﻿QUARTERLY 
  JOURNAL 
  

  

  MICROSCOPICAL 
  SCIENCE. 
  

  

  EUITKD 
  BY 
  

  

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

  

  Y 
  FKI.I.OW 
  OF 
  EXKTKU 
  C 
  OI.I.KG 
  E 
  , 
  OXKO 
  II 
  D 
  ; 
  C 
  OR 
  B 
  R3 
  Pl> 
  \ 
  U 
  It 
  N 
  T 
  OK 
  T 
  II 
  K 
  INSTITUTK 
  O 
  1' 
  FUANfl 
  

   n> 
  OK 
  TUB 
  IMPKRIAI. 
  ACAUKMY 
  OK 
  SCIKXCES 
  OK 
  ST- 
  P 
  KT 
  K 
  U 
  S 
  B 
  II 
  II 
  G 
  , 
  AND 
  OF 
  THE 
  ACAUKMV 
  

   OK 
  SCIENCES 
  OF 
  P 
  II 
  I 
  I.A 
  1) 
  E 
  I,P 
  III 
  A 
  ; 
  KOUIUGN 
  .MEMBKR 
  OK 
  THE 
  UOYAI. 
  SOCIETY 
  OF 
  

   sriEXCKS 
  OF 
  GOTTINGEX 
  AXD 
  OF 
  THE 
  U 
  O 
  Y 
  A 
  I. 
  1) 
  O 
  M 
  K 
  M 
  I 
  A 
  X 
  SOCIETY 
  OKSCIKXCKS, 
  

   AND 
  OK 
  THE 
  ACADEMY 
  OK 
  THE 
  MXCEI 
  OK 
  ROME, 
  AND 
  OK 
  TIIK 
  AMERICAN 
  

   ACADEMY 
  OF 
  ARTS 
  AXD 
  SCIENCES 
  OK 
  BOSTON 
  X 
  ASSOCIATE 
  OF 
  THE 
  

   ROYAL 
  ACADEMY 
  OP 
  BELGIUM; 
  HOXURARY 
  MEMBER 
  oF 
  THE 
  

   NEW 
  YORK 
  ACADEMY 
  OK 
  SCIKXCES, 
  AXD 
  OF 
  THE 
  

   CAMBRIDGE 
  F 
  H 
  ILU 
  S 
  O 
  P 
  H 
  IC 
  AT. 
  SOCIETY, 
  AXD 
  OK 
  

   THE 
  ROYAI. 
  PHYSICAL 
  SOCIETY 
  OK 
  EDIN- 
  

   BURGH 
  ; 
  HONORARY 
  MEMBER 
  OP 
  THE 
  

   BIOLOGICAL 
  SOCIETY 
  OF 
  PARIS; 
  

   FORKIGN 
  ASSOCIATE 
  OF 
  THE 
  NATIONAL 
  ACADEMY 
  OF 
  SCIENCES, 
  U.S., 
  AND 
  MEMBER 
  OF 
  

   THE 
  AMERICAN 
  PHILOSOPHICAL 
  SOCIETY 
  ; 
  

   TOR 
  OK 
  THE 
  NATURAL 
  HISTORY 
  D 
  EP 
  A 
  IIT 
  AI 
  E 
  N 
  TS 
  OF 
  THE 
  DRiriSIl 
  MUSEUM; 
  LATE 
  KULI.KItlAN 
  

  

  PHOKKSSOK 
  OK 
  PHYSIOLOGY 
  IN 
  THE 
  ROYAL 
  INSTITUTION 
  OF 
  GREAT 
  IIRITAIX 
  ; 
  

   [NACRE 
  PROFESSOR 
  OF 
  COMPARATIVE 
  ANATOMY 
  AND 
  FELLOW 
  OF 
  MERTON 
  COLLEGE, 
  OXFORD. 
  

  

  WITH 
  THE 
  CO-OPEUATION 
  OF 
  

  

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

  

  KELI.OW 
  AND 
  TUTOR 
  OF 
  TRINITY 
  COLLEGE, 
  CAMBRIDGE; 
  

  

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

  

  SSSOB 
  OF 
  COMPARATIVE 
  ANATOMY 
  AXD 
  FELLOW 
  OK 
  MERTON 
  CO 
  

   LATE 
  TELLOW 
  OK 
  ST. 
  JOHN's 
  COLLF.GK, 
  CAMBRIDGE; 
  

  

  AND 
  

  

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

  

  BEYER 
  PROFESSOR 
  OK 
  ZOOLOGY 
  IN 
  THE 
  UWENS 
  COLLEGE, 
  .MANCHESTER. 
  

  

  VOLUME 
  48.— 
  Nkw 
  Series. 
  

   )litb 
  ^''itbograpbic 
  |HHfcs 
  nub 
  €ngrabings 
  on 
  oxiloob. 
  

  

  "- 
  LONDON: 
  

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

  

  1905. 
  

  

  