUTOR OF TRINITY COLLEGE, CAtlBRIDGE; 



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



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



SEVER TROIESSOR Ol ZOOLOGY IX THE OWENS COLLEGE, M A XCIl ESTI. K . 



WITH LITHOGRAPHIC PLATES AND ENGRAVINGS ON WOOD. 



LONDON : 



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



1901. 



Adlard and Son,] 



[Bartholomew Clnae. 



