﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  SIPHONOPHORAE—BIGELOW. 
  19 
  

  

  1 
  _ 
  __ 
  

  

  The 
  bases 
  of 
  the 
  tentacles 
  are 
  less 
  compressed 
  than 
  is 
  usual 
  in 
  

   Atlantic 
  vesicaria, 
  narrower, 
  and 
  do 
  not 
  clasp 
  the 
  exumbrella 
  to 
  the 
  

   same 
  degree. 
  

  

  The 
  margins 
  of 
  the 
  radial 
  canals 
  are 
  lobed 
  as 
  in 
  vesicaria; 
  the 
  cir- 
  

   cular 
  canal 
  is 
  slightly 
  wavy. 
  

  

  Color. 
  — 
  In 
  the 
  preserved 
  specimens 
  tentacles 
  and 
  manubrium 
  are 
  

   pale 
  yellow. 
  

  

  C. 
  vesicaria 
  is 
  known 
  from 
  the 
  coast 
  of 
  New 
  England, 
  from 
  the 
  

   Labrador 
  current, 
  Greenland, 
  and 
  Spitzbergen. 
  

  

  CATABLEMA 
  MULTICIRRATA 
  Klshinouye. 
  

   Catablema 
  vmlticirrata 
  Kishinouye, 
  1910, 
  p. 
  24. 
  

   Plate 
  1, 
  figs. 
  4-7. 
  

  

  Orca, 
  Prince 
  William 
  Sound, 
  Alaska, 
  July 
  19; 
  2 
  specimens, 
  both 
  

   in 
  good 
  anatomical 
  condition, 
  though 
  somewhat 
  contracted. 
  One 
  

   is 
  29 
  mm. 
  high 
  by 
  33 
  mm. 
  broad, 
  the 
  other 
  36 
  mm. 
  broad. 
  

  

  Dutch 
  Harbor, 
  Unalaska 
  Island, 
  Bering 
  Sea, 
  May 
  25; 
  2 
  young 
  

   specimens, 
  both 
  about 
  14 
  mm. 
  high 
  by 
  13 
  mm. 
  in 
  diameter. 
  

  

  In 
  the 
  smaller 
  of 
  the 
  two 
  adults, 
  which 
  is 
  the 
  least 
  contracted, 
  the 
  

   bell 
  is 
  nearly 
  cubical, 
  and 
  it 
  is 
  evident 
  that 
  in 
  life 
  there 
  was 
  a 
  con- 
  

   siderable 
  apical 
  dome, 
  now 
  represented 
  by 
  a 
  much 
  wrinkled 
  and 
  

   flattened 
  gelatinous 
  cap. 
  

  

  Manubrium 
  and 
  gonads. 
  — 
  The 
  manubrium, 
  like 
  the 
  bell, 
  is 
  cubical, 
  

   nearly 
  fills 
  the 
  cavity 
  of 
  the 
  bell, 
  and 
  is 
  attached 
  to 
  the 
  subum- 
  

   brella 
  along 
  the 
  perradii 
  (pi. 
  1, 
  fig. 
  4). 
  The 
  gastric 
  portion 
  of 
  the 
  

   manubrium 
  hangs 
  below 
  the 
  midlevel 
  of 
  the 
  bell 
  cavity, 
  and 
  the 
  

   lip, 
  primarily 
  quadratic, 
  is 
  complexly 
  folded, 
  much 
  more 
  so 
  than 
  in 
  

   any 
  recorded 
  specimen 
  of 
  vesicaria, 
  either 
  Atlantic 
  or 
  Pacific. 
  The 
  

   gonads 
  consist 
  of 
  four 
  series 
  of 
  folds, 
  occupying 
  nearly 
  the 
  whole 
  of 
  

   the 
  four 
  interradial 
  areas, 
  but 
  entirely 
  discontinuous 
  in 
  the 
  perradii, 
  

   even 
  below 
  the 
  level 
  to 
  which 
  the 
  manubrium 
  is 
  attached 
  to 
  the 
  sub- 
  

   umbrella. 
  In 
  the 
  center 
  of 
  each 
  interradius 
  the 
  folds 
  are 
  vertical; 
  

   near 
  the 
  perradii 
  they 
  become 
  somewhat 
  oblique, 
  just 
  as 
  in 
  vesicaria, 
  

   but 
  in 
  no 
  instance 
  were 
  they 
  transverse. 
  In 
  the 
  interradius 
  shown 
  

   in 
  the 
  photograph 
  (pi. 
  1, 
  fig. 
  4) 
  there 
  are 
  25 
  folds. 
  The 
  folds 
  vary 
  

   in 
  breadth 
  and 
  in 
  length, 
  but 
  in 
  neither 
  example 
  are 
  they 
  supple- 
  

   mented 
  by 
  the 
  irregular 
  knobs 
  and 
  swellings 
  wliicli 
  are 
  a 
  prominent 
  

   feature 
  in 
  tlie 
  gonads 
  of 
  the 
  Pacific 
  form 
  of 
  C. 
  vesicaria. 
  The 
  ridges 
  

   are 
  simple 
  folds 
  of 
  the 
  gastric 
  wall, 
  not 
  thickenings, 
  and 
  the 
  sexual 
  

   products, 
  large 
  ova 
  in 
  both 
  specimens, 
  are 
  developed 
  indifferently 
  

   over 
  the 
  ridges 
  and 
  in 
  the 
  valleys 
  which 
  separate 
  them. 
  But 
  few 
  

   if 
  an}^ 
  ova 
  are 
  to 
  be 
  seen 
  below 
  the 
  level 
  at 
  which 
  the 
  ridges 
  terminate, 
  

   and 
  none 
  at 
  all 
  along 
  a 
  rather 
  broad 
  band 
  marking 
  each 
  perradius. 
  

  

  Canals. 
  — 
  Tlie 
  canals, 
  botli 
  radial 
  and 
  circular, 
  are 
  very 
  broad 
  

   (pi. 
  1, 
  fig. 
  5). 
  Owing 
  to 
  the 
  large 
  size 
  of 
  the 
  manubrium, 
  the 
  radial 
  

  

  