﻿202 
  

  

  E. 
  RAY 
  LANKESTER. 
  

  

  It 
  is 
  very 
  probable 
  that 
  in 
  Scorpio 
  they 
  do 
  not 
  serve 
  merely 
  

   to 
  secrete 
  a 
  digestive 
  fluid 
  (shown 
  in 
  other 
  Arthropoda 
  to 
  

   resemble 
  the 
  pancreatic 
  fluid), 
  but 
  that 
  tliey 
  also 
  become 
  

  

  Fig. 
  33. 
  — 
  Tlie 
  alimentaiy 
  canul 
  and 
  gastric 
  trlands 
  of 
  a 
  Scorpion 
  

   (A) 
  and 
  of 
  Linuilus 
  (B). 
  /«, 
  muscular 
  suctorial 
  enlargenieiil 
  of 
  the 
  

   pharynx 
  ; 
  sal, 
  prosomatic 
  pair 
  of 
  gastric 
  ca?ca 
  in 
  Scorpio, 
  called 
  

   salivary 
  glands 
  by 
  some 
  writers 
  ; 
  c' 
  and 
  c-, 
  the 
  anterior 
  two 
  pairs 
  of 
  

   gastric 
  creca 
  and 
  ducts 
  of 
  the 
  mesosomatic 
  region; 
  c^, 
  c*, 
  and 
  c% 
  

   cffica 
  and 
  ducts 
  of 
  Scorpio 
  not 
  represented 
  in 
  Limulus; 
  M, 
  the 
  

   Malpighian 
  or 
  renal 
  ca;cal 
  diverticula 
  of 
  Scorpio; 
  /;;-o, 
  the 
  procto- 
  

   da;um 
  or 
  portion 
  of 
  gut 
  leading 
  to 
  anus, 
  and 
  formed 
  embryologically 
  

   by 
  an 
  inversion 
  of 
  the 
  epiblast 
  at 
  that 
  orifice. 
  (IVom 
  Lankester, 
  

   " 
  Limulus 
  an 
  Arachnid.") 
  

  

  distended 
  by 
  the 
  juices 
  of 
  the 
  prey 
  sucked 
  in 
  by 
  the 
  scorpion 
  

   — 
  as 
  certainly 
  must 
  occur 
  in 
  the 
  case 
  of 
  the 
  simple 
  un- 
  

   brancbed 
  gastric 
  casca 
  of 
  the 
  spiders. 
  

  

  The 
  most 
  important 
  difference 
  Avhich 
  exists 
  between 
  the 
  

  

  