﻿NO. 
  1959. 
  8IPUNCVLIDS 
  OF 
  EASTERN 
  NORTH 
  AMERICA— 
  OEROVLD. 
  393 
  

  

  Theel's 
  description 
  the 
  total 
  length 
  of 
  the 
  largest 
  specimen 
  (expanded) 
  

   is 
  15 
  mm., 
  proboscis 
  more 
  than 
  one-third 
  of 
  the 
  total 
  length. 
  The 
  

   introvert 
  is 
  slender 
  and 
  cylindrical, 
  and 
  is 
  marked 
  off 
  from 
  the 
  trunk 
  

   in 
  certain 
  of 
  the 
  American 
  specimens 
  by 
  a 
  slight 
  dorsal 
  hump 
  on 
  

   which 
  the 
  anus 
  is 
  situated, 
  or 
  by 
  an 
  annular 
  elevation 
  about 
  that 
  

   region, 
  though 
  some 
  specimens 
  do 
  not 
  show 
  these 
  features. 
  The 
  

   skin 
  is 
  smooth, 
  except 
  that 
  a 
  few 
  minute 
  epidermal 
  organs 
  are 
  found 
  

   at 
  the 
  base 
  of 
  the 
  introvert 
  and 
  at 
  the 
  posterior 
  extremity 
  of 
  the 
  trunk 
  

   (fig. 
  3) 
  . 
  The 
  epidermal 
  organs 
  consist 
  of 
  a 
  crater-like 
  ring 
  of 
  four 
  or 
  

   five 
  cells 
  rising 
  slightly 
  above 
  the 
  surface, 
  surrounding 
  a 
  minute, 
  

  

  Fig. 
  3.— 
  Posterior 
  extremity 
  of 
  

   Phascolosoma 
  sabellari^ 
  

  

  SHOVriNG 
  PAPILLiE. 
  

  

  Fig. 
  4.— 
  Dissection 
  of 
  Phascolosoma 
  sabellarijE. 
  x 
  13J. 
  

   anus; 
  go, 
  REPRODUCTrv'E 
  organ; 
  nph, 
  nephridium. 
  

  

  slender, 
  transparent 
  cuticular 
  elevation. 
  The 
  bod}^ 
  wall 
  is 
  thin 
  and 
  

   transparent. 
  

  

  Theel 
  states 
  that 
  the 
  tentacles 
  are 
  represented 
  by 
  irregular, 
  rounded 
  

   prominences 
  of 
  the 
  oral 
  disk, 
  and 
  that 
  hooks 
  are 
  absent, 
  though 
  he 
  

   found 
  in 
  rare 
  cases 
  (1 
  per 
  cent) 
  a 
  few 
  small 
  ones. 
  

  

  The 
  two 
  ventral 
  retractor 
  muscles 
  (fig. 
  4) 
  are 
  attached 
  slightly 
  

   behind 
  the 
  middle 
  of 
  the 
  trunk, 
  the 
  pair 
  of 
  nephridia 
  suspended 
  

   nearly 
  opposite 
  the 
  anus. 
  They 
  hang 
  free, 
  and 
  are 
  easily 
  broken 
  off 
  

   in 
  dissection. 
  There 
  are 
  no 
  eye 
  spots. 
  The 
  nerve 
  cord 
  terminates 
  

   slightly 
  in 
  front 
  of 
  the 
  posterior 
  end 
  of 
  the 
  body, 
  and 
  a 
  pair 
  of 
  nerves 
  

   runs 
  backward 
  between 
  the 
  circular 
  and 
  longitudinal 
  muscles. 
  

  

  