﻿EClilUKOID 
  WORMS 
  OF 
  NORTH 
  PACIFIC 
  — 
  FISHER 
  259 
  

  

  iirpliridia 
  aro 
  luiinorous 
  siil)irlol>uIar 
  umuiual 
  yellow 
  bodies 
  arising 
  

   from 
  the 
  l)ast' 
  of 
  the 
  iiej)hritie 
  eleiiieiits 
  and 
  from 
  the 
  wall 
  of 
  the 
  collect- 
  

   ing 
  tube 
  or 
  branehlet. 
  Xumerous 
  much 
  sni.'dicr 
  brownish-yellow 
  

   papillae 
  occur 
  on 
  the 
  walls 
  of 
  the 
  main 
  stems 
  and 
  branches. 
  I 
  

   could 
  not 
  find 
  the 
  opening 
  into 
  cloaca. 
  

  

  Alimentary 
  canal. 
  The 
  main 
  features 
  of 
  the 
  foregut 
  are 
  shown 
  

   on 
  plate 
  30. 
  The 
  pharyiLX 
  is 
  attached 
  to 
  body 
  wall 
  by 
  very 
  numerous 
  

   crowded 
  ratliating 
  strands. 
  This 
  head 
  cavity 
  is 
  separated 
  from 
  the 
  

   rest 
  of 
  coelom 
  by 
  u 
  translucent 
  diaphragm 
  (D) 
  indicated 
  in 
  the 
  drawing 
  

   incompletely. 
  Its 
  central 
  l)or(ler 
  encircles 
  the 
  gut 
  behind 
  the 
  pharynx, 
  

   and 
  what 
  may 
  be 
  conventionally 
  called 
  the 
  esophagus 
  (extending 
  to 
  

   A' 
  in 
  drawing) 
  has 
  the 
  muscular 
  walls 
  marked 
  by 
  prominent 
  ring 
  

   folds 
  which 
  cause 
  the 
  mucosa 
  to 
  be 
  thrown 
  into 
  transverse 
  welts. 
  

   This 
  muscle 
  layer 
  thins 
  toward 
  end 
  of 
  esophagus 
  and 
  the 
  ring 
  

   becomes 
  narrower. 
  The 
  segment 
  X-Y 
  corresponds 
  to 
  the 
  gizzard 
  of 
  

   BoncUiopsis. 
  The 
  annulation 
  of 
  muscle 
  is 
  closer. 
  At 
  Y 
  the 
  canal 
  

   was 
  broken, 
  and 
  it 
  is 
  possible 
  that 
  something 
  was 
  lost 
  as 
  the 
  segment 
  

   between 
  Y 
  and 
  the 
  beginning 
  of 
  siphon 
  is 
  very 
  short. 
  It 
  corresponds 
  

   to 
  the 
  so-called 
  stomach 
  of 
  Bonelliopsv?. 
  A 
  tough 
  mesentery 
  unites 
  

   loops 
  of 
  the 
  esophagus, 
  whereas 
  in 
  Bonelliopsis 
  the 
  thicker 
  mesentery 
  

   joins 
  the 
  gizzard 
  to 
  stomach. 
  The 
  esophagus 
  has 
  a 
  continuous 
  ventral 
  

   mesentery 
  attached 
  ventrodextrally 
  but 
  the 
  other 
  mesenteric 
  attach- 
  

   ments 
  to 
  body 
  wall 
  are 
  in 
  strands 
  or 
  frenula. 
  

  

  The 
  cloaca 
  is 
  bulbous, 
  with 
  very 
  numerous 
  muscular 
  strands 
  uniting 
  

   its 
  rather 
  muscular 
  wall 
  with 
  l)od\' 
  wall. 
  The 
  anterior 
  of 
  these 
  strands 
  

   pass 
  between 
  the 
  branches 
  of 
  the 
  anal 
  vesicles. 
  The 
  very 
  expanded 
  

   hind-gut 
  seems 
  to 
  be 
  more 
  than 
  an 
  accident 
  of 
  killing, 
  as 
  the 
  condition 
  

   of 
  the 
  mucosa 
  indicates 
  that 
  th(> 
  walls 
  have 
  not 
  been 
  unnaturally 
  

   distended. 
  The 
  j)rominent 
  ciliated 
  groove 
  continues 
  from 
  the 
  narrow 
  

   segment 
  (all 
  the 
  rest 
  of 
  the 
  intestine 
  having 
  been 
  lost) 
  to 
  the 
  beginning 
  

   of 
  the 
  cloaea, 
  where 
  a 
  strand 
  from 
  the 
  ventral 
  blood 
  vessel 
  ends. 
  

   There 
  is 
  no 
  intestinal 
  coeeum 
  at 
  this 
  point. 
  

  

  The 
  vascular 
  system 
  is 
  of 
  the 
  Bonellia 
  type. 
  The 
  neurointestinal 
  

   connective 
  (B^) 
  spreads 
  out 
  fanwise 
  where 
  it 
  joins 
  the 
  ventral 
  vessel 
  

   (B*) 
  and 
  its 
  walls 
  a[)[)ear 
  to 
  be 
  glandular 
  as 
  if 
  a 
  i)art 
  of 
  the 
  gonad 
  

   complex. 
  Actual 
  ova 
  are 
  found 
  iis 
  far 
  forward 
  as 
  the 
  posterior 
  border 
  

   of 
  this 
  fan. 
  

  

  The 
  gonad 
  is 
  of 
  the 
  Bonellia 
  type 
  but 
  extends 
  uiuisually 
  far 
  forward. 
  

  

  Male. 
  Unknown. 
  The 
  foregut 
  was 
  (juite 
  em[)ty, 
  and 
  no 
  males 
  

   were 
  found 
  in 
  the 
  nephridiopore. 
  

  

  Typc.—\J.S.N.\[. 
  No. 
  20005. 
  

  

  Type 
  locality. 
  — 
  Albatross 
  station 
  5021, 
  Okhotsk 
  Seo, 
  off 
  cast 
  coast 
  

   of 
  Sakhalin 
  Island, 
  lat. 
  48° 
  32' 
  30" 
  N., 
  long. 
  145° 
  08' 
  45" 
  E., 
  73 
  

   fathoms, 
  green 
  mud, 
  sand, 
  pebbles, 
  bottom 
  temperature 
  30.9° 
  F. 
  

  

  