﻿PROCEEDIXQS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  The 
  surface 
  of 
  the 
  skin 
  is 
  smooth, 
  with 
  prominent 
  papillae 
  at 
  the 
  

   posterior 
  end 
  of 
  the 
  trunk. 
  Those 
  elsewhere 
  are 
  exccedmgly 
  small, 
  

   and 
  on 
  the 
  anterior 
  part 
  of 
  the 
  trunk 
  they 
  are 
  reduced 
  in 
  number 
  and 
  

   size 
  almost 
  to 
  the 
  vanishmg 
  pomt, 
  though 
  minute 
  papillae 
  similar 
  in 
  

   size 
  to 
  those 
  on 
  the 
  middle 
  zone 
  of 
  the 
  trunk 
  are 
  uniformly 
  distributed 
  

   over 
  the 
  introvert. 
  

  

  In 
  certain 
  preserved 
  specimens, 
  like 
  the 
  one 
  taken 
  at 
  station 
  2234, 
  

   local 
  contraction 
  of 
  the 
  integument 
  at 
  the 
  posterior 
  and 
  anterior 
  ends 
  

  

  of 
  the 
  trunk 
  produces 
  the 
  erroneous 
  im- 
  

   pression 
  of 
  permanent 
  shields, 
  as 
  in 
  

   Aspidosiplio7i. 
  

  

  The 
  two 
  retractor 
  muscles 
  (fig. 
  5) 
  are 
  

   attached 
  to 
  the 
  body 
  wall 
  not 
  far 
  from 
  

   the 
  middle 
  of 
  the 
  length 
  of 
  the 
  trunk, 
  

   but 
  there 
  appears 
  to 
  be 
  a 
  good 
  deal 
  of 
  

   variation 
  in 
  this 
  respect, 
  as 
  Theel 
  has 
  

   also 
  found. 
  They 
  are 
  joined 
  together 
  

   near 
  their 
  posterior 
  attachments 
  to 
  

   form 
  one. 
  In 
  one 
  of 
  the 
  two 
  specimens 
  

   dissected, 
  the 
  posterior 
  extremities 
  of 
  

   the 
  two 
  retractors 
  were 
  bound 
  together 
  

   by 
  a 
  transverse 
  muscular 
  cord. 
  

  

  The 
  long 
  esophagus 
  lies 
  dorsal 
  to 
  the 
  

   united 
  retractor 
  muscle, 
  and 
  passes 
  into 
  

   a 
  many-coiled 
  intestine 
  which 
  joins 
  a 
  

   short 
  rectum. 
  

  

  The 
  short, 
  cylindrical 
  nephridia 
  taper 
  

   slightly, 
  and 
  are 
  attached 
  to 
  the 
  body 
  

   immediately 
  beliind 
  the 
  zone 
  in 
  wliich 
  

   the 
  anus 
  lies. 
  

  

  So 
  far 
  as 
  I 
  have 
  exammed 
  these 
  few 
  

   specimens 
  I 
  have 
  found 
  none 
  with 
  eggs, 
  

   which 
  was 
  also 
  the 
  condition 
  which 
  

   Theel 
  found 
  in 
  the 
  Swedish 
  specimens, 
  

   and 
  wliich 
  led 
  liim 
  to 
  suppose 
  that 
  this 
  might 
  be 
  the 
  male 
  of 
  Ph. 
  

   sahellarise. 
  The 
  American 
  specunens 
  of 
  the 
  male 
  of 
  the 
  latter 
  species, 
  

   however, 
  as 
  I 
  have 
  already 
  stated, 
  are 
  smooth, 
  whitish 
  individuals 
  

   easily 
  distinguishable 
  from 
  tliis 
  papillate, 
  slightly 
  more 
  opaque 
  form. 
  

  

  PHASCOLOSOMA 
  CINEREUM, 
  new 
  species. 
  

  

  A 
  specimen 
  was 
  taken 
  from 
  south 
  of 
  Key 
  West 
  (station 
  2317), 
  

   lat. 
  24° 
  25' 
  45" 
  N.; 
  long. 
  81° 
  46' 
  45" 
  W., 
  at 
  a 
  depth 
  ofi45 
  fathoms 
  

   and 
  from 
  a 
  bottom 
  of 
  coral 
  sand 
  and 
  temperature 
  of 
  75° 
  F. 
  The 
  

   contracted 
  trunk 
  is 
  14 
  mm. 
  long, 
  7 
  mm. 
  tliick. 
  Introvert 
  very 
  short, 
  

   4 
  or 
  5 
  mm. 
  in 
  length. 
  

  

  Type.— 
  Csit. 
  No. 
  4087, 
  U.S.N.M. 
  

  

  Fig. 
  5.— 
  Dissection 
  of 
  Phascolosoma 
  

  

  IMPKOVISUM 
  from 
  OFF 
  NiANTIC 
  BAY, 
  

  

  Connecticut, 
  in 
  five 
  fathoms, 
  

   STATION 
  549. 
  Intestinal 
  coil 
  not 
  

   SHOWN. 
  X 
  13i. 
  an, 
  anus; 
  m. 
  rtr, 
  

   eetractor 
  muscle; 
  neph, 
  nephri- 
  

   dium; 
  n. 
  v, 
  ventral 
  nerve 
  cord; 
  a, 
  

   esophagus. 
  

  

  