﻿42 
  PROCEEDINOS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  Station 
  3325 
  (Bering 
  Sea), 
  109-0 
  fathoms, 
  August, 
  1890; 
  1 
  specimen. 
  

  

  Unfortunately 
  all 
  of 
  the 
  specimens 
  are 
  in 
  poor 
  condition, 
  the 
  

   exumbrella 
  being 
  much 
  damaged 
  and 
  the 
  margin 
  so 
  nearly 
  destroyed 
  

   that 
  there 
  is 
  not 
  a 
  single 
  tentacle 
  or 
  sense-club 
  intact. 
  But 
  specific 
  

   identification 
  rests 
  on 
  a 
  comparison 
  with 
  a 
  better 
  series 
  from 
  Labrador 
  

   (Bigelow, 
  1909c, 
  p. 
  310). 
  In 
  two 
  examples 
  the 
  subumbrclla, 
  gonads, 
  

   and 
  manubrium 
  are 
  in 
  good 
  condition, 
  and 
  show 
  clearly 
  that 
  Browne 
  

   (1903) 
  was 
  entirely 
  correct 
  in 
  his 
  description 
  of 
  the 
  gonads 
  as 
  situated 
  

   exclusively 
  on 
  the 
  walls 
  of 
  the 
  manubrium 
  entirely 
  independent 
  of 
  

   the 
  radial 
  canals. 
  In 
  both 
  the 
  specimens 
  in 
  question 
  the 
  gonads 
  are 
  

   discontuiuous 
  along 
  the 
  narrow 
  line 
  of 
  attachment 
  of 
  the 
  mesenteries 
  

   to 
  the 
  manubrium 
  just 
  as 
  they 
  were 
  in 
  my 
  Labrador 
  specimens 
  and 
  

   those 
  described 
  by 
  Browne, 
  as 
  well 
  as 
  in 
  the 
  interradii, 
  so 
  that 
  there 
  

   are 
  16 
  separate 
  adradial 
  sexual 
  masses. 
  

  

  In 
  one 
  specimen 
  the 
  mouth 
  is 
  protruded 
  in 
  a 
  tube 
  of 
  considerable 
  

   length; 
  in 
  the 
  other 
  it 
  is 
  contracted; 
  in 
  both 
  the 
  lip 
  is 
  simple 
  and 
  

   circular. 
  

  

  Ptychogastria 
  polaris 
  is 
  kno^v^l 
  from 
  the 
  coast 
  of 
  Nova 
  Scotia, 
  

   Labrador, 
  Greenland, 
  Spitzbergen, 
  Norway, 
  the 
  north 
  coast 
  of 
  

   Russia, 
  and 
  Barents 
  Sea. 
  

  

  Family 
  TRACHYNEMIDAE 
  Gegenbaur, 
  1856. 
  

  

  Genus 
  AGLAURA 
  Peron 
  and 
  Lesueur, 
  1809. 
  

  

  AGLAURA 
  HEMISTOMA 
  Peron 
  and 
  Lesueur. 
  

  

  Aglaura 
  hemistoma 
  Peron 
  and 
  Lesueur, 
  1809, 
  p. 
  351. 
  

  

  (For 
  synonymy, 
  see 
  Bigelow, 
  1909a, 
  p. 
  119, 
  and 
  Mayer, 
  1910, 
  p. 
  398.) 
  

  

  Station 
  4896, 
  surface; 
  10 
  specimens, 
  1.5-4 
  mm. 
  high. 
  

  

  Sado 
  Island, 
  Sea 
  of 
  Japan, 
  surface; 
  14 
  specimens, 
  1.5-3 
  mm. 
  high. 
  

  

  Station 
  4955, 
  surface; 
  2 
  specimens. 
  

  

  The 
  specimens 
  show 
  variation 
  in 
  general 
  form, 
  some 
  being 
  higher 
  

   and 
  narrower, 
  others 
  lower 
  and 
  broader; 
  but 
  all 
  are 
  circular 
  in 
  cross 
  

   section, 
  and 
  so 
  were 
  the 
  Japanese 
  specimens 
  studied 
  by 
  Maas 
  (1909). 
  

   The 
  smaDest, 
  1.5 
  mm. 
  high, 
  have 
  no 
  gonads, 
  but 
  these 
  organs 
  are 
  

   visible 
  in 
  some 
  2.5 
  mm. 
  high, 
  and 
  are 
  well 
  developed 
  in 
  the 
  larger 
  

   specimens. 
  

  

  Genus 
  AGLANTHA 
  Haeckel, 
  1879. 
  

  

  The 
  collection 
  contains 
  a 
  considerable 
  series 
  of 
  Aglantha, 
  and 
  

   though 
  most 
  of 
  the 
  specimens 
  are 
  in 
  poor 
  condition 
  they 
  show 
  that 
  

   they 
  belong 
  to 
  a 
  large 
  form 
  with 
  more 
  than 
  four 
  [probably 
  normally 
  

   eight] 
  otocysts, 
  and 
  that 
  the 
  gonads 
  first 
  appear 
  in 
  specimens 
  8-10 
  

   mm. 
  high. 
  They 
  thus 
  agree 
  with 
  the 
  larger 
  of 
  the 
  two 
  size-varieties 
  

   of 
  Aglantlia 
  vfhichl 
  recorded 
  from 
  Labrador 
  (1909c), 
  and 
  these 
  same 
  

   characters 
  distinguish 
  a 
  series 
  collected 
  by 
  the 
  Michael 
  Sars 
  in 
  the 
  

  

  