﻿742 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [36] 
  

  

  This 
  genus 
  with 
  the 
  preceding 
  one, 
  to 
  which 
  it 
  is 
  closely 
  related, 
  

   seem 
  to 
  form 
  a 
  group 
  by 
  themselves 
  in 
  the 
  family, 
  distinguished 
  by 
  

   having 
  a 
  single 
  pair 
  of 
  tentacular 
  cirri, 
  and 
  by 
  the 
  existence 
  of 
  dorsal 
  

   cirri 
  along 
  the 
  entire 
  body. 
  

  

  Tharyx 
  acutus, 
  n. 
  sp. 
  

  

  (Pl. 
  VII, 
  Figs. 
  99-103.) 
  

  

  Head 
  long, 
  conical; 
  no 
  eyes; 
  no 
  appendages 
  of 
  any 
  kind 
  (fig. 
  99). 
  

   First 
  two 
  (three 
  1 
  ?) 
  segments 
  without 
  appendages. 
  Tentacular 
  cirri 
  very 
  

   large, 
  very 
  long, 
  deeply 
  and 
  widely 
  canaliculated, 
  margins 
  of 
  the 
  canal 
  

   deeply 
  scalloped. 
  Next 
  segment 
  very 
  short, 
  with 
  dorsal 
  cirri, 
  but 
  with- 
  

   out 
  setae. 
  

  

  On 
  the 
  anterior 
  segments 
  (fig. 
  100) 
  the 
  dorsal 
  setae 
  are 
  about 
  one-half 
  

   as 
  long 
  as 
  the 
  width 
  of 
  the 
  body; 
  on 
  the 
  middle 
  third 
  they 
  are 
  very 
  

   much 
  elongated 
  (fig. 
  101), 
  growing 
  shorter 
  again 
  along 
  the 
  posterior 
  

   third 
  (figs. 
  102, 
  103). 
  The 
  ventral 
  setae 
  have 
  throughout 
  about 
  the 
  

   length 
  of 
  the 
  anterior 
  dorsal 
  setae. 
  

  

  The 
  anterior 
  (20-30) 
  segments 
  are 
  very 
  short 
  ; 
  farther 
  back 
  they 
  gain 
  

   gradually 
  until 
  the 
  length 
  of 
  each 
  segment 
  is 
  about 
  equal 
  to 
  one-half 
  

   its 
  width. 
  

  

  The 
  form 
  of 
  the 
  body 
  is 
  shown 
  in 
  figs. 
  100-103. 
  

  

  Body 
  brown, 
  yellow, 
  or 
  yellowish 
  white; 
  numerous 
  umber-brown 
  

   specks 
  on 
  the 
  body 
  and 
  cirri 
  ; 
  tentacular 
  cirri 
  white, 
  specked 
  with 
  um- 
  

   ber-brown. 
  

  

  Length, 
  12-15 
  mm 
  . 
  

  

  Diameter, 
  0.5-0.7 
  mm 
  . 
  

  

  Common 
  ; 
  sand 
  and 
  sandy 
  mud 
  ; 
  6-12 
  fathoms. 
  

  

  Tharyx 
  similis, 
  n. 
  sp. 
  

   (Pl. 
  VII, 
  Fig. 
  104.) 
  

  

  We 
  found 
  a 
  few 
  specimens 
  of 
  a 
  second 
  species 
  of 
  this 
  genus 
  similar 
  to 
  

   the 
  first, 
  but 
  differing 
  from 
  it 
  in 
  some 
  particulars. 
  Head 
  and 
  first 
  four 
  

   segments 
  as 
  in 
  the 
  last 
  species, 
  except 
  that 
  the 
  head 
  is 
  a 
  little 
  shorter 
  

   and 
  larger 
  at 
  base 
  ; 
  tentacular 
  cirri 
  also 
  shorter 
  and 
  stouter. 
  Dorsal 
  

   setae 
  longest 
  and 
  most 
  numerous 
  on 
  the 
  anterior 
  segments. 
  Ventral 
  setae 
  

   on 
  anterior 
  segments 
  (6-8) 
  similar 
  to 
  the 
  dorsal 
  ; 
  then 
  from 
  2-4 
  setae 
  

   shorter, 
  stouter, 
  slightly 
  curved 
  at 
  the 
  end, 
  are 
  introduced, 
  alternating 
  

   with 
  the 
  straight 
  capillary 
  setae. 
  

  

  These 
  setae 
  are 
  arranged, 
  not 
  very 
  close 
  to 
  each 
  other, 
  so 
  as 
  to 
  form 
  

   a 
  single 
  series 
  running 
  down 
  the 
  side 
  of 
  the 
  body. 
  Anterior 
  segments 
  

   short; 
  posterior 
  segment 
  longer, 
  and 
  with 
  the 
  lines 
  of 
  segmentation 
  so 
  

   deep 
  and 
  well 
  defined 
  as 
  to 
  give 
  to 
  the 
  posterior 
  two- 
  thirds 
  of 
  the 
  body 
  

   a 
  moniliform 
  appearance. 
  

  

  Body 
  and 
  tentacular 
  cirri 
  green, 
  with 
  numerous 
  dark-brown 
  spots 
  ; 
  

   dorsal 
  cirri, 
  colorless. 
  

  

  