﻿ECHIUROID 
  WORMS 
  OF 
  NORTH 
  PACIFIC 
  — 
  FISHER 
  243 
  

  

  tinted 
  by 
  texture. 
  The 
  gizzard 
  is 
  nmri-ced 
  by 
  eircular 
  lines, 
  the 
  stomach 
  

   by 
  longitudinal 
  representing 
  the 
  longitudinal 
  folds 
  of 
  the 
  lining. 
  

   Complicated 
  dorsal 
  and 
  ventral 
  mesenteries 
  attach 
  the 
  pharyiLX 
  and 
  

   esophagus 
  to 
  body 
  wall. 
  

  

  The 
  hitestine 
  is, 
  as 
  usual, 
  highly 
  convoluted 
  but 
  when 
  partly 
  un- 
  

   raveled 
  is 
  seen 
  to 
  have 
  a 
  principal 
  posterior 
  loop, 
  and 
  then 
  an 
  anterior. 
  

   The 
  siphon, 
  or 
  collateral 
  intestine, 
  begins 
  a 
  short 
  distance 
  behind 
  the 
  

   ring 
  blood 
  vessel, 
  its 
  course 
  being 
  shown 
  in 
  plate 
  23, 
  figure 
  1, 
  where 
  

   the 
  dotted 
  line 
  indicates 
  the 
  ciliated 
  groove, 
  which 
  terminates 
  at 
  the 
  

   coecum. 
  The 
  walls 
  of 
  the 
  cloaca 
  have 
  thick 
  longitudinal 
  folds. 
  The 
  

   anal 
  vesicles 
  empty 
  into 
  it 
  by 
  veiy 
  small 
  pores. 
  

  

  Blood-vascul.\r 
  system. 
  The 
  dorsal 
  vessel, 
  intestinal 
  ring 
  vessel, 
  

   doi-soventral 
  comiectives, 
  and 
  ventral 
  vessel 
  are 
  shown 
  in 
  plate 
  24. 
  

   The 
  ventral 
  vessel, 
  which 
  anteriorly 
  follows 
  a 
  part 
  of 
  the 
  free 
  edge 
  of 
  

   the 
  ventral 
  mesentery, 
  terminates 
  posteriorly 
  on 
  the 
  wall 
  of 
  the 
  

   coecum. 
  

  

  Color 
  in 
  life, 
  greenish; 
  in 
  alcohol 
  grayish 
  flesh 
  color 
  with 
  eight 
  dark 
  

   grayish 
  stripes. 
  

  

  fyi^f.— 
  U.S.N. 
  M. 
  No. 
  20607. 
  

  

  Type 
  locality. 
  — 
  Newport 
  Bay, 
  Orange 
  County, 
  Calif., 
  January- 
  

   Februarj^ 
  1930, 
  G. 
  E. 
  MacGinitie, 
  11 
  specimens. 
  

  

  Other 
  material 
  examined. 
  — 
  Cabrillo 
  Beach 
  (San 
  Pedro), 
  Calif., 
  1 
  

   specimen, 
  W. 
  R. 
  Lloyd, 
  Cabrillo 
  Beach 
  Marine 
  Museum. 
  

  

  Remarks. 
  — 
  Newport 
  Bay, 
  where 
  Professor 
  MacGinitie 
  collected 
  

   tho 
  tyi)e 
  series, 
  is 
  a 
  rather 
  small 
  tidal 
  inlet 
  south 
  of 
  Long 
  Beach. 
  

   The 
  worms 
  were 
  taken 
  from 
  a 
  sandy 
  bar, 
  exposed 
  at 
  low 
  tide, 
  where 
  

   they 
  inhabited 
  U-shaped 
  burrows, 
  the 
  mouths 
  of 
  which 
  were 
  12 
  to 
  14 
  

   inches 
  apart 
  and 
  the 
  bottom 
  10 
  to 
  12 
  inches 
  below 
  the 
  surface. 
  A 
  

   mutilated 
  specimen 
  was 
  dredged 
  in 
  25 
  fathoms. 
  

  

  This 
  sand 
  bar 
  was 
  later 
  removed 
  in 
  order 
  to 
  deepen 
  the 
  harbor, 
  and 
  

   tiie 
  species 
  was 
  apparently 
  wiped 
  out 
  at 
  that 
  locality 
  as 
  it 
  has 
  not 
  since 
  

   Incn 
  taken 
  in 
  spite 
  of 
  nmch 
  collecting. 
  

  

  Tlie 
  food 
  consists 
  of 
  very 
  fine 
  detritus, 
  which 
  in 
  (he 
  intestine 
  is 
  

   fornu'd 
  into 
  ellipsoidal 
  pellets 
  2 
  to 
  2.5 
  mm. 
  long 
  by 
  0.75 
  mm. 
  thick. 
  

  

  The 
  only 
  species 
  with 
  which 
  0. 
  octomyotum 
  might 
  be 
  confused 
  is 
  0. 
  

   formolosvm 
  (Lampert) 
  from 
  the 
  Pliilippincs 
  and 
  Shanghai. 
  This 
  is 
  a 
  

   small 
  form 
  averaging 
  30 
  mm. 
  in 
  length, 
  |)r()boscis 
  8 
  mm., 
  and 
  diameter 
  

   10 
  mm. 
  The 
  color 
  is 
  white 
  in 
  alcoholic 
  sjx'cimens, 
  the 
  skin 
  very 
  

   thin, 
  with 
  white 
  papillae 
  scattered 
  uniformly 
  all 
  over 
  the 
  body. 
  The 
  

   anal 
  vesicles 
  are 
  described 
  as 
  broad 
  saclike 
  organs. 
  The 
  species 
  has 
  

   seven 
  or 
  eight 
  muscle 
  jjundles, 
  two 
  pairs 
  of 
  nephridia 
  with 
  spirally 
  

   coiled 
  openings, 
  and 
  a 
  .spherical 
  diverticulum 
  on 
  the 
  rectum 
  — 
  charac- 
  

   tcri-.tics 
  of 
  odorinjotum, 
  except 
  the 
  nunil)(r 
  of 
  nmsclcs 
  which 
  is 
  con- 
  

   stantly 
  eight 
  in 
  the 
  California 
  si)ecies. 
  

  

  