/ 



QUARTERLY JOURNAL 



MICROSCOPICAL SCIENCE. 



KDITED BY 



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



HONOUARY FEM-OW OF EXETER COLLEGE , OXFORD ; COR R KSPONDKN T OF THE INSTITITK OF 



AND OF THE IMPERIAI, ArADEMV OF SCIENCES OP ST. PETERSBURG, AND OF THE ACADEM 



OF SCIENCES OF Pll lI.ADEI.rUI A ; FOREIGN MKMBKR OF TllK KOYAI. BOUE.MIAN 



SOCIETY OF SCIENCES. AND OF THE ACADEMY OF THE MNCEI OF ROME J 



AND OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES OF BOSTON 



ASSOCIATE OF THE ROYAI. ACADEMY OF BEI.GIIM i HONORARY MEMBER 



nF THE NEW YORK ACADEMY OF SCIENCES, AND OF THE 



CAMBRIDGE PHILOSOPHICAL SOCIETY, AND OF THE BOYAL 



PHYSICAL SOCIETY OF EDIXBirRGH ; HONORARY 



MEMBER OF THE BIOLOGICAL SOCIETY 



OP PARIS; 



DIRECTOR OF THE NATIfRAL HISTORY DEPARTMENTS OF THE BRITISH MTSElIMi LATE Ft'LLI 



rKOFK»SOR OF PHYSIOLOGY IN THE ROYAI. INSTITUTION OF GREAT BRITAIN. 



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., 



BFYKH PROFKSSOB OF ZOOI.CIGt IX fllK OWENS COM.EGR, MAMCU RSTKK. 



VOLUME 45.— Nkw Series. 

 S^Ufl) ^itl^ograpljit ^IhIcs nnb (fnigrabings on S^loob. 



LONDON: 

 J. & A. CHURCHIJ.L, 7, GREAT MARLBOROUGH STREET. 



^1902. 



