﻿58 
  PROCEEDINOS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  number 
  varying 
  from 
  2-4 
  to 
  the 
  antimere. 
  This 
  is 
  the 
  same 
  number 
  

   which 
  I 
  counted 
  in 
  the 
  eastern 
  Pacific 
  specimens 
  (2-3 
  to 
  the 
  anti- 
  

   mere, 
  1909a, 
  p. 
  69), 
  and 
  Plaeckel's 
  specimens, 
  too, 
  had 
  very 
  few 
  (1-3 
  

   to 
  the 
  lappet). 
  In 
  marsTialli 
  and 
  albescens 
  there 
  are 
  many 
  more 
  

   otocysts 
  in 
  each 
  antimere, 
  up 
  to 
  15 
  havmg 
  been 
  recorded 
  for 
  the 
  

   former 
  and 
  10 
  for 
  the 
  latter. 
  

  

  Genus 
  CUNINA 
  Eschscholtz, 
  1829, 
  

  

  CUNINA 
  PEREGRINA 
  Bigelow. 
  

  

  Cunina 
  peregrina 
  Bigelow, 
  1909a, 
  p. 
  59, 
  pi. 
  1, 
  fig. 
  6; 
  pi. 
  15, 
  figs. 
  1, 
  2; 
  pi. 
  28, 
  

   figs. 
  1-7; 
  pi. 
  45, 
  fig. 
  8. 
  

  

  Station 
  4978, 
  surface; 
  1 
  specimen, 
  in 
  fair 
  condition. 
  

  

  C. 
  peregrina 
  has 
  been 
  recorded 
  from 
  Japan 
  by 
  Maas 
  (1909). 
  

  

  Family 
  AEGINIDAE 
  Gegenbaur, 
  1856. 
  

  

  Genus 
  AEGINA 
  Eschscholtz, 
  1829. 
  

  

  Sensw 
  Maas 
  (1904, 
  1905), 
  Bigelow 
  (1909a). 
  

  

  Kecent 
  studies 
  by 
  Vanhoffen 
  (1908) 
  and 
  by 
  Maas 
  (1909), 
  and 
  my 
  

   own 
  examination 
  of 
  the 
  Fisheries 
  steamer 
  Albatross 
  PhiHppine 
  col- 
  

   lection 
  have 
  shown 
  that 
  my 
  union 
  (1909a) 
  of 
  A. 
  rosea 
  with 
  A. 
  citrea 
  

   was 
  incorrect, 
  because 
  the 
  former 
  is 
  separated 
  from 
  the 
  latter 
  both 
  

   by 
  color 
  and 
  by 
  the 
  important 
  fact 
  that 
  the 
  eight 
  gastric 
  pouches 
  

   (four 
  double 
  pouches) 
  are 
  not 
  further 
  subdivided 
  even 
  in 
  large 
  speci- 
  

   mens, 
  whereas 
  in 
  citrea 
  each 
  is 
  deeply 
  notched 
  at 
  the 
  margin 
  at 
  

   maturity. 
  And 
  the 
  difference 
  has 
  been 
  established 
  on 
  sufficiently 
  

   large 
  numbers 
  of 
  specimens 
  to 
  show 
  that 
  it 
  deserves 
  recognition. 
  

  

  The 
  eastern 
  Pacific 
  collection 
  was 
  all 
  of 
  the 
  citrea 
  type 
  except 
  for 
  

   one 
  specimen 
  which 
  had 
  four 
  gastric 
  pockets 
  alternating 
  with 
  the 
  

   four 
  peroniae, 
  and 
  which 
  I 
  made 
  the 
  basis 
  of 
  a 
  new 
  species, 
  A. 
  alter- 
  

   nans. 
  But 
  the 
  present 
  series 
  shows 
  that 
  this 
  specimen 
  was 
  merely 
  

   an 
  abnormal, 
  or 
  perhaps 
  regenerated, 
  rosea, 
  and 
  the 
  name 
  must 
  

   therefore 
  be 
  abandoned. 
  It 
  is 
  probable 
  that 
  all 
  the 
  Aeginas 
  yet 
  

   described 
  belong 
  either 
  to 
  rosea 
  or 
  to 
  citrea, 
  for 
  A. 
  rhodina 
  Haeckel, 
  

   recently 
  redescribed 
  by 
  Mayer 
  (1910), 
  agrees 
  with 
  rosea 
  in 
  its 
  gas- 
  

   tric 
  pouches; 
  the 
  large 
  specimens 
  recorded 
  by 
  Haeckel 
  were 
  no 
  

   doubt 
  rosea; 
  the 
  small 
  one, 
  of 
  7 
  mm., 
  studied 
  by 
  Mayer, 
  might 
  

   equally 
  well 
  be 
  the 
  young 
  of 
  rosea 
  or 
  of 
  citrea. 
  Vanhoffen's 
  lactea 
  

   is 
  separated 
  from 
  rosea 
  only 
  by 
  the 
  absence 
  of 
  color 
  over 
  the 
  gas- 
  

   tric 
  system, 
  and 
  his 
  brunnea 
  by 
  the 
  brown 
  color 
  of 
  the 
  stomach. 
  

   These 
  are 
  known 
  from 
  one 
  specimen 
  each; 
  far 
  too 
  little 
  material 
  to 
  

   show 
  that 
  these 
  color 
  differences 
  have 
  any 
  phylogenetic 
  meaning. 
  

   Even 
  if 
  we 
  leave 
  these 
  three 
  forms 
  out 
  of 
  account, 
  rosea 
  and 
  citrea 
  

   are 
  both 
  known 
  from 
  the 
  Atlantic 
  as 
  well 
  as 
  from 
  the 
  Indo-Pacific 
  

   (Maas, 
  1909; 
  Vanhoffen, 
  1908). 
  

  

  