﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  SIPHONOPHORAE—BIGELOW. 
  93 
  

  

  by 
  the 
  fact 
  that 
  the 
  rhopalar 
  lappets 
  are 
  scarcely 
  marked 
  off, 
  by 
  the 
  

   structure 
  of 
  the 
  rhopalia, 
  and 
  by 
  the 
  structure 
  of 
  the 
  circular 
  muscu- 
  

   lature 
  of 
  the 
  subumbrella, 
  which 
  is 
  separated 
  into 
  16 
  blocks 
  by 
  

   broad 
  gelatinous 
  ridges, 
  a 
  condition 
  different 
  from 
  that 
  in 
  capillata, 
  

   arctica, 
  and 
  lamarcJcii, 
  where 
  the 
  16 
  muscular 
  trapezia 
  are 
  separated 
  

   from 
  one 
  another 
  by 
  very 
  narrow 
  gaps, 
  if 
  at 
  all. 
  But 
  the 
  two 
  ex- 
  

   tremes 
  are 
  not 
  discontinuous, 
  for 
  in 
  specimens 
  from 
  Puget 
  Sound 
  

   and 
  from 
  Sakhalin 
  Island 
  the 
  outer 
  part 
  of 
  the 
  circular 
  musculature 
  

   is 
  broken 
  by 
  16 
  gaps 
  of 
  medium 
  breadth, 
  though 
  the 
  inner 
  part 
  is 
  

   continuous 
  all 
  around 
  its 
  circumference. 
  

  

  CYANEA 
  CAPILLATA, 
  var. 
  CAPILLATA 
  (Linnaeus) 
  Eschscholtz. 
  

  

  Plate 
  4, 
  figs. 
  8, 
  9. 
  

  

  Medusa 
  capillata 
  Linnaeus, 
  1758, 
  vol. 
  1, 
  p. 
  660. 
  

  

  (For 
  synonymy 
  and 
  synopsis 
  of 
  varieties, 
  see 
  Mayer, 
  1910, 
  pp. 
  596, 
  597.) 
  

  

  Dutch 
  Harbor, 
  May 
  26, 
  surface; 
  3 
  medium-sized 
  specimens, 
  75, 
  

   120, 
  170 
  mm. 
  in 
  diameter; 
  7 
  small 
  ones, 
  22-40 
  mm. 
  

   Station 
  5005, 
  surface; 
  1 
  specimen, 
  70 
  mm.; 
  disk 
  only. 
  

   Station 
  5024, 
  surface; 
  1 
  specimen, 
  160 
  mm. 
  

  

  CYANEA 
  CAPILLATA. 
  var. 
  NOZAEn 
  Eishinouye. 
  

  

  Plate 
  4, 
  figs. 
  5-7. 
  

   Cyanea 
  nozakii 
  Kishinouye, 
  1891, 
  p. 
  1, 
  pi. 
  1. 
  

  

  Kobe, 
  Japan, 
  August 
  24, 
  surface; 
  1 
  specimen 
  of 
  about 
  150 
  mm.; 
  

   in 
  excellent 
  condition. 
  

  

  This 
  specimen 
  is 
  particularly 
  interesting, 
  as 
  showing 
  how 
  much 
  

   nozakii 
  differs 
  from 
  cajnllata 
  in 
  its 
  extreme 
  type. 
  As 
  pointed 
  out 
  

   above, 
  the 
  characters 
  of 
  importance 
  in 
  this 
  respect 
  are 
  the 
  form 
  of 
  the 
  

   marginal 
  lappets, 
  the 
  structure 
  of 
  the 
  musculature 
  and 
  the 
  color. 
  

   The 
  interrhopalar 
  notches 
  are 
  not 
  so 
  deep 
  as 
  the 
  rhopalar, 
  and 
  the 
  

   margin 
  follows 
  an 
  uninterrupted 
  curve, 
  between 
  the 
  two, 
  so 
  that 
  

   there 
  are 
  no 
  distinct 
  rhopalar 
  lappets. 
  

  

  The 
  subumbrella 
  musculature 
  consists 
  of 
  series 
  of 
  radial 
  and 
  cir- 
  

   cular 
  bands 
  (pi. 
  4, 
  fig. 
  5), 
  the 
  latter 
  broken 
  into 
  16 
  groups 
  separated 
  

   by 
  broad, 
  rounded 
  gelatinous 
  ridges, 
  the 
  interrhopalar 
  groups 
  being 
  

   about 
  twice 
  as 
  long 
  as 
  the 
  rhopalar. 
  And 
  they 
  differ 
  from 
  those 
  of 
  

   capillata 
  not 
  only 
  in 
  this 
  respect 
  but 
  also 
  in 
  the 
  fact 
  that 
  the 
  indi- 
  

   vidual 
  muscle 
  bands 
  are 
  fewer 
  in 
  number 
  (only 
  9-10 
  in 
  each 
  group 
  

   instead 
  of 
  15-20), 
  and 
  much 
  stouter. 
  

  

  The 
  rhopalia, 
  likewise, 
  separate 
  nozakii 
  (pi. 
  4, 
  fig. 
  6) 
  from 
  cajnUata 
  

   (pi. 
  4, 
  fig, 
  9), 
  for 
  in 
  the 
  former 
  they 
  lack 
  the 
  rounded 
  prominences 
  

   on 
  the 
  subumbral 
  side 
  near 
  the 
  base, 
  which 
  are 
  prominent 
  features 
  

   in 
  the 
  latter. 
  

  

  The 
  specimen 
  is 
  colorless. 
  

  

  