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  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  sa 
  

  

  Off 
  Bluff 
  Cove 
  (8 
  lots) 
  25-100 
  fathoms, 
  mud, 
  fine 
  sand, 
  32 
  specimens. 
  

  

  Off 
  Redondo 
  Beach 
  (15 
  lots), 
  10-120 
  fathoms, 
  mud, 
  fine 
  sand, 
  coarse 
  sand 
  and 
  

  

  mud, 
  44 
  specimens. 
  

   Off 
  Point 
  Vicente 
  Lighthouse, 
  17-40 
  fathoms, 
  coarse 
  sand 
  and 
  mud, 
  4 
  specimens. 
  

   Off 
  Portuguese 
  Point, 
  16-20 
  fathoms, 
  gray 
  sand 
  and 
  seaweed, 
  2 
  specimens. 
  

   Cortes 
  Bank, 
  60 
  fathoms, 
  sand, 
  broken 
  shell, 
  3 
  specimens. 
  

   Off 
  Point 
  Mugu, 
  26-30 
  fathoms, 
  mud, 
  2 
  specimens. 
  

   Santa 
  Catalina 
  Island, 
  50-51 
  fathoms, 
  mud, 
  3 
  specimens. 
  

   Santa 
  Cruz 
  Island 
  (5 
  lots), 
  31-138 
  fathoms, 
  mud, 
  sand, 
  15 
  specimens. 
  

   Santa 
  Rosa 
  Island, 
  28-45 
  fathoms, 
  5 
  specimens. 
  

   San 
  Miguel 
  Island, 
  35 
  fathoms, 
  mud, 
  20 
  specimens. 
  

  

  Remarks. 
  — 
  The 
  type 
  and 
  largest 
  specimens 
  were 
  recovered 
  from 
  

   the 
  stomach 
  of 
  flomiders 
  from 
  moderate 
  depths 
  of 
  Monterey 
  Bay. 
  

   In 
  nearly 
  all 
  the 
  examples 
  the 
  intestme 
  is 
  disintegrated 
  and 
  the 
  body 
  

   cavity 
  filled 
  with 
  pellets 
  of 
  fine 
  sand. 
  This 
  is 
  true 
  also 
  of 
  specimens 
  

   from 
  southern 
  California, 
  which 
  were 
  dredged 
  and 
  placed 
  almost 
  at 
  

   once 
  into 
  alcohol. 
  

  

  After 
  the 
  drawings 
  and 
  description 
  were 
  completed 
  I 
  received 
  from 
  

   Prof. 
  S. 
  F. 
  Light 
  a 
  carefully 
  hardened 
  specimen 
  from 
  Tomales 
  Bay, 
  

   collected 
  at 
  low 
  tide, 
  in 
  mud 
  frequented 
  by 
  the 
  clams 
  Schizoihaerus 
  

   nuiialli 
  and 
  Macoma 
  secta. 
  This 
  specimen 
  (June 
  7) 
  was 
  apparently 
  

   laying 
  eggs 
  as 
  the 
  nephridia 
  are 
  partly 
  emptied. 
  It 
  is 
  especially 
  valu- 
  

   able 
  as 
  it 
  gives 
  the 
  characters 
  of 
  the 
  adult 
  female, 
  is 
  much 
  better 
  pre- 
  

   served 
  than 
  the 
  Monterey 
  specimens, 
  and 
  affords 
  opportunity 
  for 
  

   recording 
  the 
  life 
  colors 
  of 
  a 
  large 
  example. 
  

  

  In 
  the 
  type 
  specimen, 
  near 
  the 
  anterior 
  left 
  nephridium 
  is 
  a 
  light- 
  

   colored 
  lobed 
  mass 
  (pi. 
  22, 
  x) 
  adherent 
  to 
  body 
  wall. 
  It 
  is 
  possibly 
  a 
  

   parasite. 
  

  

  Genus 
  OCHETOSTOMA 
  Leuckart 
  and 
  Riippell 
  

  

  Ochetostoma 
  Leuckart 
  and 
  RtJpPELL, 
  1828, 
  pp. 
  7-8 
  (type, 
  0. 
  erythrogrammon 
  

   Leuckart 
  and 
  Riippell). 
  — 
  Spengel, 
  1912c, 
  p 
  316. 
  

  

  Diagnosis. 
  — 
  Greater 
  part 
  of 
  the 
  thickness 
  of 
  the 
  longitudinal 
  muscle 
  

   layer 
  segregated 
  into 
  separate 
  longitudinal 
  bands. 
  The 
  intervals 
  

   between 
  these 
  bands 
  is 
  crossed 
  by 
  very 
  niunerous 
  separate 
  small 
  

   muscle 
  bundles 
  of 
  the 
  inner 
  oblique 
  layer, 
  which 
  remains 
  for 
  the 
  most 
  

   part 
  continuous 
  and 
  unbroken 
  over 
  the 
  surface 
  of 
  the 
  longitudinal 
  

   bands. 
  Anterior 
  nephridia, 
  1 
  to 
  4 
  pairs, 
  the 
  coelomic 
  aperture 
  having 
  

   spirally 
  coiled 
  lips; 
  with 
  or 
  without 
  coecum 
  at 
  end 
  of 
  intestine; 
  inter- 
  

   basal 
  muscle 
  of 
  setae 
  present 
  or 
  absent; 
  two 
  ventral 
  anterior 
  hooked 
  

   setae; 
  no 
  anal 
  setae. 
  

  

  Remarks. 
  — 
  The 
  list 
  of 
  species 
  that 
  follows 
  is 
  mostly 
  derived 
  from 
  

   literature 
  and 
  is 
  in 
  nowise 
  intended 
  to 
  be 
  a 
  revision, 
  for 
  which 
  speci- 
  

   mens 
  and 
  new 
  dissections 
  will 
  be 
  absolutely 
  essential. 
  Most 
  of 
  the 
  

   species 
  were 
  described 
  as 
  Thalassema. 
  Th. 
  exilii 
  (Fritz 
  Miiller) 
  

   Lampert, 
  which 
  has 
  8 
  to 
  10 
  muscle 
  bands 
  and 
  two 
  pairs 
  of 
  nephridia, 
  

  

  