﻿PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  vol. 
  67 
  

  

  tentacle 
  is 
  slightly 
  constricted 
  at 
  the 
  base 
  and 
  divided 
  by 
  a 
  con- 
  

   striction 
  into 
  a 
  proximal 
  and 
  a 
  distal 
  portion, 
  of 
  which 
  the 
  former 
  

   is 
  the 
  larger. 
  The 
  style 
  is 
  slender 
  and 
  is 
  about 
  one 
  and 
  one-half 
  

   times 
  the 
  length 
  of 
  the 
  prostomium. 
  The 
  facial 
  caruncle 
  is 
  very 
  

   large 
  and 
  the 
  palps 
  are 
  unusually 
  well 
  developed. 
  

  

  The 
  first 
  parapodium 
  lies 
  close 
  to 
  the 
  prostomium 
  and 
  is 
  about 
  

   equal 
  to 
  it 
  in 
  length. 
  The 
  notopodium 
  is 
  larger 
  than 
  the 
  neuro- 
  

   podium 
  and 
  irregularly 
  lobed. 
  A 
  slender 
  dorsal 
  cirrus 
  arises 
  from 
  

   a 
  heavy 
  cirrophore 
  situated 
  a 
  little 
  below 
  the 
  dorsal 
  margin. 
  The 
  

   neuropodium 
  is 
  two-lobed 
  and 
  carries 
  a 
  cirrus 
  similar 
  in 
  form 
  to 
  the 
  

   dorsal 
  one 
  with 
  its 
  cirrophore 
  on 
  the 
  posterior 
  face 
  of 
  the 
  neuro- 
  

   podium. 
  A 
  single 
  acicula 
  comes 
  to 
  the 
  surface 
  between 
  the 
  two 
  

   lobes. 
  The 
  second 
  parapodium 
  is 
  markedly 
  different 
  from 
  the 
  first 
  

  

  Figs. 
  1 
  and 
  2. 
  — 
  1, 
  Anterior 
  end 
  X7.5. 
  The 
  large 
  facial 
  iubercle 
  is 
  shown 
  under 
  

  

  THE 
  MEDIAN 
  TENTACLE. 
  2, 
  FOURTH 
  PARAPODIUM 
  X 
  2. 
  THE 
  ELYTRON 
  IS 
  BENT 
  SO 
  AS 
  TO 
  

   LIB 
  PARALLEL 
  WITH 
  THE 
  VERTICAL 
  FACE 
  OF 
  THE 
  PARAPODIUM 
  

  

  and 
  the 
  two 
  lobes 
  are 
  sharply 
  separated 
  from 
  one 
  another. 
  The 
  

   neuropodium 
  is 
  long 
  and 
  cylindrical, 
  obliquely 
  truncated 
  at 
  the 
  end, 
  

   and 
  has 
  a 
  few 
  dark-brown 
  setae. 
  The 
  notopodium 
  expands 
  distally 
  

   from 
  a 
  narrow 
  base 
  and 
  carries 
  the 
  large 
  milk-white 
  smooth 
  elytron. 
  

   In 
  the 
  notopodium 
  are 
  a 
  few 
  of 
  the 
  dark-brown 
  setae 
  which 
  extend 
  

   dorsally 
  through 
  the 
  felt, 
  and 
  a 
  few 
  slender 
  ones. 
  

  

  The 
  fourth 
  parapodium 
  (fig. 
  2) 
  has 
  a 
  long 
  cylindrical 
  notopodium 
  

   like 
  the 
  second 
  but 
  longer. 
  A 
  slender 
  ventral 
  cirrus 
  arises 
  from 
  a 
  

   heavy 
  cirrophore. 
  The 
  rounded 
  notocirrus 
  has 
  at 
  the 
  apex 
  a 
  tuft 
  

   of 
  the 
  slender 
  setae 
  and 
  dorsally 
  some 
  of 
  the 
  heavy 
  brown 
  ones. 
  The 
  

   elytron 
  (foreshortened 
  in 
  the 
  drawing) 
  is 
  smooth, 
  nearly 
  circular 
  in 
  

   outline, 
  and 
  rather 
  delicate. 
  Later 
  somites 
  show 
  an 
  increase 
  in 
  the 
  

   length 
  of 
  the 
  parapodia, 
  followed 
  by 
  a 
  gradual 
  decrease 
  toward 
  the 
  

   posterior 
  end 
  of 
  the 
  body. 
  There 
  are 
  15 
  pairs 
  of 
  elytra. 
  

  

  