﻿m 
  

  

  Annelida 
  celet-oPoda. 
  713 
  

  

  rest, 
  or 
  in 
  preserved 
  specimens, 
  the 
  form 
  and 
  relative 
  dimensions 
  are 
  

   those 
  shown 
  in 
  the 
  figure. 
  The 
  apex 
  of 
  the 
  head 
  is 
  bluntly 
  rounded 
  

   and 
  with 
  a 
  slight 
  median 
  emargination. 
  

  

  The 
  antennae 
  are 
  delicate; 
  the 
  superior 
  as 
  long, 
  or 
  even 
  a 
  little 
  longer, 
  

   than 
  the 
  head; 
  the 
  inferior 
  about 
  two-thirds 
  as 
  long 
  as 
  the 
  superior 
  and 
  

   a 
  trifle 
  stouter. 
  

  

  The 
  eyes 
  are 
  large, 
  oval, 
  black, 
  situated 
  just 
  back 
  of 
  the 
  origin 
  of 
  the 
  

   superior 
  antenna?. 
  

  

  The 
  tentacular 
  cirri 
  are 
  swollen 
  at 
  base, 
  fusiform 
  ; 
  outer 
  two-thirds 
  

   tapering 
  rapidly; 
  outer 
  third 
  very 
  delicate, 
  filiform; 
  they 
  arise 
  from 
  

   stout, 
  elongated 
  basal 
  articles, 
  which 
  increase 
  somewhat 
  in 
  diameter 
  

   from 
  their 
  origin 
  outward. 
  The 
  superior 
  cirri 
  of 
  the 
  second 
  segment 
  

   are 
  the 
  longest, 
  reaching 
  back 
  to 
  the 
  anterior 
  margin 
  of 
  the 
  fifth 
  setig- 
  

   erous 
  segment; 
  the 
  inferior 
  cirri 
  of 
  the 
  same 
  segment 
  are 
  from 
  one- 
  

   half 
  to 
  two-thirds 
  as 
  long; 
  the 
  cirri 
  of 
  the 
  first 
  segment 
  about 
  three- 
  

   •fourths 
  as 
  long. 
  

  

  The 
  dorsal 
  cirri 
  are 
  broad, 
  heart-shaped 
  (fig. 
  11), 
  swollen, 
  sessile, 
  re- 
  

   mote 
  from 
  the 
  foot. 
  The 
  ventral 
  cirri 
  are 
  oval, 
  arise 
  from 
  the 
  lower 
  

   surface 
  of 
  the 
  foot 
  near 
  its 
  base; 
  the 
  line 
  of 
  union 
  with 
  the 
  foot 
  is 
  really 
  

   short, 
  but 
  when 
  seen 
  from 
  behind 
  they 
  appear 
  to 
  be 
  attached 
  along 
  their 
  

   entire 
  upper 
  margin, 
  having 
  only 
  a 
  short 
  projecting 
  free 
  part 
  at 
  the 
  

   apex 
  ; 
  they 
  are 
  swollen 
  like 
  the 
  dorsal 
  cirri. 
  The 
  form 
  and 
  relative 
  posi- 
  

   tion 
  of 
  feet, 
  dorsal 
  and 
  ventral 
  rami, 
  remain 
  the 
  same 
  throughout, 
  but 
  

   they 
  are 
  slightly 
  smaller 
  on 
  a 
  few 
  of 
  the 
  anterior 
  and 
  posterior 
  seg- 
  

   ments. 
  The 
  anal 
  cirri 
  (fig. 
  13) 
  are 
  every 
  way 
  similar 
  to 
  the 
  ventral 
  cirri. 
  

  

  The 
  seta? 
  are 
  not 
  numerous; 
  all 
  have 
  the 
  form 
  shown 
  in 
  the 
  figure 
  

   (tig. 
  12). 
  The 
  first 
  segment 
  is 
  a 
  little 
  longer 
  than 
  the 
  second; 
  second 
  

   and 
  third 
  equal; 
  fourth, 
  double 
  the 
  second 
  ; 
  remaining 
  segments 
  about 
  

   the 
  length 
  of 
  the 
  fourth, 
  except 
  that 
  a 
  few 
  of 
  the 
  posterior 
  segments 
  

   become 
  progressively 
  a 
  little 
  shorter. 
  

  

  Some 
  specimens 
  were 
  colorless, 
  others 
  light 
  green. 
  Length 
  of 
  largest 
  

   specimen, 
  7""". 
  Width, 
  O.G"" 
  11 
  to 
  O.S' 
  nm 
  . 
  

  

  Six 
  to 
  twelve 
  fathoms 
  ; 
  mud, 
  sand, 
  and 
  shells. 
  

  

  Family 
  HESIONID^E. 
  

   PODARKE 
  Elders. 
  

  

  . 
  PODARKE 
  ABERRANS 
  71. 
  sp. 
  

  

  (Pl. 
  I, 
  Figs. 
  14-18; 
  Pl. 
  II, 
  Figs. 
  19, 
  20.) 
  

  

  It 
  is 
  with 
  some 
  hesitation 
  that 
  we 
  refer 
  this 
  form 
  to 
  Podarke. 
  It 
  

   differs 
  from 
  that 
  genus 
  in 
  the 
  position 
  of 
  the 
  median 
  antenna, 
  in 
  the 
  

   absence 
  of 
  eyes 
  (in 
  the 
  adult), 
  but 
  especially 
  in 
  the 
  peculiar 
  fan-shaped 
  

   appendage 
  attached 
  to 
  the 
  anal 
  segment. 
  We 
  found 
  the 
  same 
  form 
  at 
  

   Provincetown, 
  Mass., 
  in 
  1879, 
  but 
  the 
  specimens 
  were 
  too 
  much 
  in- 
  

  

  