﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  SIPHONOPHOBAE—BIOELOW. 
  59 
  

  

  AEGINA 
  ROSEA 
  EschschoHz. 
  

  

  Aegina 
  rosea 
  Eschscholtz, 
  1829, 
  p. 
  115, 
  pi. 
  11, 
  fig. 
  4. 
  — 
  Vanhoffen, 
  1908, 
  p. 
  48, 
  

   pi. 
  7, 
  figs. 
  1, 
  2; 
  pi. 
  9, 
  figs. 
  16-19.— 
  Maas, 
  1909, 
  p. 
  35. 
  

   Aegina 
  altemans 
  Bigelow, 
  1909a, 
  p. 
  74, 
  pi. 
  17, 
  fig. 
  1. 
  

  

  Station 
  4761, 
  1973-0 
  fathoms; 
  1 
  specimen, 
  35 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4774, 
  557-0 
  fathoms; 
  1 
  specimen, 
  40 
  mm. 
  in 
  diameter. 
  

  

  Both 
  are 
  ratJier 
  fragmentary. 
  

  

  The 
  large 
  specimen 
  agrees 
  so 
  well 
  with 
  my 
  A. 
  alternans, 
  except 
  

   that 
  it 
  has 
  five 
  antimeres, 
  that 
  I 
  had 
  no 
  doubt 
  at 
  first 
  that 
  I 
  was 
  

   dealing 
  with 
  a 
  second 
  representative 
  of 
  that 
  species, 
  and 
  consequently 
  

   that 
  its 
  validity 
  was 
  fairly 
  well 
  assured. 
  But 
  when 
  I 
  examined 
  the 
  

   smaller 
  one 
  I 
  saw 
  at 
  once 
  that 
  this 
  was 
  not 
  the 
  case. 
  The 
  distinctive 
  

   feature 
  of 
  alternans 
  was 
  that 
  it 
  had 
  four 
  gastric 
  pouches 
  alternating 
  

   with 
  the 
  canals, 
  and 
  not 
  divided 
  at 
  all 
  in 
  the 
  interradii, 
  and 
  this 
  is 
  

   exactly 
  the 
  condition 
  in 
  the 
  specimen 
  from 
  station 
  4761. 
  But 
  in 
  the 
  

   other, 
  which 
  has 
  six 
  tentacles, 
  two 
  of 
  the 
  antimeres 
  have 
  two 
  

   pouches 
  each, 
  discontinuous 
  in 
  the 
  interradii 
  exactly 
  as 
  in 
  the 
  other 
  

   Aeginas, 
  three 
  have 
  a 
  single 
  undivided 
  pouch, 
  as 
  alternans; 
  but 
  the 
  

   sixth 
  gives 
  us 
  the 
  clue, 
  for 
  in 
  this 
  one 
  the 
  interradial 
  septum 
  sepa- 
  

   rating 
  the 
  two 
  pouches 
  has 
  broken 
  down 
  distally, 
  putting 
  the 
  two 
  

   cavities 
  into 
  communication 
  with 
  each 
  other, 
  though 
  its 
  proximal 
  por- 
  

   tion 
  remains 
  intact. 
  The 
  specimen 
  is 
  so 
  large 
  that 
  the 
  exact 
  state 
  

   of 
  affairs 
  is 
  easily 
  traced, 
  and 
  the 
  fact 
  that 
  in 
  the 
  antimeres 
  in 
  

   which 
  the 
  pouches 
  are 
  confluent 
  there 
  is 
  no 
  visible 
  evidence 
  that 
  a 
  

   septum 
  formerly 
  existed 
  explains 
  my 
  failure 
  see 
  an 
  indication 
  of 
  

   anything 
  of 
  the 
  sort 
  in 
  the 
  original 
  specimen 
  of 
  "altemans." 
  

  

  AEGINA 
  CITREA 
  Eschscholtz. 
  

  

  Aegina 
  dtrea 
  Eschscholtz, 
  1829, 
  p. 
  113, 
  pi. 
  11, 
  fig. 
  4. 
  

  

  (For 
  synonymy, 
  see 
  Mayer, 
  1910, 
  p. 
  451.) 
  

  

  Station 
  4757, 
  depth?; 
  1 
  specimen, 
  29 
  mm. 
  in 
  diameter, 
  with 
  four 
  

   antimeres, 
  rather 
  fragmentary; 
  in 
  alcohol. 
  

  

  Station 
  4978, 
  surface; 
  1 
  specimen, 
  15 
  mm. 
  in 
  diameter, 
  with 
  four 
  

   antimeres. 
  

  

  The 
  specimens 
  add 
  nothing, 
  except 
  the 
  record 
  of 
  occurrence, 
  to 
  

   our 
  knowledge 
  of 
  the 
  species. 
  The 
  identification 
  rests 
  on 
  the 
  fact 
  

   that 
  the 
  8 
  gastric 
  pockets 
  are 
  subdivided 
  into 
  16 
  by 
  deep 
  marginal 
  

   notches, 
  exactly 
  as 
  in 
  the 
  eastern 
  Pacific 
  examples 
  (1909(i). 
  

  

  AEGINA, 
  species? 
  

  

  Station 
  4762, 
  50-0 
  fathoms 
  ; 
  2 
  specimens, 
  7 
  and 
  9 
  mm. 
  in 
  diameter. 
  

   Station 
  4785, 
  300-0 
  fathoms; 
  3 
  specimens, 
  6 
  and 
  7 
  mm. 
  in 
  diameter. 
  

   Station 
  4793, 
  300-0 
  fathoms; 
  4 
  specimens, 
  5-8 
  mm. 
  in 
  diameter. 
  

   Station 
  4797, 
  300-0 
  fathoms; 
  2 
  specimens, 
  6 
  and 
  10 
  mm. 
  in 
  

   diameter. 
  

  

  