﻿62 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  though 
  the 
  others 
  are 
  all 
  more 
  or 
  less 
  battered, 
  their 
  margins 
  are 
  

   well 
  enough 
  preserved 
  to 
  afford 
  the 
  following 
  data: 
  

  

  The 
  previous 
  records 
  are 
  : 
  

  

  23 
  (?) 
  mm,, 
  3 
  secondary 
  tentacles 
  per 
  octant 
  (Maas, 
  "Monaco"). 
  

  

  35-45 
  mm., 
  3 
  secondary 
  tentacles 
  per 
  octant 
  (Maas, 
  Sihoga). 
  

  

  16-21 
  mm., 
  usually 
  3 
  secondary 
  tentacles 
  per 
  octant 
  (Bigelow, 
  

   1909a, 
  Albatross). 
  

  

  8 
  and 
  16 
  mm., 
  3 
  secondary 
  tentacles 
  per 
  octant 
  (Vanlioffen, 
  1908, 
  

   var. 
  munda). 
  

  

  Diam. 
  ?, 
  5 
  secondary 
  tentacles 
  per 
  octant 
  (Vanhoffen, 
  1908, 
  

   guinensis). 
  

  

  34 
  mm., 
  4 
  secondary 
  tentacles 
  per 
  octant 
  (Yanhoffen, 
  1908, 
  

   ohscura. 
  

  

  The 
  value 
  of 
  these 
  records 
  must 
  be 
  modified 
  by 
  the 
  statement 
  that 
  

   the 
  margin 
  in 
  the 
  "Monaco" 
  specimen, 
  and 
  most 
  of 
  the 
  Albatross 
  

   eastern 
  Pacific 
  ones, 
  was 
  in 
  such 
  poor 
  condition 
  that 
  the 
  counts 
  

   given 
  are 
  only 
  approximate. 
  Some 
  of 
  the 
  octants 
  of 
  the 
  latter 
  could 
  

   not 
  be 
  counted 
  at 
  all, 
  and 
  in 
  others 
  some 
  of 
  the 
  secondary 
  tentacles 
  

   may 
  have 
  been 
  lost. 
  

  

  Vanhoffen's 
  definition 
  of 
  the 
  various 
  species 
  is: 
  wdth 
  3 
  secondary 
  

   tentacles 
  to 
  the 
  octant, 
  grimaldii;. 
  with 
  4, 
  obscura; 
  wdth 
  5, 
  guinensis. 
  

   But 
  the 
  present 
  series 
  shows 
  that 
  it 
  is 
  impossible 
  to 
  draw 
  any 
  such 
  

   lines, 
  because 
  a 
  single 
  specimen 
  may 
  show 
  all 
  three 
  conditions 
  on 
  

   different 
  parts 
  of 
  the 
  margin; 
  that 
  is, 
  its 
  individual 
  antimeres, 
  on 
  this 
  

   system, 
  would 
  belong 
  to 
  different 
  species. 
  The 
  number 
  of 
  secondary 
  

   tentacles 
  increases 
  with 
  growth, 
  but 
  very 
  irregularly. 
  Thus 
  the 
  

   largest 
  number 
  observed 
  for 
  any 
  antimere, 
  5, 
  occurs 
  in 
  a 
  specimen 
  of 
  

   only 
  22 
  mm., 
  as 
  well 
  as 
  in 
  the 
  largest, 
  while 
  the 
  only 
  one 
  which 
  has 
  

   3 
  in 
  3 
  successive 
  octants 
  is 
  27 
  mm. 
  in 
  diameter. 
  Nor 
  is 
  it 
  safe 
  to 
  

   assume 
  that 
  more 
  than 
  5 
  may 
  not 
  be 
  developed. 
  

  

  The 
  general 
  rule, 
  according 
  to 
  both 
  Maas 
  and 
  Vanhoffen, 
  is 
  that 
  

   there 
  is 
  an 
  otocyst 
  on 
  either 
  side 
  of 
  each 
  secondary 
  tentacle; 
  and 
  

   that 
  is 
  the 
  case 
  in 
  the 
  present 
  series 
  wherever 
  the 
  otocysts 
  are 
  intact. 
  

   But 
  in 
  no 
  specimen 
  could 
  I 
  count 
  them 
  even 
  over 
  the 
  whole 
  of 
  a 
  

   single 
  antimere. 
  

  

  In 
  the 
  largest 
  specimen, 
  one 
  in 
  which 
  the 
  central 
  gastric 
  system 
  is 
  

   well 
  preserved, 
  the 
  interradial 
  incisions 
  between 
  the 
  gastric 
  pockets 
  

   are 
  fully 
  twice 
  as 
  deep 
  as 
  the 
  incisions 
  in 
  the 
  perradii, 
  a 
  discrepancy 
  

  

  