﻿248 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  9« 
  

  

  longitudinal 
  or 
  oblique 
  bands. 
  Where 
  the 
  seta 
  muscles 
  join 
  body 
  waU 
  

   there 
  are 
  a 
  few 
  transverse 
  thickenings 
  of 
  inner 
  layer. 
  

  

  Nephridia 
  2, 
  inserted 
  close 
  to 
  nerve 
  and 
  posterior 
  to 
  seta 
  about 
  

   the 
  length 
  of 
  latter. 
  In 
  the 
  only 
  female 
  dissected 
  these 
  nephridia 
  

   are 
  four-fifths 
  length 
  of 
  body 
  and 
  contain 
  numerous 
  eggs. 
  In 
  the 
  

   male 
  they 
  are 
  about 
  one-fifth 
  length 
  of 
  body 
  and 
  contain 
  sperm. 
  

   The 
  internal 
  opening 
  (nephrostome) 
  is 
  on 
  a 
  short 
  peduncle 
  near 
  base, 
  

   with 
  an 
  irregular 
  small 
  lip 
  lacking 
  any 
  trace 
  of 
  spiral 
  structure. 
  

  

  Anal 
  vesicles 
  2, 
  simple, 
  thin-walled, 
  opening 
  into 
  small 
  cloaca 
  hav- 
  

   ing 
  longitudinally 
  pKcate 
  walls. 
  Minute 
  ciliated 
  funnels 
  are 
  scattered 
  

   over 
  the 
  surface. 
  

  

  Alimentaiy 
  canal 
  excessively 
  long 
  (600 
  mm.) 
  with 
  very 
  numerous 
  

   coils 
  attached 
  to 
  body 
  wall 
  by 
  a 
  multitude 
  of 
  very 
  delicate 
  frenula 
  

   in 
  which 
  is 
  entangled 
  coagulum 
  containing 
  numerous 
  eggs 
  and 
  brown 
  

   bodies 
  of 
  unknown 
  nature. 
  The 
  pharynx-esophagus 
  is 
  thin-walled. 
  

   Plate 
  25, 
  figure 
  3, 
  shows 
  the 
  anterior 
  complex 
  more 
  or 
  less 
  in 
  situ 
  

   and 
  figure 
  4 
  with 
  the 
  interbasal 
  setae 
  muscle 
  cut 
  and 
  the 
  pharynx- 
  

   esophagus 
  pulled 
  to 
  right. 
  The 
  gizzard 
  is 
  about 
  6 
  mm. 
  long, 
  but 
  the 
  

   length 
  of 
  the 
  stomach 
  cannot 
  be 
  determined 
  on 
  account 
  of 
  condition 
  

   of 
  material. 
  The 
  interval 
  between 
  gizzard 
  and 
  beginning 
  of 
  siphon 
  

   is 
  the 
  astonishing 
  distance 
  of 
  170 
  mm. 
  The 
  siphon 
  accompanies 
  the 
  

   following 
  240 
  mm. 
  of 
  intestine, 
  while 
  the 
  terminal, 
  postsiphonal 
  por- 
  

   tion 
  is 
  190 
  mm. 
  There 
  is 
  no 
  intestinal 
  coecum 
  in 
  front 
  of 
  the 
  cloaca. 
  

  

  Vascular 
  system. 
  The 
  dorsal 
  vessel 
  can 
  be 
  traced 
  posteriorly 
  

   nearly 
  to 
  the 
  point 
  where 
  the 
  long 
  neurointestinal 
  connective 
  (B^) 
  is 
  

   attached 
  to 
  the 
  lower 
  side 
  of 
  the 
  alimentary 
  canal. 
  The 
  relation 
  is 
  

   similar 
  to 
  that 
  of 
  Bonellia. 
  Anteriorly 
  the 
  neurointestinal 
  connec- 
  

   tion 
  divides 
  into 
  two 
  branches 
  before 
  joining 
  the 
  ventral 
  vessel. 
  

   There 
  is 
  therefore 
  no 
  enlarged 
  "heart" 
  at 
  the 
  posterior 
  end 
  of 
  dorsal 
  

   vessel, 
  nor 
  a 
  ring 
  vessel 
  embracing 
  the 
  gut 
  at 
  that 
  point. 
  

  

  T^/pe.— 
  U.S.N.M. 
  No. 
  20615. 
  

  

  Type 
  locality. 
  — 
  Monterey 
  Bay, 
  Calif., 
  35-40 
  fathoms, 
  mud, 
  De- 
  

   cember 
  3, 
  1931, 
  3 
  specimens. 
  

  

  Other 
  material 
  examined. 
  — 
  Off 
  southern 
  California 
  (13K 
  miles 
  south 
  

   of 
  Seal 
  Beach), 
  215-225 
  fathoms, 
  green 
  mud, 
  Allan 
  Hancock 
  Foun- 
  

   dation, 
  1 
  specimen. 
  

  

  Remarks. 
  — 
  The 
  specimens 
  are 
  in 
  a 
  poor 
  state 
  of 
  preservation, 
  the 
  

   alimentary 
  canal 
  being 
  soft. 
  

  

  The 
  outstanding 
  features 
  of 
  inamoenus 
  are 
  the 
  two 
  nephridia, 
  the 
  

   internal 
  aperture 
  of 
  which 
  does 
  not 
  have 
  spirally 
  twisted 
  lips; 
  the 
  ex- 
  

   traordinarily 
  long 
  presiphonal 
  gut, 
  and 
  the 
  very 
  long 
  neurointestinal 
  

   connective 
  not 
  embracing 
  the 
  interbasal 
  muscle 
  of 
  setae. 
  The 
  vas- 
  

   cular 
  system 
  lacks 
  a 
  definite 
  intestinal 
  ring 
  vessel 
  — 
  probably 
  a 
  generic 
  

   feature. 
  A. 
  inamoenus 
  differs 
  from 
  the 
  only 
  other 
  recognized 
  species, 
  

   arhynchite 
  of 
  northern 
  Japan, 
  in 
  respect 
  to 
  the 
  neurointestinal 
  vessel 
  

  

  