﻿360 
  

  

  MARGERY 
  MOSELEY. 
  

  

  belonging 
  to 
  the 
  subfamily 
  Aristasinge. 
  Alcock^ 
  gives 
  the 
  

   following 
  formula 
  for 
  the 
  subgenera 
  Plesiopeneus,Arist9e- 
  

   omorpha 
  and 
  Aristasopsis 
  of 
  the 
  genus 
  Aristaeus 
  and 
  

   for 
  the 
  genera 
  Benthesicymus 
  and 
  G-ennadas. 
  

  

  24 
  + 
  7 
  ep. 
  

  

  A 
  pi'actically 
  identical 
  formula 
  is 
  given 
  by 
  Boas 
  "for 
  the 
  

   aberrant 
  Penasid 
  Cerataspis 
  longiremis. 
  

  

  The 
  formula 
  given 
  by 
  Professor 
  Huxley 
  for 
  Astacus 
  

   fluviatilis 
  is 
  as 
  follows^ 
  : 
  — 
  

  

  Somite. 
  

  

  VIE 
  

  

  A^III 
  

  

  IX 
  

  

  X 
  

  

  XI 
  

  

  XII 
  

  

  XIII 
  

  

  XIV 
  

  

  Podo- 
  

   brancliise. 
  

  

  (ep. 
  

  

  Arthro- 
  

   brancliise. 
  

  

  

  

  1 
  

  

  2 
  

   2 
  

   2 
  

   2 
  

   2 
  

   

  

  Pleuio- 
  

   branclilse. 
  

  

  

  

  

  

  

  

  

  

  or 
  r 
  

  

  r 
  

  

  r 
  

  

  1 
  

  

  Total, 
  

   ep. 
  

   2 
  

   3 
  

   3 
  

   3 
  + 
  or 
  r 
  

   3 
  + 
  r 
  

   3 
  + 
  r 
  

   1 
  

  

  18 
  + 
  ep 
  + 
  2r 
  or 
  3r 
  

  

  1 
  'Descr. 
  Catalogue 
  Indian 
  Deep-Sea 
  Crustacea,' 
  pp. 
  '65, 
  etc. 
  (190J). 
  

  

  2 
  ' 
  Vidensk. 
  Selsk. 
  Skr. 
  6 
  Raekke, 
  naturvid. 
  matli. 
  Afd.,' 
  i 
  (2), 
  p. 
  43 
  

   (1880). 
  Cf. 
  also 
  Claus, 
  ' 
  Arb. 
  Zool. 
  lust. 
  Wien,' 
  vi, 
  p. 
  49 
  (1885) 
  and 
  

   Bounier, 
  ' 
  Trav. 
  Stat. 
  Zool. 
  Wimereux,' 
  vii, 
  p. 
  38 
  (1899). 
  

  

  ^ 
  Huxley 
  does 
  not 
  enumerate 
  the 
  epipodites 
  accompanying 
  the 
  podobranchs 
  

   as 
  is 
  done 
  in 
  the 
  formula 
  quoted 
  above 
  from 
  Alcock. 
  

  

  