﻿26 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  The 
  series 
  gives 
  the 
  following 
  data 
  : 
  

  

  > 
  About 
  13 
  contracted. 
  

  

  Most 
  of 
  the 
  specimens 
  are 
  in 
  such 
  excellent 
  condition 
  that 
  I 
  can 
  

   add 
  some 
  details 
  to 
  the 
  previous 
  accounts 
  of 
  this 
  interesting 
  species. 
  

   The 
  high, 
  domed 
  outline, 
  with 
  thick 
  gelatinous 
  substance, 
  is 
  char- 
  

   acteristic, 
  as 
  is 
  the 
  deep, 
  rather 
  narrow 
  bell 
  cavity. 
  The 
  precise 
  pro- 
  

   portions 
  of 
  the 
  bell 
  vary, 
  but 
  when 
  not 
  contracted 
  it 
  is 
  always 
  con- 
  

   siderably 
  higher 
  than 
  broad. 
  

  

  The 
  manubrium 
  is 
  more 
  or 
  less 
  contracted 
  in 
  all 
  the 
  examples. 
  In 
  

   one 
  specimen, 
  in 
  which 
  large 
  ova 
  are 
  v^isible, 
  the 
  gonads 
  are 
  slightly 
  

   wrinkled; 
  in 
  three 
  others, 
  apparently 
  males, 
  the 
  contraction 
  takes 
  the 
  

   form 
  of 
  more 
  regular 
  folds. 
  In 
  all 
  cases 
  the 
  sexual 
  masses 
  occupy 
  

   the 
  entire 
  interradial 
  areas, 
  from 
  the 
  base 
  of 
  the 
  manubrium 
  to 
  close 
  

   to 
  the 
  lip 
  ; 
  but 
  there 
  is 
  no 
  sexual 
  development 
  in 
  the 
  perradii. 
  One 
  

   specimen, 
  the 
  smallest, 
  has 
  no 
  gonads, 
  and 
  in 
  two 
  others 
  the 
  manu- 
  

   brium 
  is 
  lost. 
  Transverse 
  folding 
  of 
  the 
  gonads, 
  due 
  to 
  contraction, 
  

   is 
  also 
  usually 
  present 
  in 
  the 
  closely 
  allied 
  minor. 
  But 
  in 
  one 
  of 
  

   the 
  eastern 
  Pacific 
  specimens 
  of 
  anonyma, 
  a 
  female, 
  the 
  manubrium 
  

   was 
  smooth 
  (1 
  909a, 
  pi. 
  41 
  , 
  fig. 
  13) 
  . 
  This 
  fact 
  together 
  with 
  the 
  irregu- 
  

   larity 
  of 
  the 
  folding, 
  is 
  good 
  evidence 
  that 
  it 
  is 
  not 
  normal. 
  

  

  Tentacles. 
  — 
  The 
  Siboga 
  and 
  the 
  Valdivia 
  specimens 
  had 
  8 
  tentacles; 
  

   the 
  two 
  eastern 
  Pacific 
  examples 
  11 
  and 
  12, 
  respectively. 
  Vanhoffen 
  

   has 
  suggested 
  that 
  the 
  large 
  number 
  of 
  tentacles 
  in 
  the 
  latter 
  was 
  

   evidence 
  that 
  they 
  did 
  not 
  belong 
  to 
  anonyma, 
  but 
  the 
  present 
  series 
  

   shows 
  that 
  the 
  number 
  is 
  variable, 
  and 
  that 
  it 
  varies 
  independently 
  of 
  

   size. 
  Thus 
  the 
  two 
  specimens 
  21 
  mm. 
  high 
  have 
  only 
  7 
  tentacles 
  

   each, 
  while 
  specimens 
  of 
  13 
  and 
  20 
  mm. 
  have 
  8, 
  and 
  one 
  which, 
  judg- 
  

   ing 
  from 
  its 
  diameter, 
  was 
  probably 
  about 
  20 
  mm., 
  has 
  10. 
  Quadrant 
  

   by 
  quadrant, 
  as 
  well 
  as 
  from 
  individual 
  to 
  individual, 
  the 
  tentacles 
  

   vary 
  in 
  number. 
  Occasionally 
  there 
  is 
  no 
  interradial 
  tentacle 
  in 
  a 
  

   quadrant; 
  usually 
  there 
  is 
  1, 
  sometimes 
  there 
  are 
  2; 
  but 
  a 
  larger 
  

   number 
  has 
  never 
  been 
  observed, 
  and 
  consequently 
  we 
  have 
  reason 
  

   to 
  believe 
  that 
  a 
  total 
  of 
  12 
  is 
  the 
  normal 
  limit 
  in 
  this 
  species, 
  one, 
  

   however, 
  not 
  often 
  attained. 
  No 
  young 
  tentacles 
  have 
  ever 
  been 
  

   observed 
  in 
  anonyma; 
  but 
  whether 
  this 
  is 
  merely 
  a 
  comcidcnce 
  or 
  

   whether 
  it 
  means 
  that 
  the 
  final 
  number 
  for 
  anv 
  individual 
  is 
  attained 
  

  

  