﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  8IPH0N0PH0RAE—BI0EL0W. 
  97 
  

  

  Phacellophora 
  cavitschatica 
  Hertwig, 
  1878, 
  p. 
  113, 
  114, 
  pi. 
  9, 
  fig. 
  15; 
  pi. 
  10, 
  fig. 
  

  

  16 
  (not 
  Brandt, 
  1835). 
  

   Phacellophora 
  sicula 
  Haeckel, 
  1880, 
  p. 
  551.— 
  Mayee, 
  1910, 
  p. 
  613, 
  fig. 
  392.— 
  

   RrsHiNOUYE, 
  1910, 
  p. 
  21, 
  fig. 
  2. 
  

  

  Station 
  4779, 
  54-0 
  fathoms, 
  Bering 
  Sea; 
  1 
  specimen 
  95 
  mm, 
  in 
  

   diameter. 
  

  

  Agattu 
  Island, 
  surface; 
  1 
  specimen, 
  170 
  mm. 
  in 
  diameter. 
  ' 
  

  

  Also 
  3604, 
  Bering 
  Sea, 
  August, 
  1895; 
  fragments. 
  

  

  The 
  smaller 
  specimen 
  is 
  in 
  fair, 
  the 
  larger 
  one 
  in 
  perfect 
  condition. 
  

  

  The 
  smaller 
  specimen 
  agrees 
  so 
  well 
  with 
  Mayer's 
  figure 
  of 
  a 
  Med- 
  

   iterranean 
  example 
  that 
  the 
  latter 
  might 
  almost 
  have 
  been 
  taken 
  

   from 
  it; 
  the 
  larger 
  differs 
  only 
  in 
  having 
  more 
  canals 
  and 
  tentacles 
  

   and 
  more 
  complex 
  mouth 
  parts. 
  As 
  in 
  Mayer's 
  figure, 
  each 
  rhopa- 
  

   lium 
  is 
  flanked 
  on 
  either 
  side 
  by 
  a 
  rounded 
  lappet, 
  separated 
  from 
  the 
  

   tentacular 
  (velar) 
  lappet, 
  which 
  is 
  likewise 
  rounded, 
  or 
  slightly 
  wavy, 
  

   by 
  a 
  shallow 
  notch 
  (pi. 
  4, 
  fig. 
  10), 
  and 
  practically 
  the 
  same 
  condition 
  

   is 
  figured 
  by 
  Kishinouye 
  (1910) 
  and 
  by 
  Browne 
  (1908), 
  except 
  that 
  

   according 
  to 
  the 
  former 
  the 
  rhopalar 
  lappets 
  are 
  rather 
  more 
  pointed, 
  

   while 
  the 
  latter 
  represents 
  the 
  lappets 
  as 
  proportionately 
  longer 
  and 
  

   narrow^er. 
  

  

  Two 
  antimeres 
  are 
  irregular 
  in 
  having 
  the 
  rhopalar 
  lappets 
  un- 
  

   usually 
  large, 
  and 
  the 
  tentacular 
  lappet 
  entirely 
  suppressed. 
  

  

  Canal 
  system. 
  — 
  In 
  the 
  large 
  specimen 
  91 
  canals 
  leave 
  the 
  stomach, 
  

   but 
  by 
  the 
  branching 
  of 
  the 
  rhopalar 
  canals 
  there 
  are 
  about 
  140 
  at 
  

   the 
  margin. 
  In 
  the 
  smaller 
  specimen 
  there 
  are 
  70 
  at 
  the 
  stomach, 
  

   149 
  at 
  the 
  margin; 
  that 
  is, 
  there 
  is 
  individual 
  variation, 
  apart 
  from 
  

   size. 
  In 
  Mayer's 
  Mediterranean 
  specimen 
  there 
  were 
  64 
  canals 
  at 
  the 
  

   stomach, 
  and 
  his 
  figure 
  shows 
  about 
  110 
  at 
  the 
  margin; 
  in 
  Browne's 
  

   South 
  Atlantic 
  specimen 
  there 
  were 
  42 
  at 
  the 
  stomach. 
  The 
  number 
  

   of 
  blind 
  canals 
  extending 
  into 
  each 
  of 
  the 
  tentacular 
  lobes 
  varies 
  from 
  

   2 
  large 
  and 
  4 
  very 
  minute 
  in 
  an 
  antimere 
  in 
  which 
  the 
  place 
  of 
  the 
  

   tentacular 
  lappet 
  is 
  usurped 
  by 
  the 
  rhopalia 
  of 
  lappets 
  on 
  either 
  

   hand, 
  to 
  10 
  or 
  11, 
  the 
  5 
  or 
  6 
  in 
  the 
  middle 
  being 
  much 
  the 
  largest 
  and 
  

   obviously 
  the 
  oldest, 
  those 
  at 
  either 
  end 
  very 
  small 
  indeed. 
  

  

  In 
  the 
  small 
  specimen 
  there 
  are 
  usually 
  5 
  or 
  6 
  canals 
  to 
  the 
  lobe. 
  

   Kishinouye 
  (1910) 
  shows 
  10, 
  Browne 
  (1908) 
  8, 
  Mayer 
  5 
  to 
  8 
  for 
  his 
  

   Mediterranean, 
  but 
  only 
  2 
  to 
  5 
  for 
  his 
  Eastport 
  specimen. 
  

  

  Mouth 
  'parts. 
  — 
  Each 
  of 
  the 
  four 
  mouth 
  arms 
  is 
  about 
  100 
  mm. 
  

   long, 
  of 
  the 
  same 
  general 
  type 
  as 
  in 
  Cyanea, 
  though 
  not 
  so 
  large; 
  i. 
  e., 
  

   practically 
  the 
  condition 
  figured 
  by 
  Mayer 
  for 
  sicula. 
  In 
  the 
  smaller 
  

   specimen 
  the 
  marginal 
  folds 
  of 
  the 
  mouth 
  arms 
  are 
  largely 
  torn 
  away, 
  

   leaving 
  the 
  stiff 
  aboral 
  axes, 
  which 
  in 
  this 
  mutilated 
  state 
  suggest 
  the 
  

   mouth 
  arms 
  of 
  Aurelia, 
  and 
  in 
  Mayer's 
  figure 
  of 
  his 
  Eastport 
  speci- 
  

   men 
  they 
  seem 
  to 
  be 
  in 
  the 
  same 
  condition. 
  

  

  The 
  rhopalia 
  (pi. 
  5, 
  fig. 
  5) 
  have 
  no 
  oceUi 
  and 
  agree 
  very 
  weU 
  with 
  

   Hertwig's 
  figure. 
  According 
  to 
  Mayer 
  (1910, 
  p. 
  614) 
  there 
  is 
  ''no 
  

  

  69077 
  "-Proc.N.M. 
  vol.44— 
  13 
  7 
  

  

  