﻿ECHIUROID 
  WORMS 
  OF 
  NORTH 
  PACIFIC 
  — 
  FISHER 
  249 
  

  

  already 
  mentionod, 
  and 
  in 
  the 
  probably 
  much 
  longer 
  presiphonal 
  gut. 
  

   Details 
  of 
  the 
  gut 
  are 
  lacking 
  in 
  Sato's 
  figure 
  and 
  des('rii)tion. 
  

  

  Family 
  BONELLIIDAE 
  Baird 
  

  

  Bonellidae 
  Baird 
  (name 
  only), 
  18G8, 
  p. 
  111. 
  (Includes 
  Thalassema 
  and 
  Bonellia.) 
  

  

  Diagnosis. 
  — 
  Dimorphic 
  echiuroids. 
  The 
  male 
  is 
  degenerate, 
  pla- 
  

   narianlike, 
  with 
  ciliated 
  ectoderm, 
  generally 
  one, 
  exceptionally 
  two, 
  

   nephritlia 
  '° 
  serving 
  as 
  sperm 
  receptacles, 
  and 
  a 
  vestigial 
  alimentary 
  

   canal; 
  it 
  lives 
  semiparasitically 
  or 
  parasitically 
  on 
  or 
  in 
  the 
  female," 
  

   and 
  is 
  sometimes 
  absent 
  from 
  female; 
  females 
  resembling 
  Thalassema 
  

   but 
  with 
  bifid 
  proboscis 
  in 
  some 
  genera; 
  two, 
  four, 
  or 
  exceptionally 
  

   many 
  anterior 
  ventral 
  setae 
  are 
  sometimes 
  present; 
  no 
  anal 
  setae; 
  

   anal 
  vesicles 
  with 
  many 
  branches 
  ending 
  in 
  ciliated 
  cups; 
  one 
  to 
  three 
  

   nephridia. 
  

  

  KEY 
  TO 
  GENERA 
  OF 
  BONELLIIDAE 
  

  

  a'. 
  With 
  an 
  elongate 
  proboscis 
  bifid 
  at 
  the 
  end. 
  

  

  6'. 
  With 
  ventral 
  setae 
  " 
  or 
  hooks 
  a 
  short 
  distance 
  behind 
  mouth, 
  

   c*. 
  Regularly 
  one 
  nephridium 
  or 
  egg 
  receptacle 
  (either 
  right 
  or 
  left). 
  

  

  d'. 
  Coelomic 
  aperture 
  of 
  nephridium 
  (i. 
  e., 
  the 
  nephrostome) 
  situated 
  

   near 
  base 
  of 
  the 
  organ, 
  usually 
  at 
  end 
  of 
  a 
  short 
  lateral 
  tube. 
  

  

  Bonellia 
  Rolando 
  

   <P. 
  Large 
  nephrostome 
  at 
  extreme 
  distal 
  end 
  of 
  nephridium 
  and 
  not 
  

  

  facing 
  laterally 
  Bonelliopsis, 
  new 
  genus 
  (p. 
  252) 
  

  

  c'. 
  Regularly 
  2 
  nephridia, 
  having 
  the 
  small 
  nephrostome 
  laterally 
  near 
  

   distal 
  end; 
  a 
  small 
  blind 
  tube 
  opening 
  between 
  nephridiopores 
  serving 
  

   as 
  a 
  permanent 
  androecium 
  for 
  completely 
  parasitic 
  male; 
  gonad 
  of 
  

   female 
  situated 
  on 
  frenula 
  radiating 
  from 
  cloaca; 
  anal 
  vesicles 
  in 
  form 
  

   of 
  tubules 
  opening 
  independently 
  into 
  cloaca 
  (see 
  also 
  Acanthoha- 
  

   mingia) 
  Pseudobonellia 
  Johnston 
  and 
  Ticgs 
  '* 
  

  

  '• 
  Males 
  of 
  Pteudobontllia 
  have 
  two 
  ncphri'lin; 
  other 
  penera 
  one 
  only. 
  

  

  " 
  The 
  male 
  lives 
  In 
  the 
  foreput. 
  In 
  nephridiuni, 
  on 
  proximal 
  portion 
  of 
  proboscis, 
  in 
  ponital 
  proovc 
  (/lean- 
  

   thohamingia) 
  . 
  anrl 
  In 
  a 
  si>cciallzed 
  blind 
  tube 
  or 
  androecium 
  opening 
  between 
  the 
  two 
  nephridiopores 
  {Pteu- 
  

   dobontllia 
  ) 
  . 
  

  

  '« 
  In 
  limellia 
  miyniimai 
  Ikeda 
  (lOW, 
  p. 
  73; 
  1907, 
  p. 
  2, 
  pi. 
  1, 
  rtps. 
  1, 
  2; 
  pi. 
  2, 
  flps. 
  5-17) 
  there 
  are 
  numerous 
  

   (29) 
  very 
  small 
  setae. 
  Ptendobonellia 
  has 
  two 
  to 
  four 
  sctiic; 
  Archiboneltia 
  has 
  four 
  and 
  other 
  pcnora 
  have 
  two 
  

   Mtac, 
  but 
  sometimes 
  o 
  com 
  piemen 
  t/il 
  smaller 
  seta 
  Is 
  In 
  process 
  of 
  prowth 
  and 
  liitcr 
  replaces 
  the 
  fimrtlonal 
  ono. 
  

  

  '« 
  John.ston 
  and 
  Tleps, 
  1910, 
  pp. 
  21.V229, 
  pis. 
  »-ll. 
  This 
  is 
  a 
  very 
  remarkable 
  penus 
  set 
  ai)art 
  from 
  all 
  other 
  

   boncllilds 
  in 
  havlnp 
  a 
  small 
  blind 
  tube, 
  projectinp 
  into 
  coelom 
  and 
  openinp 
  on 
  the 
  ventral 
  body 
  wall 
  between 
  

   the 
  two 
  nephridloiwrcs 
  by 
  a 
  narrow 
  ainal 
  whose 
  walls 
  contain 
  stronp 
  sphincter 
  fibers. 
  In 
  this 
  lives 
  per- 
  

   manently 
  one 
  very 
  depenernto 
  male. 
  Its 
  posterior 
  end 
  prown 
  fast 
  by 
  onlarped 
  ectodermal 
  colls 
  to 
  the 
  much 
  

   smaller 
  epithelial 
  cells 
  of 
  the 
  tubule. 
  The 
  male 
  lacks 
  setae 
  and 
  has 
  two 
  sperm 
  receptacles, 
  dlfTerinp 
  from 
  all 
  

   other 
  known 
  males 
  (which 
  have 
  only 
  one). 
  The 
  ovary 
  Is 
  entirely 
  dilTerent 
  from 
  that 
  of 
  other 
  penera. 
  "The 
  

   mesenteric 
  strands 
  of 
  mu.sculnr 
  tl.ssue 
  which 
  nmlntain 
  the 
  iK)sterlor 
  portion 
  of 
  the 
  rectum 
  in 
  position 
  arc 
  very 
  

   well 
  dcvclopwl 
  and 
  form 
  the 
  basis 
  of 
  the 
  ovary 
  whilst 
  from 
  the 
  ix-ritoneum 
  llnlnp 
  them 
  the 
  ova 
  are 
  developed" 
  

   (p. 
  221). 
  "The 
  anal 
  pinnds 
  or 
  pf»sterior 
  nephridia 
  are 
  ropre,scnt/Ml 
  by 
  two 
  small, 
  tuft-like 
  masses 
  slliiate<l 
  one 
  

   on 
  each 
  side 
  of 
  the 
  posterior 
  end 
  of 
  Intestine. 
  Each 
  consists 
  of 
  n 
  mass 
  of 
  very 
  delicate, 
  simple, 
  cylindrical 
  

   tubosopenlnpseparately 
  Into 
  the 
  rectum, 
  whose 
  walls 
  In 
  thisreplon 
  are 
  thickened. 
  The 
  tubules 
  arc 
  approxl- 
  

   mat/'ly 
  clrailar 
  in 
  section 
  with 
  an 
  Irrepular 
  lumen. 
  They 
  consist 
  of 
  a 
  sinple 
  layer 
  of 
  epithelial 
  cells. 
  Near 
  Its 
  

   free 
  end 
  each 
  tubule 
  t)«comes 
  narrowed 
  before 
  o[K>ninR 
  Into 
  the 
  ooclom 
  by 
  a 
  sllphtly 
  dilated 
  funnel 
  fringed 
  

   with 
  long 
  cilia" 
  (p. 
  220). 
  

  

  This 
  species 
  was 
  collected 
  In 
  the 
  Capricorn 
  Group, 
  Oreat 
  Barrier 
  Uoef, 
  due 
  cast 
  from 
  Kcppol 
  Bay, 
  Qaoens- 
  

   land. 
  Subsequently 
  Monro 
  (1931, 
  p. 
  33) 
  reported 
  the 
  species 
  from 
  Low 
  Isloa. 
  

  

  