﻿250 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  c^. 
  Three 
  nephridia, 
  an 
  unpaired 
  between 
  a 
  pair; 
  ovary 
  along 
  nerve 
  cord; 
  

   anal 
  vesicles: 
  a 
  fascicle 
  of 
  tubules 
  at 
  end 
  of 
  a 
  collecting 
  tube. 
  

  

  Archibonellia 
  Fischer 
  " 
  

   6^. 
  No 
  setae 
  present. 
  

  

  c*. 
  Nephrostome 
  situated 
  at 
  end 
  of 
  a 
  short 
  lateral 
  tube 
  near 
  blind 
  distal 
  end 
  

  

  of 
  nephridium 
  Parabonellia 
  Onoda 
  

  

  c^. 
  Distal 
  end 
  of 
  nephridium 
  expanded 
  into 
  plicated 
  rim 
  of 
  large 
  nephro- 
  

   stome 
  Eubonellia, 
  new 
  genus 
  (p. 
  255) 
  

  

  a^. 
  Proboscis 
  when 
  present 
  similar 
  to 
  that 
  of 
  Thalassema 
  and 
  not 
  bifid 
  at 
  extremity. 
  

   6'. 
  No 
  sharply 
  marked 
  groove 
  between 
  nephridiopore 
  and 
  mouth. 
  

  

  c*. 
  Female 
  with 
  2 
  well-developed 
  ventral 
  setae; 
  anal 
  vesicles 
  2, 
  elongate, 
  

   dendritic; 
  nephrostome 
  near 
  base 
  of 
  the 
  single 
  nephridium; 
  male 
  un- 
  

   known 
  Protobonellia 
  Ikeda 
  

  

  c^. 
  Female 
  with 
  2 
  ventral 
  setae; 
  nephridia 
  2, 
  large, 
  with 
  basal 
  2-lipped 
  

   nephrostome; 
  anal 
  glands 
  wide 
  sacs 
  provided 
  with 
  a 
  very 
  large 
  number 
  

   of 
  slender 
  excretory 
  tubules 
  with 
  apical 
  funnel; 
  male 
  unknown. 
  

  

  Maxmiilleria 
  Bock 
  

   c^. 
  No 
  ventral 
  setae 
  in 
  female. 
  

  

  rfi. 
  Proboscis 
  deciduous, 
  Thalassema-like; 
  2 
  external 
  papillae 
  marking 
  

   nephridiopores; 
  nephridia 
  2 
  or 
  1 
  with 
  basal 
  nephrostome; 
  anal 
  

   vesicles 
  in 
  2 
  thick 
  clusters 
  of 
  tubules 
  opening 
  into 
  a 
  common 
  duct; 
  

  

  male 
  with 
  ventral 
  hooks 
  Hamingia 
  Danielssen 
  and 
  Koren 
  

  

  c*. 
  In 
  place 
  of 
  proboscis 
  a 
  short 
  truncate 
  snout; 
  a 
  proboscis 
  possibly 
  normally 
  

   present; 
  1 
  nephridium 
  with 
  basal 
  nephrostome; 
  duct 
  of 
  nephridium 
  

   passing 
  under 
  nerve 
  cord 
  and 
  opening 
  in 
  median 
  line 
  into 
  a 
  funnel- 
  

   shaped 
  depression 
  of 
  skin; 
  anal 
  vesicles; 
  numerous 
  dendritic 
  masses 
  

   arising 
  from 
  a 
  basal 
  bladder 
  on 
  each 
  side 
  of 
  large 
  muscular 
  cloaca; 
  

   terminal 
  portion 
  of 
  hind-gut, 
  in 
  front 
  of 
  cloaca, 
  greatly 
  enlarged; 
  male 
  

  

  unknown 
  Nellobia, 
  new 
  genus 
  (p. 
  257) 
  

  

  ^2. 
  A 
  narrow, 
  or 
  expanded, 
  slit 
  extending 
  forward 
  from 
  nephridiopore, 
  in 
  2 
  

   species 
  containing 
  8-10 
  tiny, 
  integumentary 
  spines; 
  anal 
  vesicles 
  not 
  in 
  

   form 
  of 
  2 
  dendritic 
  structures 
  or 
  2 
  clusters 
  of 
  tubules, 
  but 
  in 
  form 
  of 
  

   independent 
  branched 
  tubes 
  or 
  an 
  asymmetrical 
  cluster; 
  1 
  or 
  2 
  nephridia 
  

   with 
  nephrostome 
  near 
  base; 
  males 
  with 
  or 
  without 
  hooks. 
  

  

  Acanthoharaingia 
  Ikeda 
  (p. 
  260) 
  

  

  n 
  Wilhelm 
  Fischer, 
  1919, 
  p. 
  283, 
  figs. 
  5, 
  6; 
  1926b, 
  p. 
  207, 
  pi. 
  2, 
  figs. 
  1-7, 
  text 
  figs. 
  1, 
  2. 
  Archibonellia 
  michael- 
  

   soni, 
  the 
  type, 
  from 
  a 
  coral 
  reef, 
  Rottnest 
  Island, 
  Fremantle, 
  Australia, 
  is 
  only 
  12 
  mm. 
  long; 
  it 
  has 
  a 
  large 
  

   median 
  between 
  and 
  above 
  two 
  small 
  nephridia 
  (no 
  nephrostomes 
  were 
  found). 
  The 
  proboscis 
  has 
  two 
  

   terminal 
  lappets 
  instead 
  of 
  divisions, 
  and 
  the 
  alimentary 
  canal 
  is 
  short, 
  scarcely 
  over 
  twice 
  length 
  of 
  body. 
  

   A. 
  mj6bergi 
  (1926b, 
  p. 
  208, 
  fig. 
  1. 
  northwest 
  coast 
  of 
  Australia), 
  however, 
  has 
  a 
  very 
  small 
  unpaired 
  nephridium 
  

   (with 
  basal 
  nephrostome) 
  between 
  a 
  pair 
  of 
  very 
  large 
  "uteri" 
  filled 
  with 
  eggs 
  and 
  with 
  terminal 
  nephro- 
  

   stome. 
  The 
  alimentary 
  canal 
  is 
  of 
  normal 
  length 
  for 
  a 
  bonelliid, 
  and 
  the 
  proboscis 
  is 
  normally 
  cleft 
  at 
  the 
  

   tip. 
  Fischer, 
  in 
  a 
  quandry 
  what 
  to 
  do 
  with 
  this 
  species, 
  places 
  it 
  in 
  Pseudobonellia 
  on 
  the 
  basis 
  of 
  the 
  large 
  

   paired 
  nephridia, 
  with 
  terminal 
  nephrostomes, 
  and 
  the 
  normal 
  alimentary 
  canal 
  and 
  proboscis. 
  Even 
  though 
  

   the 
  androecium 
  of 
  Pseudobonellia 
  may 
  well 
  have 
  originated 
  in 
  an 
  unpaired 
  nephridium, 
  the 
  fact 
  remains 
  

   that 
  in 
  Pseudobonellia 
  the 
  androecium 
  is 
  highly 
  specialized 
  and 
  is 
  no 
  longer 
  a 
  nephridium, 
  while 
  the 
  ovary 
  is 
  

   not 
  found 
  along 
  the 
  nerve 
  cord, 
  as 
  in 
  Archibonellia, 
  and 
  the 
  tubes 
  of 
  the 
  anal 
  vesicles 
  open 
  separately 
  into 
  the 
  

   cloaca, 
  not 
  into 
  a 
  common 
  duct. 
  The 
  two 
  species 
  of 
  ^rcftiftoneHia 
  may 
  not 
  be 
  congeneric, 
  but 
  the 
  aberrant 
  

   species 
  is 
  certainly 
  widely 
  different 
  from 
  Pseudobonellia. 
  

  

  Figure 
  IS. 
  — 
  Bonellia 
  viridis: 
  Dissection 
  (X 
  5) 
  of 
  anterior 
  part 
  of 
  specimen 
  from 
  Naples 
  

   to 
  show 
  particularly 
  the 
  position 
  of 
  nephrostome, 
  CF, 
  at 
  base 
  of 
  nephridium, 
  N, 
  which 
  was 
  

   55 
  mm. 
  long 
  while 
  the 
  animal 
  was 
  only 
  45 
  mm. 
  Note 
  the 
  long 
  segment 
  of 
  gut 
  between 
  

   gizzard, 
  G, 
  and 
  beginning 
  of 
  siphon, 
  Sil. 
  The 
  anterior 
  end 
  of 
  gonad, 
  Go, 
  Is 
  shown. 
  {B 
  ^, 
  

   B^, 
  B*, 
  dorsal, 
  neurointestinal, 
  and 
  ventral 
  blood 
  vessels; 
  C, 
  stomach; 
  G, 
  gizzard; 
  NC, 
  

   nerve 
  cord; 
  0, 
  esophagus; 
  P, 
  pharynx.) 
  

  

  