﻿]70 
  

  

  E. 
  KAY 
  LANK 
  ESTER. 
  

  

  Fig. 
  8. 
  

  

  structure 
  of 
  Limulus 
  and 
  the 
  Eurypterines 
  

   on 
  tlie 
  one 
  hand, 
  and 
  that 
  of 
  a 
  typical 
  

   Arachnid, 
  such 
  as 
  Scorpio, 
  on 
  the 
  other, 
  

   had 
  been 
  vitiated 
  by 
  erroueous 
  notions 
  as 
  

   to 
  tlie 
  origin 
  of 
  the 
  nerves 
  supplying 
  the 
  

   anterior 
  appendages 
  of 
  Limulus 
  (which 
  

   were 
  finally 
  removed 
  by 
  Alphonse 
  Milne- 
  

   Edwards 
  in 
  his 
  beautiful 
  memoir 
  [6] 
  on 
  

   the 
  structure 
  of 
  that 
  animal), 
  and 
  secondly 
  

   by 
  the 
  erroneous 
  identification 
  of 
  the 
  double 
  

  

  Fig. 
  9. 
  

  

  Fig. 
  S. 
  — 
  Diagram 
  o( 
  the 
  dorsal 
  surface 
  of 
  a 
  Scorpion 
  to 
  compare 
  

   with 
  Fip;. 
  7. 
  Lelters 
  and 
  Roman 
  numerals 
  as 
  in 
  Fig. 
  7, 
  excepting 
  

   that 
  Vll 
  is 
  iiere 
  certainly 
  tlie 
  tergum 
  of 
  the 
  first 
  somite 
  of 
  the 
  

   niesosoma 
  — 
  the 
  genital 
  somite 
  — 
  and 
  is 
  not 
  a 
  survival 
  of 
  the 
  embry- 
  

   onic 
  prjEgenital 
  somite. 
  (From 
  Lankester, 
  loc. 
  cit.) 
  The 
  anus 
  (not 
  

   seen) 
  is 
  on 
  the 
  sternal 
  surface. 
  

  

  Fig. 
  9. 
  — 
  Ventral 
  view 
  of 
  the 
  posterior 
  carapace 
  or 
  meso-mela- 
  

   somatic 
  (opisiliosomatic) 
  fusion 
  of 
  Limulus 
  polyphemus. 
  Tlie 
  

   soft 
  integument 
  and 
  limbs 
  of 
  the 
  niesosoma 
  have 
  been 
  removed 
  as 
  

   well 
  as 
  all 
  the 
  viscera 
  and 
  muscles, 
  so 
  that 
  the 
  inner 
  surface 
  of 
  the 
  

   terga 
  of 
  these 
  somites 
  with 
  their 
  entopophyses 
  are 
  seen. 
  The 
  un- 
  

   segmented 
  dense 
  chitinous, 
  sternal 
  plate 
  of 
  the 
  metasonia 
  (XIII 
  to 
  

   XVIII) 
  is 
  not 
  removed. 
  Letters 
  as 
  in 
  Fig. 
  7. 
  (After 
  Lankester, 
  

   loc. 
  cit.) 
  

  

  