﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  SIPIIONOPHORAE—BIGELOW. 
  

  

  43 
  

  

  Faroe 
  Channel 
  in 
  August, 
  1910, 
  between 
  1,000 
  and 
  500 
  meters, 
  for 
  

   which 
  I 
  have 
  to 
  thank 
  Doctor 
  Broch. 
  

  

  In 
  describing 
  the 
  Labrador 
  collection 
  I 
  used 
  the 
  name 
  rosea, 
  follow- 
  

   ing 
  Bro^\^le 
  (1903), 
  Maas 
  (19066), 
  and 
  Hartlaub 
  (1909a), 
  who 
  separate 
  

   rosea 
  with 
  eight 
  otocysts 
  from 
  digitale 
  with 
  four. 
  But 
  Mayer 
  (1910) 
  

   has 
  found 
  that 
  there 
  is 
  no 
  discontinuity 
  in 
  this 
  character, 
  because 
  

   specimens 
  may 
  normally 
  have 
  3, 
  4, 
  5, 
  6, 
  or 
  8, 
  and 
  all 
  the 
  large 
  speci- 
  

   mens 
  studied 
  b}" 
  me 
  have 
  6-8 
  otocysts, 
  if 
  those 
  organs 
  are 
  visible 
  at 
  

   all, 
  which 
  is 
  very 
  often 
  not 
  the 
  case. 
  The 
  otocysts 
  are 
  so 
  easily 
  

   detached 
  in 
  Aglantha 
  that 
  the 
  identification 
  of 
  many 
  of 
  the 
  collections 
  

   which 
  have 
  been 
  recorded 
  as 
  digitale 
  or 
  as 
  rosea 
  rests 
  on 
  no 
  more 
  

   certain 
  ground 
  than 
  size 
  or 
  geographic 
  location; 
  but 
  there 
  is 
  cer- 
  

   tainly 
  no 
  correlation 
  between 
  size 
  and 
  number 
  of 
  otocysts, 
  for 
  I 
  have 
  

   seen 
  specimens 
  from 
  29-30 
  mm. 
  high, 
  as 
  well 
  as 
  some 
  with 
  large 
  gonads 
  

   of 
  only 
  10-15 
  mm, 
  with 
  eight 
  of 
  these 
  organs 
  (1909c). 
  For 
  these 
  

   reasons 
  it 
  is 
  probable 
  that 
  Mayer 
  (1910) 
  was 
  justified 
  in 
  uniting 
  the 
  

   two 
  species, 
  and 
  I 
  therefore 
  follow 
  him, 
  referring 
  the 
  present 
  col- 
  

   lection 
  to 
  digitale. 
  But 
  revision, 
  which 
  the 
  genus 
  is 
  in 
  urgent 
  need 
  of, 
  

   will 
  probably 
  show 
  that 
  the 
  latter 
  has 
  several 
  size-varieties. 
  

  

  AGLANTHA 
  DIGITALE 
  (Fabricius) 
  Haeckel. 
  

   Medusa 
  digitale 
  Fabricius, 
  1780, 
  p. 
  366. 
  

  

  (For 
  synonymy, 
  see 
  Mayer, 
  1910, 
  p. 
  402.) 
  

  

  The 
  species 
  was 
  taken 
  at 
  the 
  following 
  stations: 
  4758, 
  4759, 
  4760, 
  

   Dutch 
  Harbor, 
  4762, 
  4763, 
  4766, 
  4767, 
  4775, 
  4783, 
  4785^ 
  4793, 
  4797, 
  

   4800, 
  4805, 
  4806, 
  4810, 
  4818, 
  4819, 
  4820, 
  4830, 
  4831, 
  4847, 
  4866, 
  5030, 
  

   both 
  on 
  the 
  surface 
  and 
  in 
  hauls 
  with 
  open 
  nets 
  from 
  300 
  fathoms. 
  

   The 
  series 
  consists 
  of 
  about 
  300 
  specimens 
  ranging 
  in 
  height 
  from 
  

   8-25 
  mm. 
  

  

  The 
  few 
  specimens 
  which 
  were 
  in 
  good 
  enough 
  condition 
  to 
  show 
  the 
  

   otocysts 
  afforded 
  the 
  following 
  data: 
  

  

  In 
  all 
  of 
  these 
  specimens, 
  as 
  in 
  the 
  Labrador 
  series, 
  the 
  course 
  of 
  

   the 
  radial 
  canals 
  is 
  direct, 
  instead 
  of 
  in 
  an 
  S 
  curve, 
  as 
  it 
  was 
  in 
  the 
  

   specimens 
  from 
  the 
  intermediate 
  waters 
  of 
  the 
  eastern 
  tropical 
  

   Pacific 
  (y&t. 
  intermedia, 
  1909cr). 
  There 
  seems 
  to 
  be 
  normally 
  one 
  

   otocyst 
  to 
  the 
  octant; 
  but 
  some 
  otocysts 
  may 
  lack 
  them 
  in 
  specimens 
  

   so 
  good 
  that 
  we 
  can 
  not 
  assume 
  that 
  they 
  were 
  present 
  but 
  are 
  lost, 
  

   and 
  this 
  same 
  phenomenon 
  is 
  recorded 
  by 
  Mayer. 
  

  

  