﻿ECHIUROID 
  WORMS 
  OF 
  NORTH 
  PACIFIC 
  — 
  FISHER 
  289 
  

  

  3, 
  Teruiinal 
  portion 
  of 
  intestine, 
  the 
  cloaca, 
  anus, 
  and 
  anal 
  vesicles, 
  X 
  5. 
  

  

  4, 
  Branchlot 
  of 
  anal 
  vesicle, 
  X 
  50. 
  

  

  NP, 
  nephridiopore; 
  Go, 
  posterior 
  part 
  of 
  gonad 
  with 
  blood 
  vessel 
  and 
  nerve 
  cord 
  

   underneath; 
  M, 
  mesenteries; 
  other 
  lettering 
  as 
  for 
  plate 
  24. 
  

  

  Plate 
  30 
  

  

  Nellobia 
  euaoma, 
  new 
  genus 
  and 
  species 
  

  

  1, 
  Dissection 
  of 
  anterior 
  portion 
  of 
  type, 
  seen 
  from 
  above, 
  X 
  5. 
  The 
  nephridium, 
  

  

  filled 
  with 
  eggs 
  (0.85 
  mm. 
  in 
  diameter) 
  on 
  the 
  left, 
  has 
  a 
  window 
  cut 
  in 
  the 
  

   wall 
  to 
  show 
  the 
  constricted 
  duct 
  from 
  the 
  egg 
  chamber. 
  The 
  swollen 
  duct 
  

   leading 
  to 
  external 
  opening 
  lies 
  under 
  the 
  nerve 
  cord 
  and 
  ventral 
  blood 
  

   vessel. 
  

  

  2, 
  Pharynx, 
  X 
  5. 
  Interior; 
  anterior 
  end 
  looking 
  toward 
  mouth. 
  The 
  dorsal 
  side 
  

  

  has 
  been 
  cut 
  open. 
  

   B\ 
  B*, 
  B*, 
  dorsal, 
  neurointestinal, 
  and 
  ventral 
  blood 
  vessels, 
  respectively; 
  CF, 
  

   nephrostome; 
  D, 
  peripheral 
  portion 
  of 
  peripharyngeal 
  diaphragm 
  (the 
  central 
  

   portion 
  adjacent 
  to 
  pharynx 
  has 
  been 
  removed); 
  DAI, 
  dorsal 
  mesenteries; 
  

   G, 
  gizzard; 
  Go, 
  gonad; 
  M, 
  mesenterial 
  sheet 
  holding 
  loop 
  of 
  pharynx-esopha- 
  

   gus; 
  NC, 
  nerve 
  cord; 
  O, 
  esophagus; 
  Sil, 
  beginning 
  of 
  siphon; 
  VM, 
  ventral 
  

   mesentery 
  of 
  pharynx-esophagus; 
  X-Y, 
  probable 
  extent 
  of 
  gizzard; 
  at 
  Y 
  

   the 
  canal 
  was 
  broken, 
  and 
  it 
  is 
  possible 
  that 
  a 
  portion 
  of 
  the 
  succeeding 
  

   stomach 
  was 
  lost. 
  

  

  Plate 
  31 
  

  

  Acanthohamingia 
  paradola, 
  new 
  species 
  

  

  1, 
  Ventral 
  aspect 
  of 
  paratype, 
  X 
  1. 
  

  

  2, 
  Same 
  specimen; 
  genital 
  groove, 
  extending 
  forward 
  from 
  nci)hridiopore 
  (AO 
  

  

  and 
  showing 
  four 
  males 
  in 
  situ, 
  X 
  5 
  ( 
  $ 
  , 
  males 
  attached 
  to 
  skin). 
  

   2a, 
  Anterior 
  portion 
  of 
  figure 
  2, 
  X 
  15. 
  

  

  3, 
  Type; 
  genital 
  groove 
  in 
  probably 
  the 
  normal 
  closed 
  state, 
  X 
  5. 
  

  

  4, 
  Genital 
  groove 
  of 
  third 
  specimen 
  that 
  has 
  two 
  nephridiopores 
  {N), 
  X 
  5. 
  

   4a, 
  Nephridiopores 
  of 
  above, 
  enlarged. 
  

  

  5, 
  Male 
  from 
  genital 
  groove 
  of 
  paratype 
  (fig. 
  2), 
  1.19 
  mm. 
  long, 
  X 
  50. 
  

  

  6, 
  Tyj)e; 
  anal 
  vesicles 
  and 
  thin-walled 
  cloaca 
  from 
  above, 
  X 
  3. 
  The 
  anus 
  can 
  be 
  

  

  seen 
  through 
  the 
  thin 
  wall 
  of 
  the 
  cloaca, 
  and 
  on 
  the 
  left 
  most 
  of 
  tlie 
  tubes 
  

   spring 
  from 
  a 
  rudimentary 
  bladder. 
  

   I, 
  intestine 
  Cmi.ssing 
  from 
  type); 
  M, 
  mouth; 
  A'^, 
  nephridiopore; 
  S, 
  spermotheca 
  

   (nephridium). 
  

  

  Plate 
  32 
  

  

  Acanthohamingia 
  paradola, 
  new 
  species 
  

  

  Dissection 
  of 
  anterior 
  part 
  of 
  animal 
  from 
  above, 
  X 
  4. 
  Note 
  the 
  very 
  long 
  forogut 
  

   ending 
  at 
  B^ 
  and 
  the 
  long 
  (as 
  compared 
  with 
  Bonellia) 
  segment 
  of 
  intestine 
  

   between 
  B^ 
  and 
  Sil. 
  

  

  B\ 
  B*, 
  B*, 
  dorsal, 
  neurointestinal, 
  and 
  ventral 
  blood 
  vcssel.s, 
  respectively; 
  C, 
  

   portion 
  corresponding 
  to 
  stornarli 
  of 
  other 
  bonelliids; 
  CF, 
  nephrostome; 
  G, 
  

   probable 
  gizzard; 
  /, 
  intestine; 
  A^, 
  ncphridia; 
  NC, 
  nerve 
  cord; 
  0, 
  esophagus; 
  

   P, 
  pharynx, 
  Pe, 
  pellet, 
  X 
  10; 
  Si, 
  siphon; 
  Sit, 
  anterior 
  end 
  of 
  siphon. 
  

  

  