﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  8IPH0N0PH0RAE—BIOEL0W. 
  85 
  

  

  111 
  a 
  slightly 
  older 
  specimen, 
  23 
  mm. 
  in 
  diameter, 
  the 
  ring 
  sinus, 
  

   lappet 
  canals, 
  and 
  the 
  surface 
  of 
  the 
  gonads 
  themselves 
  are 
  faintly 
  

   reddish; 
  in 
  other 
  words, 
  the 
  pigmentation 
  has 
  now 
  attained 
  prac- 
  

   tically 
  its 
  final 
  extent, 
  though 
  in 
  the 
  distal 
  regions 
  it 
  is 
  still 
  so 
  faint 
  

   that 
  the 
  gonads 
  are 
  visible 
  from 
  without. 
  

  

  Though 
  all 
  the 
  large 
  specimens 
  are 
  so 
  heavily 
  and 
  extensively 
  pig- 
  

   mented 
  that 
  their 
  identity, 
  as 
  Jiyadnthina, 
  is 
  at 
  once 
  apparent, 
  it 
  is 
  

   not 
  correct 
  to 
  say 
  that 
  the 
  gonads 
  are 
  always 
  rendered 
  invisible 
  from 
  

   without 
  by 
  the 
  pigment. 
  This 
  may 
  be 
  the 
  case; 
  for 
  example, 
  in 
  two 
  

   perfect 
  specimens 
  about 
  25 
  and 
  45 
  mm. 
  in 
  diameter 
  they 
  are 
  entirely 
  

   hidden. 
  But 
  in 
  another 
  of 
  40 
  mm. 
  in 
  equally 
  good 
  condition 
  the 
  

   gonads 
  show 
  plainly 
  from 
  without, 
  the 
  pigment 
  in 
  this 
  case 
  being 
  

   less 
  dense, 
  though 
  equally 
  extensive. 
  Again, 
  in 
  a 
  much 
  smaller 
  

   specimen 
  (27 
  mm.), 
  they 
  are 
  entirely 
  hidden; 
  in 
  one 
  of 
  36 
  mm. 
  

   their 
  distal 
  ends 
  plainly 
  visible, 
  though 
  the 
  pigment 
  has 
  attained 
  

   its 
  final 
  extent. 
  These 
  irregularities 
  show 
  that 
  there 
  is 
  considerable 
  

   indi\'idual 
  variation 
  in 
  the 
  density 
  of 
  the 
  pigment, 
  though 
  in 
  all 
  large 
  

   specimens 
  it 
  extends 
  over 
  the 
  ring 
  sinus 
  and 
  peripheral 
  canal 
  system. 
  

  

  General 
  form, 
  another 
  character 
  which 
  has 
  been 
  supposed 
  to 
  

   separate 
  liyacinthina 
  from 
  dodecahostrycha, 
  but 
  in 
  which, 
  as 
  I 
  have 
  

   pointed 
  out 
  (1909a), 
  no 
  sharp 
  division 
  line 
  can 
  be 
  drawn, 
  likewise 
  

   shows 
  much 
  individual 
  variation. 
  The 
  very 
  small 
  specimens 
  are 
  all 
  

   low 
  and 
  broad, 
  the 
  medium-sized 
  ones 
  proportfonately 
  higher, 
  usually 
  

   vAih 
  the 
  pointed 
  outlines, 
  with 
  pronounced 
  "stiel 
  canal. 
  " 
  But 
  there 
  

   is 
  much 
  variation, 
  the 
  extremes 
  being 
  a 
  specimen 
  40 
  mm. 
  in 
  diameter 
  

   and 
  50 
  mm. 
  high; 
  that 
  is, 
  with 
  proportions 
  in 
  terms 
  of 
  the 
  diameter, 
  

   of 
  1.25 
  : 
  1, 
  and 
  one 
  40 
  mm. 
  high 
  and 
  40 
  mm. 
  in 
  diameter. 
  None 
  of 
  

   these 
  specimens 
  are 
  proportionately 
  so 
  high 
  as 
  some 
  previously 
  

   recorded; 
  for 
  example, 
  Vanhoffen 
  mentions 
  examples 
  of 
  1.9 
  : 
  1, 
  and 
  

   1.7 
  : 
  1 
  (Bigelow, 
  1909a, 
  p. 
  25). 
  

  

  The 
  form 
  of 
  the 
  upper 
  part 
  of 
  the 
  gastric 
  cavity, 
  whether 
  rounded 
  

   or 
  conical, 
  seems 
  to 
  be 
  largely 
  a 
  question 
  of 
  contraction. 
  In 
  the 
  best 
  

   specimens, 
  which, 
  to 
  judge 
  from 
  their 
  condition, 
  must 
  have 
  been 
  alive 
  

   when 
  put 
  into 
  the 
  preservative, 
  it 
  is 
  of 
  the 
  latter, 
  in 
  the 
  more 
  

   damaged 
  ones, 
  of 
  the 
  former 
  type. 
  And 
  Jiyadnthina 
  with 
  low, 
  

   rounded 
  stomach 
  has 
  already 
  been 
  recorded 
  (1909a; 
  Vanhoffen, 
  

   1902a). 
  

  

  Family 
  NAUSITHOIDAE 
  Bigelow. 
  

  

  Family 
  EPHYROPSIDAE 
  » 
  Claus. 
  

  

  Genus 
  NAUSITHOE 
  Kolliker, 
  1853. 
  

   NAUSITHOfi 
  PUNCTATA 
  Kolliker. 
  

   Nausithoe 
  punctata 
  Kolliker, 
  1853a, 
  p. 
  323. 
  

  

  (For 
  synonymy, 
  see 
  Bigelow, 
  1909a, 
  p. 
  35; 
  Mayer, 
  1910, 
  p. 
  554.) 
  

   Station 
  4927, 
  surface; 
  2 
  specimens, 
  12 
  mm. 
  in 
  diameter. 
  

  

  1 
  Untenable, 
  because 
  Ephyropsis 
  Claus 
  is 
  a 
  synonym 
  of 
  Nausithoe 
  Kolliker. 
  

  

  