﻿74 
  

  

  PBOCEEDn'OS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  The 
  scries 
  described 
  below 
  is 
  especially 
  interesting 
  because 
  it 
  shows 
  

   that 
  the 
  siphonophore 
  described 
  by 
  me 
  from 
  the 
  Bay 
  of 
  Biscay 
  

   (1911a) 
  and 
  from 
  the 
  eastern 
  tropical 
  Pacific 
  (191 
  1&) 
  as 
  " 
  Muggiaea 
  

   IcocMi" 
  is 
  not 
  a 
  Monophyid 
  but 
  a 
  Diphyid, 
  and 
  the 
  structure 
  of 
  the 
  

   inferior 
  nectophore 
  as 
  well 
  as 
  of 
  the 
  superior 
  one 
  identifies 
  it 
  posi- 
  

   tively 
  with 
  the 
  Diphyes 
  truncata 
  of 
  Sars 
  (1846). 
  

  

  The 
  Diphyes 
  suhtiloides 
  of 
  Lens 
  and 
  Van 
  Riemsdijk 
  (1908) 
  is 
  

   almost 
  certainly 
  identical, 
  for 
  their 
  figures 
  of 
  its 
  superior 
  nectophore 
  

   agree 
  very 
  well 
  with 
  small 
  specimens 
  in 
  the 
  Albatross 
  series, 
  espe- 
  

   cially 
  in 
  the 
  shallowness 
  of 
  the 
  liydroe- 
  

   cium 
  and 
  length 
  of 
  the 
  somatocyst. 
  

   They 
  did 
  not 
  find 
  its 
  inferior 
  nectophore. 
  

   Sars's 
  species 
  has 
  usually 
  been 
  called 
  a 
  

   Galeolaria; 
  hut 
  the 
  structure 
  of 
  the 
  upper 
  

   nectophore 
  suggests 
  that 
  it 
  belongs 
  to 
  

   the 
  Diphyopsinae, 
  though 
  further 
  data 
  

   on 
  the 
  appendages 
  (that 
  is, 
  whether 
  or 
  

   not 
  they 
  are 
  set 
  free 
  as 
  eudoxids) 
  is 
  

   needed 
  to 
  settle 
  the 
  question. 
  

  

  It 
  is 
  not 
  clear 
  whether 
  or 
  not 
  I 
  was 
  

   correct 
  in 
  believing 
  that 
  my 
  Biscayan 
  

   and 
  eastern 
  Pacific 
  specimens 
  belonged 
  

   to 
  the 
  same 
  species 
  as 
  the 
  Muggiaea 
  

   Icochii 
  of 
  Chun, 
  for 
  the 
  latter 
  is 
  insuffi- 
  

   ciently 
  described, 
  and 
  the 
  same 
  is 
  true 
  

   of 
  Dipliyes 
  Jcocliii 
  Will 
  (1844). 
  Should 
  

   all 
  finally 
  be 
  united. 
  Will's 
  name 
  would, 
  

   of 
  course, 
  take 
  precedence. 
  

  

  Dipliyes 
  truncata 
  is 
  represented 
  in 
  the 
  

   collection 
  by 
  3 
  pairs 
  of 
  nectophores 
  (now 
  

   separated, 
  but 
  connected 
  when 
  taken), 
  

   32 
  loose 
  superior 
  nectophores, 
  and 
  1 
  

   loose 
  posterior 
  one, 
  all 
  in 
  fairly 
  good 
  

   condition, 
  from 
  stations 
  4759, 
  4760, 
  4763, 
  4766, 
  4767, 
  4775, 
  4785, 
  

   4793, 
  4797, 
  4896, 
  4955; 
  and 
  by 
  a 
  considerable 
  number 
  of 
  nectophores, 
  

   both 
  superior 
  and 
  inferior, 
  from 
  station 
  4757, 
  which 
  were 
  presei-ved 
  

   in 
  alcohol, 
  and 
  are 
  now 
  so 
  flattened 
  and 
  distorted 
  that 
  they 
  are 
  use- 
  

   less 
  for 
  description, 
  though 
  their 
  identity 
  is 
  evident. 
  

  

  Superior 
  nectophore. 
  — 
  Nectophores 
  3-4 
  mm. 
  long 
  were 
  taken 
  at 
  

   stations 
  4896 
  and 
  4955; 
  the 
  others 
  range 
  in 
  length 
  from 
  13 
  to 
  28 
  mm. 
  

   The 
  distinctive 
  characters 
  of 
  the 
  superior 
  nectophore, 
  as 
  I 
  have 
  

   pointed 
  out 
  elsewhere 
  (19116), 
  are 
  the 
  presence 
  of 
  five 
  ridges 
  from 
  

   the 
  apex; 
  the 
  very 
  shallow 
  hydroecium 
  lying 
  wholly 
  below 
  the 
  open- 
  

   ing 
  of 
  the 
  nectosac; 
  the 
  fact 
  that 
  the 
  dorsal 
  wall 
  of 
  the 
  hydroecium 
  

  

  Fig. 
  2.— 
  Diphyes 
  truncata, 
  anterior 
  

   nectophore, 
  x 
  5. 
  

  

  