﻿16 
  

  

  PROCEEDINOS 
  OF 
  THE 
  NATIOXAL 
  MUSEUM. 
  

  

  The 
  basal 
  bulbs 
  are 
  large, 
  conical, 
  not 
  laterally 
  flattened, 
  and 
  

   clasp 
  the 
  exiimbrella 
  (pi. 
  2, 
  fig. 
  4). 
  

  

  Color. 
  — 
  In 
  the 
  largest 
  specimen 
  the 
  entire 
  subumbrella 
  is 
  deeply 
  

   pigmented, 
  of 
  a 
  deep 
  brownish-red, 
  less 
  opaque, 
  however, 
  than 
  in 
  

   Meator 
  rubatra, 
  the 
  radial 
  canals 
  causing 
  pale 
  bands. 
  The 
  ten- 
  

   tacles 
  are 
  of 
  the 
  same 
  color, 
  and 
  manubrium, 
  lips, 
  and 
  gonads 
  are 
  of 
  

   a 
  duller 
  brownish-red, 
  but 
  equally 
  strongly 
  pigmented. 
  In 
  the 
  

   specimen 
  47 
  mm. 
  high 
  the 
  tentacles 
  are 
  faint 
  reddish, 
  but 
  the 
  

   pigmentation 
  in 
  this 
  example 
  is 
  much 
  paler 
  in 
  general, 
  probably 
  due 
  

   to 
  the 
  poor 
  condition 
  of 
  the 
  subumbrella. 
  

  

  In 
  two 
  of 
  the 
  smaller 
  specimens, 
  which 
  are 
  in 
  fair 
  condition, 
  the 
  

   dense 
  pigment 
  ceases 
  some 
  distance 
  above 
  the 
  margin, 
  and 
  is 
  suc- 
  

   ceeded 
  there 
  by 
  a 
  clear 
  zone, 
  only 
  faintly 
  reddish 
  next 
  the 
  radial 
  

   canals, 
  and 
  with 
  the 
  tentacles 
  colorless. 
  

  

  2. 
  YOUNG 
  STAGES. 
  

  

  • 
  Approximate. 
  

  

  In 
  general 
  form, 
  voluminous 
  bell 
  cavity, 
  and 
  thin 
  gelatinous 
  

   substance, 
  these 
  small 
  specimens 
  agree 
  very 
  well 
  Avith 
  the 
  large 
  ones 
  

   described 
  above, 
  and 
  manubrium 
  and 
  lips 
  (pi. 
  2, 
  figs. 
  6, 
  7) 
  are 
  of 
  the 
  

   same 
  type; 
  but 
  the 
  gonads, 
  as 
  would 
  be 
  expected, 
  are 
  less 
  advanced, 
  

   the 
  network 
  being 
  less 
  prominent, 
  the 
  ridges 
  lower, 
  and 
  the 
  inter- 
  

   vening 
  hollows 
  shallower. 
  They 
  are, 
  however, 
  of 
  the 
  same 
  general 
  

   structure, 
  and 
  it 
  is 
  especially 
  interesting 
  that 
  they 
  occupy 
  the 
  entire 
  

   interradial 
  regions 
  just 
  as 
  they 
  do 
  in 
  the 
  larger 
  specimens. 
  Thus 
  

   there 
  is 
  no 
  evidence 
  that 
  the 
  network 
  is 
  derived 
  from 
  a 
  primarily 
  

   horseshoe-shaped 
  sexual 
  swelling, 
  as 
  it 
  is 
  in 
  Pandea 
  conica. 
  The 
  

   margins 
  of 
  the 
  radial 
  canals 
  are 
  slightly 
  wavy, 
  that 
  of 
  the 
  circular 
  

   canal 
  smooth. 
  

  

  There 
  are 
  fewer 
  tentacles 
  than 
  in 
  the 
  large 
  specimens, 
  three 
  being 
  

   the 
  most 
  in 
  any 
  quadrant, 
  with 
  a 
  total 
  of 
  14 
  in 
  the 
  example 
  shown 
  

   in 
  the 
  photograph, 
  but 
  the 
  conical 
  basal 
  bulbs 
  are 
  already 
  well 
  

   developed. 
  

  

  The 
  pigmentation, 
  instead 
  of 
  extending 
  to 
  the 
  subumbrella 
  as 
  in 
  the 
  

   adult, 
  is 
  limited 
  to 
  the 
  manubrium, 
  which, 
  with 
  its 
  lips 
  and 
  gonads, 
  

   is 
  of 
  a 
  deep 
  brownish-red. 
  This 
  difference 
  is 
  a 
  striking 
  one; 
  but 
  the 
  

   fact 
  that 
  the 
  adults 
  show 
  a 
  progressive 
  development 
  of 
  pigment, 
  

   which 
  does 
  not 
  reach 
  to 
  the 
  margin 
  anrl 
  tentacles 
  until 
  a 
  height 
  of 
  

   47 
  mm. 
  is 
  attained, 
  is 
  good 
  evidence 
  that 
  the 
  conditions 
  in 
  the 
  two 
  

   specimens 
  now 
  under 
  discussion 
  is 
  merely 
  an 
  earlier 
  stage 
  in 
  growth. 
  

  

  