u 



QUAIITERLY JOURNAL 



MICKOSCOPICAL SCIENCE. 



EDITED BY 



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



HO'ltlKAKY FEI.I.flW 'If K.XKTKK C O I.I.R G K . O X K () U I> ; 



MEM BE II OF TUK l:<»TlTinK OK f KANCK (ASSorif. ICTRAXGEB I>E 1,'aCADEMIE DES SCIENCES) ; 



Ct»KKKaFij;SDB.NT OF THK IMPKKIAI, ACaUKMV OK SCIKNCES OP ST- PKTHUSBtJKG, AND OK THE 



ACADKMY 'IF 8CIKNCKS OF P HI I. A D K I. P ir I A , AND OF THE KOVAI. ACADEMY OF SCIKNCE3 



OF TUKIn; FOKKIGN MEMBBR op tub KOYAI. society OF SCIENCES OP 



GOTTINGEN, AND OF THE K O Y A I. BOHEMIAN SOCIF.TY "F SCIENCES, AND 



OP THE ACADEMY OF THE I.INCEI OF HOME, AMD OP THE AMKBICAN 



ACADEMY OP AKTS AND SCIENCES OF BO'<TON '. ASSOCIATE OF THK 



ROYAI. ACADEMY OF BELGIUM; UONnKARY MEMSRR "P THE 



NEW Y O K K ACADEMY OF S C I P. N C K S , AND OP THE 



CAMBKIDGK PHILOSOPHICAL SOCIETY, AND OP 



TUB KOYAI. PIfYRICAI. SOCIETY OF EDIN" 



Bt'ltGH, AND OF THE 



BIOI.UGirAl. SOCIETY OF PAKIS. AND OP THE CAMFOKNIA ACADE5IY OF SCIENCES OP SAN PKANCI3CO, AMD 



»)F THK KOYAI. ZOOLOGICAL AND M ALACOLOGIC A 1. SOCIETY OF BELGIUM; 



CORRESPONDING MEMBER OF THE 8ENKENBERG ACADEMY OP FB AN K FU RT'A-M ; 



POKFIGN ASSOCIATE OP THK NATIONAL ACADEMY OP SCIENCES. U.S.. AND MEMBER OP THE 



HONORARY FELLOW i*V THE ROYAL SOCIETY OF EDINBURGH; 



LATE IUHKfTOR OK THE NATURAL HISTORY DEPARTMENT! OK THE BRITISH MlftKII.M; LATE PRESIDENT OF THE 



BRITISH \SSOCIATION FOR THE ADVANCEMENT OF SCIENCK.' LATE K I' L I. K H I A ?» PKOKR880R OF 



PHYSIODIGY IN Til H ROYAL I N STITITT I O N O F GK K AT B R IT A I N 1 



LATR LINACRK PROFESSOR OF TOMPARATIVF ANATOMY AND FELLOW OF MERTON C OLLF G E . fiXPO B D ; 



EMERITI S PROFESSOR OF ZOOLOGY A N D COMP AR ATI VF. ANATOMY IN UNIVERSITY COLLEGE. CMVEKSITYOF LONDO"- 



WITU TKK CO-OPFUATION OF 



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



FELLOW OF TRINITY ( OLLEGK, TAMBRIDGE. AND PROFESSOR t)F ZOOLOGY IN THE IMPERIAL COLLEGE OP 

 SCIENCE ANn TECHNOLOGY, LONDON; 



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

 """k'T." MIXCHIn/ M.Ti F.R.S., 



PROFESSOR OF PROT OZOf)LOGY IN THE IMVERSITY OK LONDON; 

 AND 



GILBERT C. BOURXE, M.A., D.Sc, F.R.S., 



I.IV»CRF rilllFKSSIil; OF COMPAIHTIVR ANATOMY, A M> PKI.I.OW "V MERTON (OI.I.KGK, OXFOKIl. 



VOLUME 56.— New Series. 

 cQlilb lltbograpliic plates anb £;evt-#tciuus. 



LONDON: 

 J k A.. CHURCHILL, 7, GREAT MARLBOROUGtl STREET. 



19] L 



