﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  SIPHONOPHORAE—BIGELOW. 
  41 
  

  

  much 
  less 
  numerous 
  than 
  the 
  canals; 
  for 
  example, 
  in 
  the 
  larger 
  

   specimen 
  there 
  were 
  only 
  10 
  hps 
  corresponding 
  to 
  37 
  canals. 
  

  

  Gonads. 
  — 
  Each 
  canal 
  bears 
  a 
  well 
  developed 
  gonad. 
  

  

  Color. 
  — 
  No 
  pigment 
  is 
  evident, 
  but 
  it 
  may 
  have 
  been 
  destroyed 
  by 
  

   })reservation. 
  

  

  AEQUOREA 
  PENSILE 
  (Modeer) 
  Haeckel. 
  

   Medtisa 
  pensile 
  Modeer, 
  1791, 
  p. 
  32. 
  

  

  (For 
  synonymy, 
  see 
  Mayer, 
  1910, 
  p. 
  333.) 
  

  

  Station 
  4961, 
  33-0 
  fathoms; 
  9 
  rather 
  fragmentary 
  specimens, 
  

   25-45 
  mm. 
  in 
  diameter. 
  

  

  The 
  greater 
  part 
  of 
  the 
  margin 
  is 
  torn 
  off 
  in 
  all 
  of 
  the 
  specimens, 
  

   so 
  that 
  it 
  is 
  impossible 
  to 
  count 
  the 
  tentacles; 
  but 
  on 
  the 
  portions 
  

   which 
  are 
  intact 
  there 
  are 
  10-12 
  canals 
  between 
  every 
  two 
  tentacles, 
  

   and 
  the 
  tentacular 
  bases 
  are 
  broad, 
  extending 
  more 
  or 
  less 
  along 
  the 
  

   bell 
  margin. 
  In 
  these 
  respects, 
  as 
  well 
  as 
  in 
  having 
  a 
  large 
  number 
  

   of 
  canals, 
  a 
  very 
  thick 
  lenticular 
  disk, 
  and 
  in 
  the 
  absence 
  of 
  excre- 
  

   tory 
  papillae, 
  which, 
  of 
  course, 
  I 
  specially 
  sought, 
  the 
  specimens 
  agree 
  

   with 
  better 
  preserved 
  examples 
  of 
  pensile 
  from 
  the 
  Philippines. 
  

  

  Order 
  TRACHOMEDUSAE. 
  

  

  Family 
  PETASIDAE 
  Haeckel, 
  1879. 
  (Browne, 
  1904; 
  Bigelow, 
  

   1909a.) 
  

  

  Genus 
  OLINDIOIDES 
  Goto, 
  1903. 
  

  

  OLINDIOIDES 
  FORMOSA 
  Goto. 
  

  

  Olindioides 
  formosa 
  Goto, 
  1903, 
  p. 
  3, 
  pi. 
  1, 
  figs. 
  1-9; 
  pi. 
  2, 
  figs. 
  14-16; 
  pi. 
  3, 
  figs. 
  

   17-20.— 
  Maas, 
  1909, 
  p. 
  29.— 
  Mayer, 
  1910, 
  p. 
  358. 
  

  

  Station 
  4883, 
  surface 
  ?; 
  1 
  specimen, 
  50 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4884, 
  53-0 
  fathoms; 
  11 
  specimens, 
  32-110 
  mm. 
  in 
  diameter. 
  

  

  Station 
  4885, 
  53-0 
  fathoms; 
  2 
  specimens, 
  45 
  and 
  125 
  mm. 
  in 
  

   diameter. 
  

  

  These 
  few 
  specimens 
  agree 
  very 
  well 
  with 
  the 
  excellent 
  accounts 
  

   of 
  much 
  larger 
  series 
  given 
  by 
  Goto 
  and 
  by 
  Maas. 
  

  

  Family 
  PTYCHOGASTRIDAE 
  Mayer, 
  1910. 
  

   Genus 
  PTYCHOGASTRIA 
  Allman, 
  1878. 
  

  

  PTYCHOGASTRIA 
  POLARIS 
  Allman. 
  

  

  Ptychogastria 
  polaris 
  ALLMA^f, 
  1878, 
  p. 
  290. 
  — 
  Browne, 
  1903, 
  p. 
  24, 
  pi. 
  4, 
  figs. 
  1, 
  2; 
  

  

  pi. 
  5, 
  figs. 
  6, 
  8.— 
  Bigelow, 
  1909c, 
  p. 
  310. 
  

   Pectyllis 
  arctica 
  Haeckel, 
  1879, 
  p. 
  266; 
  1881, 
  p. 
  11, 
  pis. 
  3, 
  4. 
  

  

  (For 
  full 
  synonymy, 
  see 
  Mayer, 
  1910, 
  p. 
  372.) 
  

  

  Station 
  4781 
  (Bering 
  Sea), 
  30-0 
  fathoms; 
  7 
  specimens, 
  10-18 
  mm. 
  

   in 
  diameter; 
  much 
  contracted. 
  

  

  