﻿ECHIUROID 
  WORMS 
  OF 
  NORTH 
  PACIFIC 
  — 
  FISHER 
  227 
  

  

  is 
  the 
  voluminous 
  dorsal 
  blood 
  vess(>l 
  with 
  numerous 
  papilliform 
  

   l)ranchos, 
  at 
  least 
  anteriorly. 
  

  

  A 
  very 
  short 
  rudimentary 
  stomach 
  or 
  crop 
  lies 
  between 
  the 
  gizzard 
  

   and 
  liesritming 
  of 
  intestine 
  (indicated 
  by 
  the 
  ventral 
  ciliated 
  p-oove). 
  

   The 
  lining 
  of 
  stomach 
  is 
  thrown 
  into 
  12 
  strong 
  longitudinal 
  folds, 
  

   contrasting 
  sharply 
  with 
  the 
  annular 
  folds 
  of 
  gizzard. 
  Where 
  tiie 
  

   stomach 
  becomes 
  intestine, 
  the 
  dorsal 
  blood 
  vessel 
  splits 
  to 
  form 
  tiie 
  

   ring 
  vessel. 
  

  

  The 
  intestine 
  has 
  the 
  usual 
  three 
  parts: 
  presiphonal, 
  siphonal, 
  and 
  

   postsiphonal. 
  The 
  first 
  is 
  about 
  as 
  long 
  as 
  the 
  gizzard, 
  or 
  a 
  little 
  

   longer 
  if 
  relaxed. 
  

  

  The 
  siphonal 
  part, 
  rougldy 
  20 
  to 
  25 
  times 
  length 
  of 
  presiphonal 
  part, 
  

   is 
  marked 
  by 
  longitudinal 
  folds 
  of 
  the 
  lining 
  which 
  arc 
  evident 
  super- 
  

   ficially. 
  The 
  siphon 
  is 
  about 
  one-fourth 
  the 
  diameter 
  of 
  the 
  intestines. 
  

  

  The 
  postsiphonal 
  intestine 
  has 
  thinner 
  walls 
  and 
  is 
  about 
  10 
  times 
  

   the 
  length 
  of 
  presiphonal 
  segment. 
  The 
  ciliated 
  groove 
  forms 
  a 
  

   ridge 
  along 
  its 
  ventral 
  side, 
  and 
  ends 
  at 
  a 
  coecum 
  (not 
  always 
  inflated) 
  

   just 
  in 
  front 
  of 
  the 
  cloaca. 
  The 
  fecal 
  pellets 
  which 
  fill 
  this 
  part 
  of 
  the 
  

   intestine 
  are 
  elongate 
  ellipsoids 
  and 
  sometimes 
  contain 
  coarse 
  material. 
  

   I 
  have 
  found 
  leaves 
  of 
  the 
  hemlock 
  (Tsuga). 
  

  

  Vascular 
  system. 
  This 
  consists 
  of 
  a 
  dorsal 
  and 
  ventral 
  blood 
  

   vessel 
  and 
  neurointestinal 
  connective. 
  These 
  vary 
  in 
  caliber 
  in 
  dif- 
  

   ferent 
  specimens. 
  The 
  dorsal 
  vessel 
  is 
  likely 
  to 
  be 
  considerably 
  in- 
  

   flated 
  over 
  part 
  or 
  the 
  entire 
  length 
  of 
  gizzard, 
  vnih 
  irregular 
  lobose 
  

   swellings 
  anteriorly. 
  The 
  ventral 
  vessel, 
  attached 
  to 
  middorsal 
  line 
  

   of 
  nerve 
  cord, 
  ends 
  posteriorly 
  as 
  a 
  solid 
  cord 
  just 
  in 
  front 
  of 
  the 
  in- 
  

   testinal 
  coecum. 
  The 
  neurointestinal 
  connective 
  results 
  from 
  the 
  

   brandling 
  of 
  the 
  dorsal 
  vessel 
  at 
  the 
  beginning 
  of 
  intestine 
  by 
  which 
  

   tlie 
  neurointestinal 
  ring 
  (B^) 
  is 
  formed. 
  The 
  connective 
  branches 
  

   again 
  (5^), 
  to 
  form 
  the 
  muscle 
  ring, 
  before 
  merging 
  broadly 
  with 
  

   the 
  ventral 
  vessel 
  (B*). 
  

  

  Type.— 
  v. 
  S.N 
  M. 
  No. 
  20G09. 
  

  

  Type 
  locality. 
  — 
  Auk 
  Bay, 
  Juneau, 
  Alaska, 
  collected 
  by 
  E. 
  F. 
  Rick- 
  

   etts, 
  August 
  14, 
  19:n. 
  

  

  Specimens 
  examined. 
  — 
  One 
  hundred 
  and 
  twenty 
  -four 
  as 
  follows: 
  

  

  Collection 
  of 
  Stanford 
  Univkk.sity 
  • 
  

  

  Kiikak 
  Bay, 
  Shelikof 
  Strait, 
  Alaska, 
  12 
  apccimcns, 
  uruicr 
  rocks, 
  in 
  iimd; 
  McMillan, 
  

  

  1924. 
  

   \\ 
  rangell, 
  Ala.ska, 
  37 
  .si)ccimen.s; 
  A. 
  \V. 
  Greely 
  and 
  R. 
  K. 
  Sno(lnra.ss, 
  1897. 
  

   Auk 
  Bay, 
  near 
  Juneau, 
  Ala.ska, 
  3 
  specimens, 
  slate 
  beach, 
  under 
  rocks, 
  in 
  murldy 
  

  

  .sand, 
  lowest 
  intertidal 
  zone, 
  July 
  17, 
  1931; 
  K. 
  V. 
  Hickclts 
  (also 
  typo 
  from 
  

  

  this 
  locality, 
  August 
  14, 
  1931). 
  

   Huston 
  Inlet, 
  Queen 
  Charlotte 
  Islands, 
  Briti.sh 
  ('(jlunihia, 
  42 
  specimen.^; 
  W. 
  F. 
  

  

  Thornp.son, 
  July 
  1, 
  1913. 
  

   Alaska, 
  pos.sibly 
  Dutch 
  Harbor, 
  t'nalaska, 
  5 
  specimens. 
  

  

  