﻿12 
  PROCEEDIXOS 
  OF 
  THE 
  yATIOXAL 
  MUSEUM. 
  vol.44. 
  

  

  The 
  marginal 
  tentacles 
  are 
  especially 
  interesting, 
  because 
  they 
  

   show 
  the 
  only 
  difference 
  between 
  the 
  Bering 
  Sea 
  and 
  the 
  Atlantic 
  

   series. 
  About 
  half 
  of 
  the 
  specimens 
  have 
  five 
  tentacles 
  in 
  each 
  

   interradial 
  cluster, 
  while 
  the 
  others 
  have 
  three. 
  There 
  are 
  large 
  

   specimens 
  in 
  each 
  class; 
  but 
  the 
  series, 
  as 
  a 
  whole, 
  suggests 
  that 
  

   most 
  examples, 
  at 
  any 
  rate, 
  attain 
  the 
  large 
  number 
  sooner 
  or 
  later. 
  

  

  In 
  the 
  Atlantic 
  form, 
  on 
  the 
  other 
  hand, 
  the 
  final 
  number 
  of 
  ten- 
  

   tacles 
  in 
  each 
  interradial 
  cluster 
  is 
  three, 
  and 
  no 
  specimens 
  have 
  

   ever 
  been 
  recorded 
  in 
  which 
  this 
  number 
  was 
  surj)assed. 
  Japanese 
  

   examples, 
  likewise, 
  have 
  only 
  three. 
  Each 
  of 
  the 
  radial 
  groups 
  has 
  

   five 
  tentacles, 
  Railikea 
  has 
  never 
  been 
  observed 
  with 
  more 
  than 
  five 
  

   in 
  each. 
  One 
  medusa 
  bud, 
  almost 
  ready 
  for 
  liberation, 
  the 
  only 
  one 
  

   found 
  at 
  so 
  late 
  a 
  stage, 
  has 
  five 
  tentacles 
  in 
  each 
  radial, 
  three 
  in 
  

   each 
  interradial, 
  group. 
  In 
  the 
  medusa 
  buds 
  of 
  the 
  Atlantic 
  race 
  

   there 
  are 
  usually 
  three 
  tentacles 
  in 
  each 
  radial 
  and 
  only 
  one 
  in 
  each 
  

   interradial 
  group 
  when 
  liberated, 
  AU 
  the 
  specimens 
  are 
  of 
  the 
  

   ''short 
  peduncle" 
  type; 
  indeed, 
  I 
  have 
  never 
  seen 
  one 
  of 
  the 
  ''grata" 
  

   type 
  (IMayer, 
  1910). 
  

  

  Color. 
  — 
  In 
  formalin 
  manubrium 
  tentacle 
  bulbs 
  are 
  pale 
  yellow. 
  

  

  Family 
  PANDEIDAE 
  Haeckel, 
  1879 
  (sens. 
  em.). 
  

   Family 
  TIARIDAE 
  1 
  Haeckel. 
  

  

  MEATOR, 
  new 
  genus. 
  

  

  This 
  new 
  genus 
  is 
  proposed 
  for 
  an 
  interesting 
  new 
  Pandeid 
  in 
  which 
  

   the 
  gonads 
  consist, 
  in 
  the 
  adult, 
  of 
  eight 
  smooth 
  adradial 
  masses, 
  dis- 
  

   continuous 
  in 
  the 
  perradii, 
  and 
  in 
  which 
  perradial 
  and 
  subradial 
  ten- 
  

   tacles 
  are 
  of 
  different 
  sizes, 
  though 
  structurally 
  all 
  alike, 
  characters 
  

   which 
  separate 
  it 
  from 
  all 
  other 
  members 
  of 
  the 
  family. 
  

  

  Tpye. 
  — 
  Meator 
  rubatra, 
  new 
  species. 
  

  

  MEATOR 
  RUBATRA, 
  new 
  species. 
  

  

  Plate 
  1, 
  figs. 
  1-3. 
  

  

  Type.— 
  C&t. 
  No. 
  31051, 
  U.S.N.M. 
  

  

  Station 
  4800, 
  300-0 
  fathoms; 
  2 
  specimens, 
  respectively 
  14 
  mm. 
  

   high 
  by 
  18 
  mm. 
  in 
  diameter 
  (type) 
  and 
  13 
  mm. 
  high 
  by 
  13 
  mm. 
  in 
  

   diameter. 
  

  

  Station 
  5019, 
  192-0 
  fathoms; 
  1 
  specimen, 
  17 
  mm. 
  high. 
  

  

  Station 
  5028, 
  241-0 
  fathoms; 
  1 
  specimen, 
  17 
  mm. 
  high. 
  

  

  Station 
  5030, 
  1,800-0 
  fathoms; 
  1 
  specimen, 
  17 
  mm. 
  high. 
  

  

  Station 
  5030, 
  300-0 
  fathoms; 
  7 
  specimens; 
  the 
  smallest 
  specimen 
  is 
  

   10 
  mm. 
  high 
  by 
  11 
  mm. 
  in 
  diameter, 
  the 
  largest 
  17 
  mm. 
  high 
  by 
  18 
  

   mm. 
  in 
  diameter. 
  

  

  All 
  are 
  in 
  excellent 
  condition. 
  

  

  Meator 
  rubatra 
  is 
  so 
  striking 
  in 
  its 
  general 
  appearance 
  that 
  it 
  can 
  

   not 
  be 
  mistaken 
  for 
  any 
  other 
  known 
  medusa. 
  The 
  gelatinous 
  sub- 
  

  

  ' 
  Untenable, 
  because 
  Tiara 
  is 
  preoccupied 
  for 
  a 
  moliusk. 
  

  

  