﻿244 
  a. 
  RAY 
  LANKtiSTER. 
  

  

  jointed 
  flagelbim. 
  Opistliosoma 
  without 
  post-anal 
  sclerite 
  

   and 
  posterior 
  caudal 
  elongation, 
  with 
  frequently 
  a 
  pair 
  of 
  

   small 
  lobate 
  appendages 
  on 
  the 
  sternum 
  of 
  the 
  third 
  somite. 
  

   Respiratory 
  organs 
  as 
  in 
  Urotricha. 
  

  

  II 
  III 
  IV 
  V 
  VI 
  5 
  11 
  pa 
  

  

  Fig. 
  59. 
  — 
  Scliizomus 
  crassicaudatus, 
  one 
  of 
  the 
  Pedipalpi. 
  

   Lateral 
  view 
  of 
  a 
  male. 
  II 
  to 
  VI, 
  the 
  piosomatic 
  appendages, 
  the 
  

   first 
  being 
  concealed 
  (see 
  Tig. 
  58) 
  ; 
  5, 
  the 
  fifth, 
  and 
  11, 
  the 
  eleventli 
  

   tergites 
  of 
  the 
  opisthosoma; 
  pa, 
  the 
  conical 
  post-anal 
  lobe. 
  (Ori- 
  

   ginal 
  as 
  above.) 
  

  

  Family 
  — 
  Phrynichidee 
  (Phrynichus, 
  Damon). 
  

   „ 
  AdmetidaB 
  (A 
  dmetus 
  Heterophrynus). 
  

   „ 
  Charontidae 
  (Charon, 
  Sarax). 
  

   (Family 
  ?) 
  "^Greraphrynus. 
  

  

  Remarks. 
  — 
  The 
  Pedipalpi 
  are 
  confined 
  to 
  the 
  tropics 
  and 
  

   warmer 
  temperate 
  regions 
  of 
  both 
  hemispheres. 
  Fossil 
  

   forms 
  occur 
  in 
  the 
  Carboniferous. 
  The 
  small 
  forms 
  known 
  

   as 
  Scliizomus 
  and 
  Hubbardia 
  are 
  of 
  special 
  interest 
  from 
  

   a 
  morphological 
  point 
  of 
  view. 
  The 
  Pedipalpi 
  have 
  no 
  poison 
  

   glands. 
  (Reference 
  to 
  literature, 
  29.) 
  

  

  Order 
  3. 
  Araneae 
  (Figs. 
  60 
  to 
  64). 
  — 
  Prosoma 
  covered 
  with 
  

   a 
  single 
  shield 
  and 
  typically 
  furnished 
  with 
  median 
  and 
  

   lateral 
  eyes 
  of 
  diplostichous 
  structure, 
  as 
  in 
  the 
  Amblypygi. 
  

   Its 
  sternal 
  surface 
  wide, 
  continuously 
  chitinised, 
  but 
  with 
  

   prosternal 
  and 
  metasternal 
  elements 
  generally 
  distinguishable 
  

   at 
  the 
  anterior 
  and 
  posterior 
  ends 
  respectively 
  of 
  the 
  large 
  

   mesosternum. 
  Presternum 
  underlying 
  the 
  proboscis. 
  Ap- 
  

   pendages 
  of 
  first 
  pair 
  have 
  two 
  segments, 
  as 
  in 
  Pedipalpi, 
  

   but 
  are 
  furnished 
  with 
  poison 
  gland, 
  and 
  are 
  retroverts. 
  

   Appendages 
  of 
  second 
  pair 
  not 
  underlyiug 
  the 
  mouth, 
  but 
  

   freely 
  movable, 
  and 
  except 
  in 
  primitive 
  forms 
  furnished 
  with 
  

   a 
  maxillary 
  lobe; 
  the 
  rest 
  of 
  the 
  limb 
  like 
  the 
  legs, 
  tipped 
  

  

  