﻿tiil; 
  anatomy 
  op 
  pceciloch^tus, 
  clapaeede. 
  145 
  

  

  ])rocesse.s 
  arising 
  from 
  the 
  posterior 
  end 
  of 
  the 
  prostomium. 
  

   Neuropodial 
  cirrus 
  of 
  the 
  first 
  segment 
  well-developed, 
  noto- 
  

   podial 
  cirrus 
  rudimentary. 
  Neuropodial 
  and 
  uotopodial 
  cirri 
  

   from 
  the 
  seventh 
  to 
  the 
  eleventh 
  (or 
  to 
  the 
  thirteenth) 
  

   segments 
  flask-shaped^ 
  with 
  long, 
  stiff 
  necks. 
  Gills 
  on 
  the 
  

   parapodia 
  from 
  seginent 
  21 
  backwards. 
  Chastge 
  from 
  the 
  

   seventeenth 
  segment 
  backwards 
  mostly 
  with 
  long 
  hairs; 
  

   those 
  of 
  the 
  notopodium 
  in 
  the 
  most 
  posterior 
  segments 
  stout 
  

   hooks, 
  forming 
  transverse 
  rows 
  on 
  the 
  dorsal 
  surface 
  of 
  the 
  

   body. 
  Anns 
  dorsal, 
  with 
  two 
  long 
  and 
  two 
  short 
  cirri. 
  

   Dorsal 
  blood-vessel 
  with 
  large, 
  lateral 
  pouches 
  in 
  segments 
  

   12, 
  13, 
  14, 
  and 
  15. 
  

  

  Two 
  species 
  (provisionally) 
  — 
  

  

  Pcecilochsetus 
  fulgoris, 
  Claparede. 
  Anterior 
  dorsal 
  

   surface 
  of 
  the 
  body 
  richly 
  provided 
  with 
  tubercles. 
  Para- 
  

   podial 
  cirri 
  of 
  segments 
  7 
  to 
  11 
  different 
  from 
  those 
  on 
  the 
  

   rest 
  of 
  the 
  body, 
  being 
  flask-shaped, 
  with 
  long, 
  stiff 
  necks. 
  

   Second, 
  third 
  and 
  fourth 
  segments 
  with 
  short, 
  stout 
  spines 
  

   in 
  the 
  neuropodium. 
  Nnchal 
  organ 
  moderately 
  developed 
  (?). 
  

  

  PoecilochfGtus 
  serpens, 
  n. 
  sp. 
  Anterior 
  dorsal 
  surface 
  

   smooth, 
  with 
  few 
  tubercles. 
  Parapodial 
  cirri 
  of 
  segments 
  7 
  

   to 
  13 
  (in 
  the 
  adult) 
  different 
  from 
  those 
  on 
  the 
  rest 
  of 
  the 
  

   body, 
  being 
  flask-shaped, 
  with 
  long, 
  stiff 
  necks. 
  Second 
  and 
  

   third 
  segments 
  only 
  with 
  short, 
  stout 
  spines 
  in 
  the 
  neuro- 
  

   podium. 
  Nuchal 
  organ 
  greatly 
  developed, 
  forming 
  three 
  long 
  

   tentacle-like 
  processes. 
  

  

  LiTEEATUEE. 
  

  

  1843. 
  Oersted.—' 
  Ann. 
  dan. 
  conspectus. 
  I. 
  Maricoliic,' 
  1843, 
  p. 
  41. 
  

  

  1844. 
  Oersted. 
  — 
  "Zur 
  Classification 
  der 
  Annulaten," 
  'Wiegm. 
  Arcli. 
  f. 
  

   Naturgescli,' 
  p. 
  107. 
  

  

  1863. 
  ClapaTxEde. 
  — 
  ' 
  Beobaclitungcn 
  iibcr 
  Anatomic 
  inid 
  Entwicklungs- 
  

   gescliiclitewirbellosen 
  Tliiei'c 
  an 
  dcr 
  Kiiste 
  von 
  Norniandie 
  angestellt,' 
  

   Leipzig. 
  

  

  18CS. 
  Claparede, 
  Ed. 
  — 
  " 
  L&s 
  Annelidcs 
  Clietopodes 
  du 
  Golfc 
  de 
  Naples," 
  

   Geneve. 
  

  

  