﻿[17J 
  ANNELIDA 
  CHiETOPODA. 
  723 
  

  

  Head 
  short, 
  concave 
  in 
  front 
  and 
  behind 
  ; 
  dorsal 
  and 
  ventral 
  eyes 
  

   with 
  lenses; 
  anterior 
  antennae 
  bifurcated, 
  roughened, 
  and 
  covered 
  with 
  

   numerous 
  hairs; 
  the 
  anteume 
  back 
  of 
  these 
  short, 
  increasing 
  in 
  diame- 
  

   ter 
  from 
  origin 
  to 
  apex; 
  median 
  antenna 
  and 
  superior 
  tentacular 
  cirri 
  

   very 
  long, 
  regularly 
  tapering. 
  

  

  The 
  feet 
  of 
  the 
  first 
  three 
  segments 
  are 
  conical, 
  a 
  trifle 
  flattened; 
  

   their 
  dorsal 
  cirri 
  (tig. 
  54) 
  arise 
  near 
  their 
  base 
  from 
  stout 
  rouuded 
  basal 
  

   articles 
  ; 
  on 
  the 
  fourth 
  segment 
  the 
  feet 
  become 
  irregularly 
  cylindrical; 
  

   the 
  dorsal 
  cirri 
  originate 
  near 
  the 
  apex 
  (figs. 
  52, 
  53) 
  and 
  are 
  enlarged 
  

   at 
  base; 
  capillary 
  (sexual) 
  seta? 
  appear 
  on 
  this 
  segment 
  and 
  persist 
  on 
  

   al! 
  save 
  the 
  last 
  two 
  segments. 
  The 
  feet 
  elongate 
  gradually 
  to 
  about 
  

   the 
  eighth 
  segment, 
  where 
  they 
  equal 
  the 
  width 
  of 
  the 
  body; 
  they 
  

   shorten 
  again 
  along 
  the 
  posterior 
  third. 
  

  

  The 
  compound 
  seta) 
  are 
  of 
  the 
  usual 
  form, 
  but 
  quite 
  long; 
  a 
  little 
  

   longer 
  on 
  the 
  first 
  three 
  segments 
  than 
  afterwards. 
  

  

  Color, 
  brownish-red. 
  

  

  Length, 
  5 
  TOm 
  . 
  

  

  Width 
  in 
  the 
  middle, 
  without 
  feet, 
  0.25 
  lum 
  ; 
  with 
  feet, 
  0.7 
  IU1 
  ". 
  

  

  PEOCERyEA 
  Elders. 
  

   Piiocer^ea 
  gracilis 
  Verrill. 
  

  

  Vekiui.l. 
  American 
  Jonrual 
  of 
  Science, 
  vol. 
  vii, 
  p. 
  132, 
  pi. 
  v, 
  tig. 
  1. 
  1874. 
  

  

  Out 
  specimens, 
  in 
  all 
  probability, 
  belong 
  to 
  this 
  species. 
  The 
  epau- 
  

   lets, 
  however, 
  are 
  much 
  wider 
  than 
  figured 
  by 
  Verrill 
  ; 
  in 
  fact, 
  they 
  

   nearly 
  cover 
  the 
  buccal 
  segment, 
  leaving 
  a 
  narrow 
  triangular 
  space 
  in 
  

   the 
  middle; 
  they 
  are 
  yellowish-brown, 
  with 
  a 
  yellowish- 
  white 
  margin. 
  

   The 
  body 
  is 
  white, 
  or 
  yellowish-white; 
  there 
  is 
  a 
  broad, 
  median, 
  brown 
  

   band, 
  which 
  runs 
  the 
  whole 
  length 
  of 
  the 
  body; 
  similar 
  lateral 
  brown 
  

   bands 
  extending 
  to 
  the 
  middle 
  of 
  the 
  body, 
  or, 
  if 
  prolonged 
  beyond 
  

   the 
  middle, 
  becoming 
  fainter. 
  Anteume 
  and 
  all 
  cirri 
  covered 
  with 
  stiff 
  

   hairs 
  and 
  filled 
  with 
  gleaming 
  granules. 
  The 
  pharynx 
  is 
  much 
  convo- 
  

   luted; 
  it 
  occupies 
  seven 
  segments; 
  the 
  stomach, 
  three 
  segments. 
  The 
  

   palpi 
  project 
  beyond 
  the 
  head 
  as 
  a 
  thin 
  rounded 
  rim, 
  with 
  a 
  shallow, 
  

   median, 
  impressed 
  line 
  above 
  and 
  below. 
  

  

  No 
  adult 
  females 
  were 
  found. 
  In 
  two 
  specimens, 
  not 
  yet 
  separated 
  

   from 
  the 
  stem 
  form, 
  the 
  head 
  originated 
  just 
  back 
  of 
  the' 
  fourteenth 
  

   segment; 
  sexual 
  setse 
  on 
  the 
  eighth 
  segment 
  behind 
  the 
  head; 
  and 
  on 
  

   1 
  hose 
  specimens 
  were 
  found 
  only 
  on 
  14 
  segments, 
  followed 
  by 
  many 
  seg- 
  

   ments 
  with 
  the 
  ordinary 
  seta? 
  only. 
  The 
  length 
  of 
  the 
  median 
  antenna 
  

   was 
  about 
  twice 
  the 
  width 
  of 
  the 
  body 
  ; 
  lateral 
  antenna) 
  two-thirds 
  as 
  

   long 
  as 
  the 
  median; 
  tentacular 
  cirri 
  formed, 
  but 
  still 
  very 
  short. 
  The 
  

   eggs 
  were 
  numerous, 
  pink. 
  

  

  Only 
  one 
  adult 
  male 
  was 
  taken. 
  This 
  is 
  very 
  much 
  like 
  (Ersted 
  ? 
  s 
  

   Polybostrichus 
  longosetosus 
  ; 
  indeed, 
  it 
  seems 
  to 
  us 
  to 
  be 
  identical 
  with 
  

   ii. 
  We 
  understand 
  Professor 
  Verrill 
  not 
  to 
  concur 
  in 
  this 
  view, 
  and 
  

  

  