﻿[31] 
  ANNELIDA 
  CH.ETOPODA. 
  737 
  

  

  across 
  the 
  dorsum, 
  forming 
  a 
  low 
  ridge 
  between 
  the 
  eggs 
  on 
  opposite 
  

   sides 
  of 
  the 
  same 
  segment. 
  On 
  this 
  specimen 
  they 
  appeared 
  first 
  at 
  

   about 
  the 
  middle 
  of 
  the 
  body. 
  

  

  Half-tide, 
  soft 
  mud. 
  Found 
  only 
  at 
  " 
  Clam 
  Cove," 
  in 
  Saint 
  Andrew's 
  

   Bay. 
  

  

  PRIONOSPIO 
  Malmgren, 
  

  

  Prionospio 
  Steenstrtjpi 
  Malmgren. 
  

  

  Malmgren. 
  Annulat. 
  Polych., 
  p. 
  93, 
  pi. 
  ix, 
  fig. 
  55. 
  1867. 
  

  

  The 
  tentacles 
  are 
  long, 
  delicate, 
  similar 
  to 
  those 
  described 
  for 
  Prio- 
  

   nospio 
  plumosa 
  by 
  Sars. 
  

  

  The 
  head 
  rests 
  on 
  the 
  buccal 
  segment; 
  the 
  sides 
  of 
  this 
  segment, 
  back 
  

   of 
  its 
  rami, 
  curve 
  inward, 
  so 
  as 
  almost 
  to 
  cut 
  it 
  off 
  from 
  the 
  second 
  seg- 
  

   ment. 
  The 
  buccal 
  segment 
  has 
  both 
  dorsal 
  and 
  ventral 
  rami. 
  Eyes, 
  

   four, 
  black, 
  circular; 
  anterior 
  pair 
  farther 
  apart 
  than 
  the 
  posterior. 
  The 
  

   branchiae 
  do 
  not 
  arise 
  from 
  the 
  first 
  segment, 
  but 
  are 
  found 
  on 
  seg- 
  

   ments 
  2-5. 
  

  

  General 
  color, 
  greenish 
  ; 
  branchiae, 
  red. 
  Not 
  common 
  ; 
  sand 
  and 
  

  

  shells, 
  10-15 
  fathoms. 
  

  

  POLYDORA 
  Bosc. 
  

  

  POLYDORA 
  CILIATA 
  A. 
  AgctSSiz. 
  

   Annals 
  Lye. 
  Nat. 
  Hist., 
  vol. 
  viii, 
  p. 
  323, 
  figs. 
  26-38. 
  1866. 
  

  

  It 
  does 
  not 
  seem 
  probable 
  that 
  the 
  species 
  described 
  by 
  Agassiz 
  is 
  

   identical 
  with 
  Leucodore 
  ciliatus 
  Johnston, 
  which 
  species 
  again 
  is 
  not 
  

   the 
  same 
  as 
  Leucodora 
  ciliata 
  Keferstein. 
  We 
  understand 
  Professor 
  

   Verrill 
  to 
  concur 
  in 
  this 
  view, 
  and 
  as 
  our 
  material 
  is 
  not 
  in 
  good 
  condi- 
  

   tion, 
  prefer 
  to 
  leave 
  the 
  whole 
  subject 
  with 
  him. 
  

  

  POLYDORA 
  gracilis 
  Verrill. 
  

   Proceedings 
  U. 
  S. 
  National 
  Museum, 
  p. 
  174. 
  1879. 
  

  

  Our 
  specimens 
  were 
  found 
  under 
  the 
  same 
  conditions 
  as 
  those 
  indi- 
  

   cated 
  by 
  Professor 
  Verrill, 
  and, 
  for 
  the 
  most 
  part, 
  agree 
  with 
  his 
  descrip- 
  

   tion. 
  He 
  states, 
  however, 
  that 
  on 
  the 
  sixth 
  and 
  following 
  segments 
  

   there 
  are, 
  with 
  the 
  capillary 
  setae, 
  three 
  or 
  four 
  uncini 
  in 
  the 
  dorsal 
  

   fascicles. 
  This 
  is 
  not 
  the 
  case 
  with 
  our 
  specimens. 
  Sometimes 
  the 
  

   head 
  is 
  slightly 
  bilobed 
  in 
  front, 
  but 
  this 
  is 
  not 
  always 
  the 
  case. 
  An 
  

   elevated 
  carina 
  extends 
  back 
  to 
  the 
  fourth 
  segment. 
  The 
  number 
  of 
  

   eyes 
  is 
  variable 
  ; 
  there 
  may 
  be 
  none, 
  or 
  one, 
  two, 
  three, 
  or 
  four. 
  

  

  On 
  shells 
  of 
  Pecten 
  tenuicostatus, 
  10-35 
  fathoms. 
  

  

  DIPOLYDORA 
  Verrill. 
  

  

  DlPOLYDORA 
  conchartjm 
  Verrill. 
  

  

  Pohjdora 
  concharum 
  Verrill. 
  Proc. 
  U. 
  S. 
  National 
  Museum, 
  p. 
  174. 
  1679. 
  

   Dipolydora 
  concharum 
  Verrill. 
  Trans. 
  Conn. 
  Acad., 
  p. 
  320, 
  foot-note. 
  1881. 
  

  

  Not 
  common 
  ; 
  20-30 
  fathoms, 
  on 
  shells. 
  

   S. 
  Mis. 
  70 
  47 
  

  

  