﻿192 
  

  

  E. 
  KAY 
  LANKKSTER. 
  

  

  "brick-red 
  glands'" 
  by 
  Packard 
  liave 
  the 
  same 
  structure 
  

   and 
  position 
  as 
  tlie 
  coxal 
  glands 
  of 
  Scorpio 
  and 
  My 
  gale. 
  In 
  

   Liniulus 
  these 
  organs 
  consist 
  each 
  of 
  four 
  horizontal 
  lobes 
  

   lying 
  on 
  the 
  coxal 
  margin 
  of 
  the 
  second, 
  third, 
  fourth, 
  and 
  

   fifth 
  prosomatic 
  limbs, 
  the 
  four 
  lobes 
  being 
  connected 
  to 
  one 
  

   another 
  by 
  a 
  transverse 
  piece 
  or 
  stem 
  (Fig. 
  28). 
  Micro- 
  

  

  FiG. 
  27. 
  

  

  Fig. 
  2S. 
  

  

  Fig. 
  27. 
  — 
  Diagram 
  showing 
  the 
  position 
  of 
  the 
  coxal 
  glands 
  of 
  a 
  

   Scorpion, 
  Bu 
  thus 
  aust 
  ralis, 
  Lin., 
  in 
  relation 
  to 
  the 
  legs, 
  dia- 
  

   phragm 
  (enlosternal 
  flap), 
  and 
  the 
  gastric 
  caeca. 
  1 
  to 
  6, 
  the 
  bases 
  

   of 
  tlie 
  six 
  prosomatic 
  limbs; 
  A, 
  prosomalic 
  gastric 
  gland 
  (sometimes 
  

   called 
  salivarj) 
  ; 
  B, 
  coxal 
  gland 
  ; 
  C, 
  diaphragm 
  of 
  Newport 
  = 
  fibrous 
  

   flap 
  of 
  the 
  entosternum 
  ; 
  1), 
  meso&omatic 
  gastric 
  ca>ca 
  (so-called 
  

   liver); 
  E, 
  alimentary 
  canal. 
  (From 
  Lankester, 
  'Q. 
  J. 
  Micr. 
  Sci.,' 
  

   vol.xxiv, 
  N.S., 
  p. 
  152.) 
  

  

  Fig. 
  28. 
  — 
  The 
  right 
  coxal 
  gland 
  of 
  Limulus 
  polyphemus, 
  

   Latr. 
  e^ 
  to 
  a^, 
  posterior 
  borders 
  of 
  the 
  cliitinous 
  bases 
  of 
  the 
  

   coxa; 
  of 
  the 
  second, 
  third, 
  fourth, 
  and 
  fifth 
  prosomatic 
  limbs; 
  b, 
  

   longitudinal 
  lobe 
  or 
  stolon 
  of 
  the 
  coxal 
  gland 
  ; 
  c, 
  its 
  four 
  transverse 
  

   lobes 
  or 
  outgrowths 
  corresponding 
  to 
  the 
  four 
  coxae. 
  (From 
  

   Lankester, 
  loc. 
  cit., 
  after 
  Packard.) 
  

  

  scopically 
  their 
  structure 
  is 
  the 
  same 
  in 
  essentials 
  as 
  that 
  of 
  

   the 
  coxal 
  glands 
  of 
  Scorpio 
  (13). 
  Coxal 
  glands 
  have 
  since 
  

   been 
  recognised 
  and 
  described 
  in 
  other 
  Arachnida. 
  It 
  has 
  

   lately 
  (1900) 
  been 
  shown 
  that 
  the 
  coxal 
  gland 
  of 
  Limulus 
  is 
  

   provided 
  with 
  a 
  very 
  delicate 
  thin-walled 
  coiled 
  duct 
  which 
  

  

  