﻿NO. 
  1959. 
  SIPUNCULIDS 
  OF 
  EASTERN 
  NORTH 
  AMERICA— 
  GEROULD. 
  397 
  

  

  Color 
  ashen 
  gray; 
  introvert 
  of 
  a 
  lighter 
  shade; 
  trunk 
  covered 
  with 
  

   minute 
  brown 
  papillge, 
  which 
  at 
  the 
  posterior 
  end 
  of 
  the 
  body 
  are 
  

   long 
  and 
  finger-shaped, 
  ovate 
  with 
  a 
  slender 
  

   stalk 
  (fungiform) 
  in 
  the 
  middle 
  of 
  the 
  trunk, 
  

   and 
  bluntly 
  conical 
  at 
  the 
  anterior 
  extremity. 
  

   Those 
  of 
  the 
  introvert 
  are 
  much 
  finer 
  and 
  cylin- 
  

   drical. 
  A 
  narrow 
  zone 
  of 
  minute, 
  dark-colored, 
  

   irregularly 
  placed 
  hooks 
  (fig. 
  6) 
  lies 
  immediately 
  

   behind 
  the 
  tentacles. 
  Body 
  wall 
  tough 
  and 
  

   opaque. 
  The 
  cuticula, 
  which 
  resembles 
  that 
  of 
  

   Ph. 
  procerum, 
  is 
  thrown 
  up 
  into 
  sinuous 
  longi- 
  

   tudinal 
  folds 
  near 
  the 
  posterior 
  end 
  of 
  the 
  trunk. 
  

  

  The 
  inner 
  surface 
  of 
  the 
  body 
  wall 
  is 
  smooth 
  

   and 
  lustrous, 
  of 
  a 
  violet-brown 
  color. 
  A 
  single 
  

   pair 
  of 
  strong, 
  completely 
  separate 
  ventral 
  

   retractor 
  muscles 
  (fig. 
  7) 
  are 
  attached 
  to 
  about 
  no. 
  6.-hooks 
  from 
  in- 
  

   the 
  middle 
  of 
  the 
  trunk. 
  The 
  pair 
  of 
  nephridia 
  trovert 
  of 
  phasco- 
  

   hang 
  free 
  from 
  the 
  body 
  waU 
  opposite 
  the 
  ^o^^o^^a 
  cinereum. 
  x 
  

   anus. 
  The 
  contractile 
  tube 
  is 
  without 
  caeca. 
  The 
  

   esophagus 
  is 
  held 
  by 
  fine 
  muscle 
  strands 
  to 
  the 
  retractors. 
  There 
  

   are 
  about 
  15 
  whorls 
  in 
  the 
  intestinal 
  coil, 
  which 
  is 
  held 
  by 
  a 
  muscle 
  

  

  Fig. 
  7.— 
  Dissection 
  of 
  Phascolosoma 
  cmEREtna. 
  X 
  SJ. 
  an, 
  anus; 
  go, 
  reproductive 
  organs; 
  

   m. 
  Ttr, 
  retractor; 
  neph, 
  NEPHEmnra; 
  tb. 
  Pol, 
  Polian 
  tubule. 
  

  

  strand 
  on 
  each 
  side 
  of 
  the 
  first 
  turn, 
  but 
  free 
  behind. 
  The 
  rectum 
  

   is 
  short. 
  There 
  are 
  no 
  eye-spots. 
  

  

  