﻿ECHIUROID 
  WORMS 
  OF 
  NORTH 
  PACIFIC 
  — 
  FISHER 
  247 
  

  

  In 
  the 
  list 
  of 
  species, 
  edax 
  is 
  next 
  to 
  bnronii, 
  wliich 
  has 
  17 
  to 
  19 
  

   nuiscle 
  banils 
  and 
  anal 
  glands 
  which 
  are 
  described 
  as 
  having 
  short 
  

   branching 
  outgrowths. 
  

  

  In 
  July 
  191S 
  I 
  collected 
  at 
  English 
  Harbor, 
  Antigua, 
  B. 
  W. 
  I., 
  a 
  

   small 
  Ochetostoma 
  that 
  has 
  19 
  muscle 
  bands, 
  2 
  pairs 
  of 
  nepliridia, 
  

   a 
  strong 
  interbasal 
  muscle 
  passing 
  tluough 
  a 
  loop 
  of 
  the 
  dorsoventral 
  

   blood 
  vessel. 
  The 
  anal 
  vesicles 
  are 
  long, 
  reaching 
  to 
  the 
  anterior 
  end 
  

   of 
  the 
  contracted 
  specimen 
  and 
  are 
  covered 
  with 
  ciliated 
  cups, 
  but 
  

   there 
  is 
  nothing 
  that 
  can 
  be 
  interpreted 
  as 
  branched 
  outgrowths. 
  The 
  

   proboscis 
  is 
  much 
  contracted, 
  fleshy, 
  and 
  very 
  adherent. 
  The 
  

   posterior 
  papillae 
  are 
  wliite, 
  conspicuous, 
  crowded, 
  so 
  that 
  they 
  are 
  in 
  

   contact, 
  and 
  are 
  hard 
  to 
  the 
  touch. 
  In 
  a 
  section 
  of 
  the 
  body 
  wall 
  they 
  

   resemble 
  calcareous 
  nodules. 
  This 
  posterior 
  part 
  of 
  the 
  body 
  is 
  

   perfectly 
  opaque 
  while 
  the 
  rest 
  is 
  slightly 
  translucent. 
  This 
  species 
  is 
  

   perfectly 
  distinct 
  from 
  edax, 
  and 
  it 
  is 
  noted 
  here 
  because 
  outwardly 
  it 
  

   would 
  pass 
  for 
  0. 
  baronii. 
  The 
  specimen 
  is 
  a 
  mature 
  female 
  with 
  the 
  

   four 
  nepliridia 
  enlarged 
  and 
  full 
  of 
  eggs. 
  Length 
  of 
  body, 
  much 
  

   contracted, 
  20 
  mm.; 
  thickness, 
  9 
  mm.; 
  proboscis, 
  8 
  mm. 
  

  

  Genus 
  ARHYNCHITE 
  Sato 
  

  

  Arhynchite 
  Sato, 
  1937, 
  p. 
  142. 
  (Type, 
  Thalassema 
  arhynchite 
  Ikeda.) 
  

  

  Diagnosis. 
  — 
  Differing 
  from 
  Thalassema 
  in 
  absence 
  of 
  a 
  proboscis; 
  

   nephridia 
  2, 
  with 
  spiral 
  lobes 
  to 
  nephrostome; 
  no 
  intestinal 
  coecum; 
  

   no 
  ring 
  vessel 
  around 
  foregut 
  at 
  end 
  of 
  dorsal 
  vessel, 
  the 
  connection 
  

   between 
  dorsal 
  vessel 
  and 
  neurointestinal 
  connective 
  being 
  indirect 
  

   as 
  in 
  Bonellia; 
  muscles 
  of 
  body 
  wall 
  smooth 
  with 
  no 
  concentration 
  of 
  

   fibers 
  in 
  either 
  the 
  middle, 
  longitudinal 
  layer 
  or 
  in 
  the 
  inner, 
  oblique 
  

   layer. 
  

  

  ABHYNCMITE 
  INAMOENUS. 
  new 
  spcciea 
  

  

  Platk 
  25 
  

  

  Diagnosis. 
  — 
  Differing 
  from 
  A. 
  arhynchite 
  (Ikeda) 
  in 
  having 
  a 
  

   relatively 
  longer 
  neurointestinal 
  blood 
  vessel, 
  which 
  does 
  not 
  embrace 
  

   the 
  interbasal 
  muscle. 
  Intestine 
  vciy 
  long, 
  especially 
  presiphonal 
  

   segment; 
  dorsal 
  blood 
  ves.^el 
  slender, 
  not 
  connecting 
  directly 
  with 
  

   neurointestinal 
  vessel, 
  which 
  is 
  relatively 
  long 
  and 
  divided 
  into 
  two 
  

   before 
  joining 
  ventral 
  vessel; 
  size 
  medium; 
  skin 
  with 
  low 
  papillae. 
  

  

  Description. 
  — 
  Length 
  of 
  type, 
  much 
  contracted, 
  70 
  mm.; 
  diameter 
  

   25 
  mm. 
  Skin 
  roughened 
  by 
  low, 
  close-set, 
  pustulate 
  verrucae 
  largest 
  

   and 
  most 
  irregular 
  at 
  QWiX^ 
  of 
  body. 
  Setae 
  2, 
  close 
  to 
  the 
  much 
  

   contracted 
  anterior 
  end; 
  11 
  mm. 
  long, 
  the 
  inner 
  ends 
  united 
  b}^ 
  an 
  

   interbasal 
  muscle 
  which 
  docs 
  not 
  pass 
  through 
  loop 
  of 
  neurointestinal 
  

   vessel, 
  

  

  Coelomic 
  surface 
  of 
  body 
  widl 
  perfectly 
  smooth 
  and 
  with 
  satiny 
  

   sheen, 
  the 
  muscles 
  continuous, 
  without 
  trace 
  of 
  difTerentiation 
  into 
  

   670329 
  — 
  1<; 
  :; 
  

  

  