﻿72 
  PROCEEDTXGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  all 
  but 
  the 
  basal 
  portion 
  of 
  the 
  stem 
  lost; 
  but 
  the 
  essential 
  features 
  

   of 
  the 
  somatocysts 
  and 
  nectophores 
  are 
  intact, 
  while 
  the 
  Philippine 
  

   specimen 
  (with 
  the 
  bells 
  separated) 
  is 
  in 
  excellent 
  condition. 
  In 
  

   the 
  complete 
  specimen 
  the 
  anterior 
  nectophore 
  is 
  13 
  mm. 
  long, 
  the 
  

   posterior 
  one 
  28 
  mm. 
  

  

  Anterior 
  nectophore. 
  — 
  The 
  suiface 
  of 
  the 
  anterior 
  bell 
  is 
  rounded, 
  

   with 
  no 
  ridges, 
  either 
  dorsal, 
  lateral, 
  or 
  ventral, 
  and 
  with 
  no 
  basal 
  

   teeth; 
  its 
  aj^ex 
  bluntly 
  pointed; 
  its 
  general 
  form 
  that 
  of 
  an 
  obhquely 
  

   truncate 
  cone 
  (pi. 
  6, 
  fig. 
  1). 
  There 
  is 
  a 
  shallow 
  hydroecium, 
  open 
  

   along 
  the 
  ventral 
  side 
  for 
  its- 
  whole 
  length, 
  and 
  reaching 
  nearly 
  to 
  the 
  

   mid-level 
  of 
  the 
  bell; 
  the 
  nectosac 
  is 
  large, 
  reaching 
  over 
  two-thirds 
  

   of 
  the 
  length 
  of 
  the 
  bell, 
  and 
  the 
  pedicular 
  canal 
  joins 
  it 
  at 
  one-tliird 
  

   of 
  its 
  height. 
  Only 
  the 
  proximal 
  ends 
  of 
  the 
  subumbral 
  canals 
  can 
  

   be 
  traced. 
  The 
  somatocyst 
  reaches 
  almost 
  to 
  the 
  apex; 
  its 
  proximal 
  

   half 
  is 
  narrow, 
  and 
  in 
  one 
  specimen 
  it 
  continues 
  thus, 
  though 
  wrinlded 
  

   and 
  twisted; 
  but 
  in 
  another 
  it 
  dilates 
  near 
  its 
  tip 
  (pi. 
  6, 
  fig. 
  1). 
  This 
  

   part 
  of 
  the 
  somatocyst 
  is 
  injured, 
  but 
  its 
  outlines 
  can 
  still 
  be 
  traced. 
  

  

  Posterior 
  nectophore. 
  — 
  The 
  surface 
  is 
  rounded, 
  -without 
  ridges; 
  the 
  

   opening 
  of 
  the 
  nectosac 
  oblique, 
  the 
  flaps 
  which 
  inclose 
  the 
  hydroe- 
  

   cium 
  are 
  separate 
  from 
  end 
  to 
  end, 
  though 
  the 
  left-hand 
  one 
  over- 
  

   laps 
  the 
  right 
  hand. 
  Below 
  the 
  level 
  of 
  the 
  opening 
  of 
  the 
  nectosac 
  

   the 
  dorsal 
  wall 
  of 
  the 
  hydroecium 
  is 
  prolonged 
  in 
  two 
  large 
  trian- 
  

   gular, 
  smooth-edged 
  teeth, 
  of 
  about 
  equal 
  length 
  (pi. 
  6, 
  fig.' 
  1), 
  and 
  

   these 
  are 
  shown 
  by 
  Lens 
  and 
  Van 
  Riemsdijk 
  (1908). 
  

  

  The 
  pedicular 
  canal 
  joins 
  the 
  nectosac 
  at 
  about 
  its 
  mid-level; 
  the 
  

   subumbral 
  canals 
  are 
  largely 
  destroyed. 
  The 
  most 
  interestmg 
  fea- 
  

   ture 
  of 
  the 
  posterior 
  nectophore 
  is, 
  of 
  course, 
  its 
  somatocyst. 
  This 
  

   structure 
  (pi. 
  6, 
  figs. 
  1, 
  2) 
  is 
  a 
  pear-shaped 
  outgrowth 
  of 
  the 
  pedicular 
  

   canal 
  close 
  to 
  the 
  apex 
  of 
  the 
  bell, 
  and 
  it 
  lies 
  close 
  to 
  the 
  dorsal 
  

   surface 
  of 
  the 
  hydroecium, 
  which 
  reaches 
  to 
  the 
  apex. 
  Lens 
  and 
  

   Van 
  Riemsdijk 
  likewise 
  observed 
  it 
  and 
  suspected 
  its 
  true 
  nature. 
  

  

  The 
  relationship 
  of 
  the 
  two 
  bells 
  to 
  each 
  other 
  and 
  to 
  the 
  stem 
  

   differs 
  in 
  detail 
  from 
  what 
  is 
  fomid 
  in 
  Galeolaria, 
  the 
  two 
  bells 
  being 
  

   less 
  intimately 
  connected, 
  and 
  the 
  stem 
  arismg 
  from 
  the 
  common 
  

   pedicular 
  canal 
  after 
  the 
  latter 
  has 
  joined 
  the 
  ventral 
  surface 
  of 
  the 
  

   posterior 
  nectophore 
  (pi. 
  6, 
  fig. 
  2). 
  The 
  result 
  of 
  this 
  is 
  that 
  when 
  

   the 
  two 
  nectophores 
  are 
  forcibly 
  separated 
  the 
  stem 
  remains 
  attached 
  

   to 
  the 
  posterior 
  one, 
  instead 
  of 
  to 
  the 
  anterior 
  as 
  in 
  the 
  Diphyopsinae. 
  

   This 
  phenomenon 
  makes 
  it 
  improbable 
  that 
  there 
  is 
  a 
  succession 
  of 
  

   nectophores 
  in 
  this 
  genus, 
  because 
  the 
  anatomy 
  of 
  the 
  parts 
  con- 
  

   cerned 
  suggests 
  that 
  if 
  either 
  bell 
  were 
  cast 
  off 
  it 
  would 
  be 
  the 
  

   anterior 
  one. 
  

  

  Stem 
  and 
  appendages. 
  — 
  L^nfortunately 
  only 
  the 
  basal 
  part 
  of 
  the 
  

   stem 
  is 
  preserved 
  in 
  any 
  specimen, 
  and 
  it 
  is 
  invariably 
  so 
  contracted 
  

  

  