﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  8IPH0N0PH0RAE—BIGEL0W. 
  87 
  

  

  Station 
  4766, 
  300-0 
  fathoms; 
  7 
  specimens. 
  

  

  Station 
  4767, 
  300-0 
  fathoms; 
  4 
  specimens. 
  

  

  Station 
  4773, 
  300-0 
  fathoms; 
  2 
  specimens. 
  

  

  Station 
  4780, 
  1046-0 
  fathoms; 
  1 
  specimen. 
  

  

  Station 
  4917, 
  361-0 
  fathoms; 
  1 
  specimen. 
  

  

  Station 
  5058, 
  300-0 
  fathoms; 
  3 
  specimens. 
  

  

  Station 
  5063, 
  300-0 
  fathoms; 
  2 
  specimens. 
  

  

  Station 
  5064, 
  300-0 
  fathoms; 
  3 
  specimens. 
  

  

  Station 
  5079, 
  300-0 
  fathoms- 
  1 
  specimen. 
  

  

  Also 
  — 
  

  

  Station 
  3009, 
  Gulf 
  of 
  California, 
  857-0 
  fathoms; 
  2 
  specimens. 
  

  

  Station 
  3070, 
  off 
  the 
  coast 
  of 
  Oregon; 
  636-0 
  fathoms; 
  1 
  specimen. 
  

  

  Station 
  3071, 
  off 
  the 
  coast 
  of 
  Oregon, 
  685-0 
  fathoms; 
  2 
  specimens. 
  

  

  These 
  specimens 
  are 
  aU 
  in 
  such 
  good 
  condition 
  that 
  it 
  is 
  easy 
  to 
  

   see 
  that 
  they 
  belong 
  to 
  wyvillei; 
  but 
  22 
  damaged 
  AtoUas, 
  taken 
  at 
  

   stations 
  4767, 
  4774, 
  4906, 
  4907, 
  4908, 
  4909, 
  4917, 
  4919, 
  4957, 
  5063, 
  

   in 
  the 
  trawl, 
  show 
  no 
  furrows 
  clearly; 
  though 
  judging 
  from 
  their 
  

   general 
  condition 
  it 
  is 
  probable 
  that 
  the 
  absence 
  is 
  due 
  to 
  rubbing 
  in 
  

   the 
  net. 
  

  

  Several 
  of 
  the 
  undoubted 
  wyvillei 
  are 
  in 
  beautiful 
  condition. 
  

  

  In 
  the 
  eastern 
  Pacific 
  specimens 
  there 
  was 
  considerable 
  variation 
  

   in 
  the 
  breadth 
  of 
  the 
  furrows, 
  wliich 
  were 
  usually 
  broad 
  in 
  large, 
  

   narrow 
  in 
  small, 
  specimens. 
  And 
  in 
  a 
  general 
  way 
  the 
  same 
  is 
  true 
  

   of 
  the 
  present 
  series. 
  But 
  the 
  furrows 
  vary 
  so 
  much 
  in 
  the 
  large 
  

   specimens, 
  and 
  ever 
  in 
  a 
  given 
  specimen, 
  that 
  no 
  sharp 
  line 
  can 
  be 
  

   drawn 
  between 
  specimens 
  in 
  which 
  they 
  are 
  broad 
  and 
  those 
  in 
  which 
  

   they 
  are 
  narrow. 
  

  

  The 
  size 
  of 
  the 
  septal 
  nodes 
  has 
  been 
  used 
  as 
  the 
  chief 
  distinguishing 
  

   character 
  between 
  vaMiviae 
  and 
  hairdii 
  (Vanhoffen, 
  1902a); 
  and 
  it 
  is 
  

   therefore 
  interestiag 
  that 
  these 
  organs 
  vary 
  in 
  size 
  and 
  proportions 
  

   in 
  the 
  present 
  series. 
  Thus 
  in 
  a 
  specimen 
  70 
  mm. 
  in 
  diameter 
  the 
  

   nodes 
  are 
  9 
  mm. 
  long 
  and 
  5 
  mm. 
  broad, 
  while 
  in 
  another 
  of 
  about 
  

   the 
  same 
  size 
  (71 
  mm.), 
  they 
  are 
  12 
  mm. 
  long 
  by 
  3 
  mm. 
  broad; 
  that 
  

   is, 
  proportionately 
  only 
  about 
  half 
  as 
  broad 
  in 
  the 
  latter 
  as 
  in 
  the 
  

   former. 
  In 
  other 
  examples 
  intermediates 
  are 
  to 
  be 
  seen. 
  In 
  vaMiviae, 
  

   according 
  to 
  Vanhoffen's 
  figure 
  (1902a, 
  pi. 
  6, 
  fig. 
  41), 
  the 
  septal 
  nodes 
  

   are 
  about 
  two-thirds 
  as 
  broad 
  as 
  long; 
  that 
  is, 
  only 
  slightly 
  broader 
  

   than 
  in 
  our 
  70 
  mm. 
  specimen. 
  

  

  A 
  now 
  character 
  was 
  described 
  for 
  hairdiihy 
  Maas 
  (1904&), 
  namely, 
  

   the 
  occurrence 
  of 
  septal 
  regions 
  subdividing 
  the 
  tentacular 
  canals, 
  

   and 
  in 
  many 
  of 
  our 
  specimens 
  there 
  are 
  clear 
  oval 
  regions 
  in 
  the 
  

   tentacular 
  canals 
  which 
  look 
  like 
  septa. 
  But 
  it 
  is 
  easy 
  to 
  demonstrate 
  

   that 
  there 
  is 
  no 
  discontinuity 
  in 
  the 
  cavity; 
  and 
  the 
  copepods 
  which 
  

   are 
  so 
  often 
  seen 
  in 
  the 
  canals 
  are 
  as 
  apt 
  to 
  lie 
  in 
  these 
  false 
  septa 
  

  

  