﻿NO. 
  194G. 
  PACIFIC 
  MEDUSAE 
  AND 
  SIPIIOXOPHORAE—BIGELOW. 
  75 
  

  

  is 
  divided 
  into 
  two 
  wings, 
  and 
  the 
  considerable 
  length 
  of 
  the 
  somato- 
  

   cjst. 
  The 
  latter 
  organ 
  is 
  fusiform 
  (never 
  globular 
  and 
  transverse 
  as 
  

   in 
  D. 
  fowleri 
  Bigelow) 
  and 
  usually 
  about 
  one-third 
  as 
  long 
  as 
  the 
  

   nectosac, 
  but 
  it 
  may 
  be 
  variously 
  contracted 
  (fig. 
  2) 
  with 
  preserva- 
  

   tion, 
  and 
  in 
  two 
  specimens 
  it 
  reaches 
  to 
  about 
  the 
  mid-level 
  of 
  the 
  

   nectosac; 
  its 
  normal 
  length 
  must 
  be 
  sought 
  in 
  living 
  material. 
  

  

  The 
  five 
  ridges 
  are 
  usually 
  perfectly 
  smooth 
  (fig. 
  2), 
  as 
  are 
  the 
  

   margins 
  of 
  the 
  hydroecial 
  opening, 
  but 
  in 
  a 
  few 
  specimens 
  slightly 
  

   wavy, 
  and 
  in 
  some 
  the 
  lateral 
  ridges 
  terminate 
  just 
  above 
  the 
  basal 
  

   margm. 
  But 
  this 
  is 
  not 
  invariable, 
  as 
  I 
  formerly 
  supposed, 
  for 
  in 
  

   others 
  the 
  ridges 
  can 
  be 
  followed 
  to 
  the 
  margin. 
  The 
  shape 
  of 
  the 
  

   hydroecium 
  shown 
  better 
  in 
  the 
  figures 
  (pi. 
  6, 
  fig. 
  5) 
  than 
  by 
  verbal 
  

   description, 
  is 
  extremely 
  characteristic. 
  

  

  The 
  specimens 
  agree 
  very 
  well 
  with 
  Sars's 
  figures 
  (1846, 
  pi. 
  7, 
  figs. 
  

   1-12). 
  Thus 
  he 
  shows 
  the 
  five 
  ridges 
  and 
  concave 
  facets, 
  and 
  the 
  

   moderately 
  long 
  fusiform 
  somatocyst, 
  and 
  his 
  figure 
  (fig. 
  2) 
  of 
  the 
  

   detached 
  superior 
  nectophore 
  is 
  especially 
  important 
  because 
  it 
  

   shows 
  a 
  very 
  shallow 
  hydroecium 
  entirely 
  below 
  the 
  opening 
  of 
  the 
  

   nectosac, 
  just 
  as 
  in 
  our 
  specimens 
  (in 
  his 
  figure 
  of 
  the 
  complete 
  

   colony, 
  the 
  hydroecium 
  is 
  obscured). 
  

  

  Inferior 
  nectopJiore. 
  — 
  The 
  lower 
  nectophore 
  (pi. 
  6, 
  fig. 
  3) 
  is 
  shorter 
  

   than 
  the 
  upper 
  one 
  (superior 
  18 
  mm., 
  inferior 
  12 
  mm.; 
  superior 
  24 
  

   mm., 
  inferior 
  17 
  mm.), 
  somewhat 
  quadrate 
  in 
  outline, 
  with 
  well- 
  

   marked 
  dorsal 
  and 
  lateral 
  ridges; 
  the 
  hydroecium, 
  open 
  from 
  end 
  to 
  

   end, 
  indeed 
  merely 
  a 
  furrow, 
  deep 
  near 
  the 
  apex, 
  very 
  shallow 
  at 
  the 
  

   base, 
  as 
  in 
  the 
  genus 
  Galeolcria. 
  It 
  resembles 
  that 
  genus, 
  too, 
  in 
  

   the 
  presence 
  of 
  a 
  single 
  basal 
  Iwdroecial 
  wing, 
  incised 
  in 
  a 
  character- 
  

   istic 
  way 
  in 
  its 
  mid 
  line, 
  the 
  right-hand 
  lobe 
  being 
  the 
  larger 
  (pi. 
  6, 
  

   fig. 
  4). 
  The 
  apex 
  of 
  the 
  bell, 
  too, 
  recalls 
  Galeolaria, 
  for 
  the 
  pedicu- 
  

   lar 
  canal 
  joins 
  the 
  nectosac 
  some 
  little 
  distance 
  below 
  its 
  apex. 
  

  

  One 
  specimen 
  shows 
  that 
  the 
  vascular 
  system 
  is 
  of 
  the 
  usual 
  

   Dlphyid 
  type. 
  

  

  Sars's 
  (1846) 
  figures 
  of 
  the 
  lower 
  nectophore 
  agree 
  with 
  the 
  above 
  

   in 
  general 
  form 
  and 
  give 
  a 
  very 
  clear 
  account 
  of 
  the 
  hydroecial 
  

   groove, 
  and 
  it 
  is 
  especially 
  important 
  that 
  he 
  shows 
  that 
  his 
  specimen 
  

   agreed 
  with 
  ours 
  in 
  the 
  outline 
  of 
  the 
  basal 
  wing 
  (particularly 
  in 
  his 
  

   side 
  view, 
  fig. 
  3), 
  and 
  apparently 
  in 
  the 
  course 
  of 
  the 
  lateral 
  canals 
  

   of 
  the 
  nectosac. 
  

  

  The 
  present 
  records 
  are 
  from 
  the 
  coasts 
  of 
  British 
  Columbia, 
  the 
  

   Bering 
  Sea 
  region, 
  and 
  the 
  Eastern 
  Sea 
  near 
  the 
  Goto 
  Islands. 
  The 
  

   previous 
  records 
  are 
  from 
  Norway 
  (Sars), 
  the 
  Bay 
  of 
  Biscay 
  (1911a), 
  

   the 
  eastern 
  tropical 
  Pacific 
  (19116), 
  and 
  the 
  Malaysian 
  region 
  (Lens 
  

   and 
  Van 
  Riemsdijk). 
  

  

  The 
  temperatures 
  at 
  which 
  it 
  has 
  been 
  taken 
  range 
  from 
  42° 
  (or 
  

   less?) 
  to 
  upward 
  of 
  80° 
  (Eastern 
  Sea, 
  Malaysia). 
  

  

  