﻿TEEATISE 
  ON 
  ZOOLOGY 
  

  

  EDITED 
  BY 
  

  

  E. 
  

  

  KAY 
  LANKESTEK 
  

  

  M.A., 
  LL.D., 
  F.R.S. 
  

  

  HON. 
  FELLOW 
  liK 
  EXKTER 
  COLLEGE, 
  OXFORD; 
  DIRECTOR 
  OF 
  THE 
  NATURAL 
  HISTORY 
  DEPARTMENTS 
  

  

  OF 
  THE 
  BRITISH 
  MUSEUM 
  ; 
  FULLERIAN 
  PROFESSOR 
  OF 
  PHYSIOLOGY 
  AND 
  

  

  COMPARATIVE 
  ANATOMY 
  IN 
  THE 
  ROYAL 
  INSTITUTION 
  OF 
  LONDON 
  

  

  SCOPE 
  OF 
  THE 
  AVORK 
  

  

  THIS 
  comprehensive 
  ti-eatise 
  on 
  Zoology 
  has 
  been 
  for 
  some 
  time 
  in 
  prepara- 
  

   tion 
  under 
  the 
  editorship 
  of 
  Professor 
  Laukester. 
  Each 
  of 
  the 
  larger 
  

   groups 
  of 
  the 
  Animal 
  Kingdom 
  is 
  to 
  be 
  described 
  by 
  a 
  separate 
  author 
  ; 
  

   whilst, 
  as 
  far 
  as 
  possible, 
  uniformity 
  in 
  method 
  and 
  scope 
  of 
  treatment 
  are 
  

   aimed 
  at. 
  The 
  authors 
  are, 
  for 
  the 
  most 
  part, 
  graduates 
  of 
  the 
  University 
  of 
  

   Oxford, 
  though 
  it 
  may 
  not 
  be 
  possible 
  to 
  maintain 
  this 
  limitation 
  in 
  future 
  

   sections 
  of 
  the 
  work. 
  

  

  The 
  general 
  aim 
  of 
  the 
  treatise 
  is 
  to 
  give 
  a 
  systematic 
  exposition 
  of 
  the 
  

   cliaracters 
  of 
  the 
  classes 
  and 
  orders 
  of 
  the 
  Animal 
  Kingdom, 
  with 
  a 
  citation 
  

   in 
  due 
  place 
  of 
  the 
  families 
  and 
  chief 
  genera 
  included 
  in 
  the 
  groujis 
  discussed. 
  

   The 
  work 
  is 
  addressed 
  to 
  the 
  serious 
  student 
  of 
  Zoology. 
  To 
  a 
  large 
  extent 
  

   the 
  illustrations 
  are 
  original. 
  A 
  main 
  purpose 
  of 
  the 
  Editor 
  has 
  been 
  that 
  

   the 
  work 
  shall 
  be 
  an 
  independent 
  and 
  trustworthy 
  presentation, 
  by 
  means 
  of 
  

   the 
  systematic 
  survey 
  or 
  taxonomic 
  method, 
  of 
  the 
  main 
  facts 
  and 
  conclusions 
  

   of 
  Zoology, 
  or, 
  to 
  speak 
  more 
  precisely, 
  of 
  Animal 
  Morphography. 
  

  

  The 
  treatise 
  will 
  be 
  completed 
  in 
  ten 
  parts. 
  It 
  will 
  at 
  once 
  be 
  apparent 
  

   that 
  this 
  limitation 
  necessitates 
  brevity 
  in 
  treatment 
  which, 
  however, 
  will 
  

   not, 
  it 
  is 
  believed, 
  be 
  found 
  inconsistent 
  with 
  the 
  fulfilment 
  of 
  the 
  scope 
  pro- 
  

   posed, 
  or 
  with 
  the 
  utility 
  of 
  the 
  work 
  to 
  students. 
  

  

  The 
  parts 
  will 
  be 
  issued, 
  without 
  reference 
  to 
  logical 
  sequence, 
  as 
  soon 
  as 
  

   they 
  ai-e 
  ready 
  for 
  the 
  press. 
  

  

  The 
  following 
  authors 
  have 
  undertaken 
  portions 
  of 
  the 
  work 
  .• 
  — 
  Professor 
  

   Poulton, 
  F.R.S., 
  M.A.Oxon. 
  ; 
  Professor 
  Weldon, 
  F.R.S., 
  M.A.Oxon. 
  ; 
  Professor 
  

   Benham, 
  D.8c., 
  M.A.Oxon. 
  ; 
  Mr. 
  G. 
  C. 
  Bourne, 
  M.A.Oxon. 
  ; 
  Mr. 
  G. 
  H. 
  Fowler, 
  

   B.A.Oxon. 
  ; 
  Professor 
  Minchin, 
  M.A.Oxon. 
  ; 
  Mr. 
  F. 
  A. 
  Bather, 
  M.A.Oxon. 
  ; 
  

   Professor 
  J. 
  W. 
  Gregory, 
  D.Sc. 
  ; 
  and 
  Mr. 
  E. 
  S. 
  Goodrich, 
  M.A.Oxon. 
  

  

  PARTS 
  READY 
  

  

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  PART 
  I. 
  

  

  (sEC'tiND 
  fascicle) 
  

  

  INTRODUCTION 
  

  

  and 
  

  

  PROTOZOA 
  

  

  PART 
  II. 
  

  

  PORIFERA 
  

  

  and 
  

  

  COELENTERA 
  

  

  PART 
  III. 
  

  

  THE 
  

   EGHINODERMA 
  

  

  PART 
  IV. 
  

  

  MESOZOA 
  

  

  PLATYHELMIA 
  

  

  NEMERTINI 
  

  

  *^* 
  The 
  Following 
  Parts 
  are 
  in 
  active 
  Preparation 
  and 
  it 
  is 
  expected 
  

   that 
  they 
  will 
  be 
  ready 
  in 
  spring 
  1905 
  : 
  

  

  PART 
  I. 
  (First 
  Fascicle).- 
  

   PART 
  V.- 
  

  

  -INTRODUGTION 
  AND 
  PROTOZOA. 
  

   MOLLUSCA. 
  

  

  PUBLISHED 
  BY 
  ADAM 
  & 
  CHARLES 
  BLACK, 
  SOHO 
  SQUARE, 
  LONDON, 
  W. 
  

  

  