﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  8IPH0N0PH0RAE—BIGEL0W. 
  53 
  

  

  merely 
  evidence 
  of 
  contraction 
  or 
  of 
  individual 
  variation. 
  In 
  the 
  

   meantime 
  both 
  species 
  may 
  be 
  retained 
  provisionally. 
  

  

  Plate 
  4, 
  figs. 
  1^. 
  

  

  BOTRYNEMA 
  ELLINORAE 
  (Hartlaub). 
  

  

  Station 
  4760, 
  300-0 
  fathoms; 
  3 
  specimens, 
  10-13 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4763, 
  300-0 
  fathoms; 
  1 
  specimen, 
  11 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4764, 
  1130-0 
  fathoms; 
  1 
  specimen, 
  8 
  mm. 
  in 
  diameter. 
  

  

  The 
  specimens 
  are 
  more 
  or 
  less 
  fragmentary 
  except 
  one, 
  which 
  is 
  in 
  

   fairly 
  good 
  condition 
  except 
  that 
  most 
  of 
  the 
  tentacles 
  are 
  broken 
  

   short 
  off. 
  

  

  A 
  good 
  account 
  of 
  this 
  species, 
  wdth 
  excellent 
  figures, 
  has 
  been 
  

   given 
  by 
  Hartlaub. 
  

  

  Our 
  best 
  specimen 
  (pi. 
  4, 
  fig. 
  1) 
  is 
  13 
  mm. 
  m 
  diameter 
  by 
  about 
  

   9 
  mm. 
  high, 
  the 
  bell 
  cavity 
  moderately 
  deep, 
  the 
  gelatinous 
  sub- 
  

   stance 
  thin 
  at 
  the 
  margins, 
  but 
  thickened 
  to 
  form 
  a 
  rounded 
  prominence 
  

   or 
  knob 
  at 
  the 
  apex; 
  in 
  hrucei, 
  likewise, 
  there 
  is 
  a 
  gelatinous 
  knob. 
  

   Apparently 
  the 
  subumbrella 
  is 
  not 
  especially 
  muscular; 
  but 
  the 
  velum, 
  

   which 
  is 
  so 
  broad 
  that 
  it 
  fills 
  the 
  entire 
  opening 
  of 
  the 
  bell 
  in 
  the 
  pre- 
  

   served 
  state, 
  is 
  provided 
  with 
  an 
  imusually 
  well 
  developed 
  series 
  of 
  

   circular 
  fibers. 
  

  

  The 
  eight 
  radial 
  canals 
  are 
  broad 
  and 
  flat, 
  as 
  in 
  other 
  Halicreasidae, 
  

   and 
  the 
  corresponding 
  gonad 
  is 
  represented 
  on 
  each 
  one 
  by 
  a 
  broader 
  

   region 
  near 
  the 
  junction 
  with 
  the 
  manubrium. 
  Apparently 
  the 
  

   spechnens 
  are 
  all 
  immature, 
  for 
  the 
  walls 
  of 
  the 
  canals 
  in 
  the 
  sexual 
  

   regions 
  are 
  but 
  little 
  thickened 
  as 
  yet. 
  

  

  The 
  manubrium 
  is 
  broad, 
  shallow, 
  and 
  of 
  the 
  same 
  general 
  appear- 
  

   ance 
  as 
  in 
  other 
  Halicreasidae; 
  the 
  mouth, 
  wide 
  open 
  at 
  present, 
  is 
  

   surromided 
  by 
  a 
  simple, 
  unfolded, 
  circular 
  lip. 
  

  

  Marginal 
  organs. 
  — 
  The 
  margin 
  is 
  not 
  lobed 
  as 
  it 
  is 
  in 
  hrucei, 
  but 
  

   is 
  smooth, 
  just 
  as 
  Hartlaub 
  found 
  it. 
  There 
  are 
  8 
  single 
  perradial 
  

   tentacles 
  and 
  16 
  adradial 
  tentacle 
  groups 
  (pi. 
  4, 
  fig. 
  2), 
  with 
  from 
  7-11 
  

   tentacles 
  in 
  each 
  group, 
  and 
  tentacles 
  of 
  different 
  ages, 
  as 
  identi- 
  

   fied 
  by 
  the 
  length 
  of 
  their 
  stumps, 
  being 
  arranged 
  in 
  a 
  continuous 
  

   series, 
  the 
  oldest 
  at 
  one 
  end 
  of 
  the 
  group, 
  the 
  youngest 
  at 
  the 
  other. 
  

   In 
  the 
  groups 
  of 
  tentacles 
  flankuig 
  four 
  alternate 
  radial 
  canals, 
  the 
  

   oldest 
  tentacles 
  are 
  next 
  to 
  the 
  perradius; 
  in 
  the 
  other 
  four 
  paus 
  of 
  

   groups 
  the 
  youngest 
  (shortest) 
  tentacle 
  stumps 
  are 
  nearest 
  the 
  

   perradius. 
  Thus, 
  following 
  around 
  the 
  margin, 
  the 
  two 
  groups 
  in 
  

   any 
  octant 
  show 
  the 
  one, 
  those 
  in 
  the 
  next 
  octant 
  the 
  other 
  arrange- 
  

   ment. 
  And 
  this 
  same 
  arrangement 
  was 
  traced 
  by 
  Hartlaub. 
  In 
  

   hrucei 
  the 
  longest 
  basal 
  ends 
  are 
  next 
  the 
  perradius 
  in 
  the 
  group 
  

   figured 
  by 
  Browne 
  (1908), 
  "but 
  in 
  some 
  of 
  the 
  other 
  groups 
  the 
  short- 
  

   est 
  basal 
  end 
  occupies 
  tliis 
  position" 
  (Browoie, 
  1908, 
  p. 
  240). 
  It 
  was 
  

  

  Alloionema 
  ellinorae 
  Haetlaub, 
  1909a, 
  p. 
  8, 
  pi. 
  76, 
  figs. 
  3, 
  4, 
  6. 
  

  

  