﻿STEUOTUEE 
  AND 
  CLASSIFICATION 
  OF 
  THE 
  AKACHNIDA. 
  185 
  

  

  '' 
  prEegenital 
  somite 
  " 
  persists 
  in 
  a 
  rudimentary 
  condition, 
  

   forming 
  a 
  *' 
  waist 
  '^ 
  to 
  the 
  series 
  of 
  somites 
  in 
  the 
  Pedipalpi 
  

   and 
  Aranea). 
  The 
  present 
  writer 
  is 
  of 
  opinion 
  that 
  it 
  will 
  be 
  

  

  f— 
  -con. 
  tiss. 
  

  

  Fig. 
  25. 
  — 
  Section 
  tlirougli 
  one 
  of 
  tlie 
  central 
  eyes 
  of 
  a 
  young 
  

   Limulus. 
  L, 
  cuiicular 
  or 
  corneous 
  lens; 
  //_y, 
  epidermic 
  cell-layer; 
  

   cor/i., 
  its 
  coriieagen 
  portion 
  immediately 
  underlying 
  the 
  lens; 
  rel., 
  

   relinula 
  cells 
  ; 
  ?//, 
  nerve- 
  fibres 
  ; 
  con. 
  iiss., 
  connective 
  tissue 
  (meso- 
  

   blastic 
  skeletal 
  tissue). 
  (After 
  Lankester 
  and 
  Bourne, 
  'Q. 
  J. 
  Micr. 
  

   Sci.,' 
  1883.) 
  

  

  found 
  most 
  convenient 
  to 
  treat 
  this 
  evanescent 
  somite 
  as 
  some- 
  

   thing 
  special, 
  and 
  not 
  to 
  attempt 
  to 
  reckon 
  it 
  to 
  either 
  the 
  

   prosoma 
  or 
  the 
  mesosoma. 
  These 
  will 
  then 
  remain 
  as 
  typically- 
  

   composed 
  each 
  of 
  six 
  appendage-bearing 
  somites 
  — 
  the 
  prosoma 
  

  

  