﻿256 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  description 
  and 
  figure, 
  apparently 
  not 
  realizing 
  that 
  it 
  is 
  different 
  

   from 
  the 
  relations 
  of 
  the 
  two 
  vessels 
  in 
  Bonellia. 
  Neither 
  his 
  figure 
  

   nor 
  description 
  gives 
  any 
  definite 
  details 
  concerning 
  the 
  foregut 
  

   beyond 
  the 
  fact 
  that 
  it 
  is 
  very 
  long. 
  

  

  EUBONELLIA 
  VALIDA. 
  new 
  species 
  

  

  Plate 
  28 
  

  

  Description. 
  — 
  The 
  much-contracted 
  type 
  is 
  oblong-cylindrical, 
  55 
  

   mm. 
  long, 
  and 
  about 
  20 
  mm. 
  thick 
  at 
  middle. 
  The 
  conspicuous 
  

   nephridiopore 
  is 
  8 
  mm. 
  behind 
  mouth. 
  Proboscis 
  unusually 
  broad 
  

   and 
  flat, 
  terminally 
  bifurcate, 
  without 
  a 
  ventral 
  sulcus. 
  In 
  its 
  con- 
  

   tracted 
  state 
  it 
  is 
  30 
  mm. 
  long 
  and 
  7-9 
  mm. 
  broad 
  (pi. 
  28, 
  fig. 
  3). 
  

   The 
  thick 
  skin 
  is 
  thrown 
  into 
  annular 
  welts, 
  the 
  furrows 
  being 
  fre- 
  

   quently 
  interrupted. 
  These 
  folds 
  do 
  not 
  carry 
  marked 
  pustulate 
  

   thickenings 
  as 
  in 
  the 
  case 
  of 
  Nellobia 
  found 
  at 
  the 
  same 
  station. 
  

   From 
  the 
  mouth 
  a 
  short 
  narrow 
  sulcus 
  extends 
  upon 
  the 
  constricted 
  

   base 
  of 
  proboscis. 
  

  

  Body 
  wall 
  tough 
  and 
  muscular, 
  1.5 
  to 
  2.5 
  mm. 
  thick, 
  the 
  middle 
  

   longitudinal 
  layer 
  being 
  the 
  thickest. 
  The 
  inner, 
  circular 
  layer 
  is 
  

   smooth, 
  but 
  somewhat 
  fasciculated 
  at 
  anterior 
  end 
  of 
  body. 
  

  

  No 
  setae 
  or 
  vestiges 
  of 
  seta 
  sacs 
  or 
  muscles. 
  

  

  The 
  single 
  large 
  (right) 
  nepln-idium 
  has 
  a 
  terminal 
  large 
  nephrostome 
  

   with 
  voluminous 
  lips. 
  At 
  the 
  base 
  a 
  simple 
  duct 
  leads 
  to 
  the 
  exterior 
  

   approximately 
  in 
  the 
  median 
  line. 
  

  

  The 
  two 
  anal 
  vesicles 
  are 
  of 
  the 
  elongate 
  dendritic 
  type 
  with 
  a 
  

   voluminous 
  axial 
  bladder 
  having 
  a 
  few 
  branches 
  proximally. 
  To 
  the 
  

   main 
  stem 
  and 
  branches 
  are 
  attached 
  singly 
  or 
  in 
  clusters 
  (pi. 
  28, 
  

   fig. 
  2) 
  the 
  nephritic 
  elements, 
  which 
  are 
  characteristically 
  very 
  elongate, 
  

   ending 
  in 
  pedunculate 
  funnels. 
  The 
  vesicles 
  are 
  attached 
  to 
  each 
  side 
  

   of 
  a 
  very 
  small 
  cloacal 
  bulb, 
  the 
  mucosa 
  of 
  which 
  is 
  thrown 
  into 
  longi- 
  

   tudinal 
  ridges. 
  

  

  Alimentary 
  canal. 
  The 
  anterior 
  part 
  of 
  pharynx 
  is 
  attached 
  to 
  

   body 
  wall 
  by 
  numerous 
  frenula, 
  but 
  there 
  is 
  no 
  peripharyngeal 
  dia- 
  

   phragm 
  such 
  as 
  is 
  characteristic 
  of 
  Nellobia. 
  There 
  is 
  a 
  rather 
  delicate 
  

   mesentery 
  at 
  the 
  bend 
  of 
  the 
  esophagus 
  (not 
  shown 
  in 
  figure). 
  Food 
  

   pellets 
  form 
  in 
  the 
  posterior 
  part 
  of 
  esophagus 
  (0^), 
  as 
  well 
  as 
  in 
  the 
  

   gizzard 
  (60, 
  and 
  are 
  collected 
  in 
  the 
  elongate 
  stomach. 
  The 
  wall 
  of 
  

   the 
  stomach 
  is 
  almost 
  transparent. 
  Between 
  it 
  and 
  the 
  gizzard 
  there 
  

   is 
  a 
  powerful 
  sphincter 
  forming 
  a 
  sort 
  of 
  pylorus 
  as 
  in 
  Bonelliopsis. 
  

   There 
  is 
  a 
  weaker 
  sphincter 
  between 
  the 
  esophagus 
  and 
  gizzard. 
  

  

  There 
  is 
  no 
  presiphonal 
  ciliated 
  groove. 
  Much 
  of 
  the 
  intestine 
  is 
  

   missing, 
  but 
  enough 
  remains 
  to 
  show 
  that 
  there 
  is 
  an 
  extensive 
  por- 
  

   tion, 
  traversed 
  by 
  the 
  siphon, 
  which 
  has 
  thicker 
  walls 
  so 
  that 
  the 
  

   pellets 
  are 
  not 
  visible, 
  whereas 
  the 
  postsiphonal 
  intestine 
  (with 
  a 
  

  

  