﻿92 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  DACTYLOMETRA 
  PACIFICA 
  Gotte. 
  

  

  Dactylometra 
  quinquecirrha, 
  var. 
  pacijica 
  Gotte, 
  1886, 
  p. 
  834. 
  

  

  Daclylovietra 
  ferruginaster 
  Kishinouye, 
  1892, 
  p. 
  264, 
  pi. 
  3.— 
  Mayer, 
  1910, 
  p. 
  588. 
  

  

  Dactylometra 
  longicirrha 
  Kishinouye, 
  1892, 
  p. 
  261, 
  pi. 
  2. 
  

  

  Kuragea 
  depressa 
  Kishinouye, 
  1902, 
  p. 
  9, 
  pi. 
  1, 
  fig. 
  7. 
  

  

  Dactylometra 
  pacijica, 
  y&r 
  . 
  ferruginaster 
  Maas, 
  1909, 
  p. 
  44, 
  pi. 
  2, 
  fig. 
  14. 
  

  

  Tsuruga 
  Gulf, 
  Japan, 
  surface, 
  July 
  23; 
  six 
  specimens, 
  38-81 
  mm. 
  

   in 
  diameter; 
  in 
  good 
  condition. 
  

  

  The 
  smallest 
  specimen 
  has 
  4, 
  4, 
  5, 
  5, 
  5, 
  5, 
  3, 
  and 
  4 
  tentacles 
  in 
  the 
  

   eight 
  octants; 
  all 
  others 
  have 
  five 
  in 
  each 
  octant; 
  the 
  central 
  are 
  

   often, 
  but 
  not 
  always, 
  the 
  largest, 
  the 
  two 
  on 
  either 
  side 
  slightly 
  

   smaller, 
  i. 
  e., 
  younger. 
  In 
  Maas's 
  specimens 
  (40 
  and 
  90 
  mm.) 
  the 
  

   lappets 
  next 
  the 
  rhopalar 
  lappets 
  were 
  the 
  smallest 
  (Maas, 
  1909, 
  

   pi. 
  2, 
  fig. 
  14); 
  and 
  this 
  is 
  true 
  of 
  our 
  smallest 
  specimen. 
  But 
  in 
  the 
  

   large 
  ones 
  the 
  tentacular 
  lappets 
  are 
  all 
  about 
  the 
  same 
  size, 
  though 
  

   distinctly 
  smaller 
  than 
  the 
  rhopalar 
  lappets. 
  

  

  The 
  rhopalia 
  resemble 
  those 
  of 
  quinquecirrha 
  so 
  closely 
  that 
  I 
  can 
  

   find 
  nothing 
  to 
  separate 
  them. 
  

  

  Color. 
  — 
  In 
  the 
  largest 
  specimen 
  the 
  reddish-brown 
  exumbral 
  star, 
  

   which 
  suggested 
  the 
  nsune 
  ferruginaster, 
  is 
  faintly 
  visible; 
  the 
  others 
  

   have 
  lost 
  their 
  color 
  in 
  the 
  preservative. 
  

  

  Family 
  CYANEIDAE 
  L. 
  Agassiz, 
  1862. 
  

   Genus 
  CYANEA 
  Peron 
  and 
  Lesueur, 
  1809. 
  

  

  At 
  present 
  it 
  seems 
  impossible 
  to 
  distinguish 
  more 
  than 
  one 
  species 
  

   in 
  this 
  genus, 
  for 
  although 
  several 
  forms 
  have 
  been 
  described 
  which 
  

   are 
  so 
  unlike, 
  especially 
  in 
  color, 
  as 
  to 
  be 
  recognizable 
  at 
  a 
  glance, 
  

   they 
  are 
  all 
  connected 
  by 
  intermediates. 
  A 
  revision 
  of 
  the 
  Cyaneas, 
  

   with 
  a 
  study 
  of 
  their 
  exact 
  geographic 
  ranges 
  is 
  much 
  to 
  be 
  desired 
  ; 
  

   but 
  to 
  be 
  of 
  value 
  it 
  wUl 
  require 
  a 
  much 
  larger 
  series 
  of 
  well-preserved 
  

   material 
  than 
  I 
  have 
  at 
  my 
  command. 
  Mayer 
  (1910, 
  p. 
  597) 
  has 
  

   given 
  an 
  excellent 
  synopsis 
  of 
  the 
  various 
  varieties. 
  

  

  The 
  present 
  collection 
  contains 
  two 
  forms 
  ; 
  one 
  from 
  the 
  Bering 
  

   Sea, 
  apparently 
  identical 
  with 
  C. 
  ferruginea 
  of 
  Eschscholtz; 
  probably 
  

   also 
  with 
  the 
  C. 
  postelsii 
  of 
  Brandt. 
  Comparison 
  between 
  it 
  and 
  a 
  

   "lamarckii" 
  from 
  the 
  North 
  Sea 
  and 
  an 
  "ardica" 
  from 
  New 
  England, 
  

   shows 
  that 
  it 
  agrees 
  with 
  the 
  former, 
  and 
  with 
  the 
  figures 
  of 
  "capil- 
  

   lata" 
  (VsLuhofien), 
  in 
  the 
  size 
  and 
  shape 
  of 
  the 
  rhopalar 
  lappets, 
  with 
  

   the 
  latter 
  in 
  yellowish 
  color, 
  and 
  in 
  the 
  arrangement 
  of 
  the 
  lappet 
  

   canals. 
  

  

  It 
  is 
  so 
  doubtful 
  whether 
  there 
  is 
  anything 
  to 
  distinguish 
  the 
  var. 
  

   "ferruginea" 
  from 
  capiUata 
  that 
  the 
  specimens 
  are 
  referred 
  to 
  the 
  

   latter. 
  

  

  The 
  second 
  form, 
  from 
  southern 
  Japan, 
  is 
  undoubtedly 
  the 
  C. 
  nozalcii 
  

   of 
  Kishinouye 
  (1891). 
  It 
  is 
  distinguished 
  by 
  the 
  entire 
  lack 
  of 
  color, 
  

  

  