﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  SIPHONOPHORAE—BIGELOW. 
  103 
  

  

  of 
  the 
  Aleutians, 
  and 
  the 
  Sea 
  of 
  Okhotsk 
  alone, 
  that 
  is, 
  Meator 
  

   rubatra 
  and 
  Calycopsis 
  nematopJiora, 
  both 
  described 
  here 
  for 
  the 
  first 
  

   time. 
  And 
  though 
  the 
  second 
  may 
  fairly 
  be 
  assumed 
  to 
  be 
  restricted 
  

   to 
  the 
  Berii:^ 
  Sea 
  region, 
  because 
  it 
  is 
  a 
  surface 
  species 
  and 
  has 
  not 
  

   been 
  taken 
  elsewhere 
  although 
  the 
  genus 
  to 
  which 
  it 
  belongs 
  is 
  

   widely 
  distributed, 
  the 
  first 
  is 
  certainly 
  a 
  member 
  of 
  the 
  mesoplankton, 
  

   for 
  which 
  reason 
  it 
  is 
  unsafe 
  to 
  assume 
  that 
  it 
  will 
  not 
  prove 
  to 
  be 
  

   much 
  more 
  widely 
  distributed 
  than 
  now 
  appears, 
  when 
  the 
  bathy- 
  

   metric 
  province 
  to 
  which 
  it 
  belongs 
  is 
  better 
  known. 
  "The 
  same 
  is 
  

   true 
  of 
  Pandea 
  rubra, 
  recorded 
  from 
  Bering 
  Sea 
  and 
  from 
  off 
  the 
  

   coast 
  of 
  British 
  Columbia, 
  and 
  it 
  is 
  questionable 
  whether 
  the 
  single 
  

   Scyphomedusae 
  peculiar 
  to 
  the 
  Bering 
  Sea 
  region, 
  Haliclystus 
  stejnegeri 
  

   Kishinouye, 
  is 
  really 
  separable 
  from 
  H. 
  auricula. 
  

  

  The 
  remaining 
  species 
  are 
  easily 
  classified 
  as 
  to 
  their 
  relationships, 
  

   systematic 
  and 
  geographic. 
  In 
  the 
  first 
  place, 
  there 
  are 
  four 
  "inter- 
  

   mediate" 
  cosmopolitan 
  species, 
  belonging 
  that 
  is, 
  to 
  the 
  mesoplank- 
  

   ton, 
  Halicreas 
  papillosum, 
  Aeginura 
  grimaldii, 
  PeriphyUa 
  hyacintJiina, 
  

   Atolla 
  wyvillei, 
  and 
  one 
  cosmopolitan 
  surface 
  form, 
  Aurelia 
  aurita, 
  

   while 
  two 
  others, 
  Solmissus 
  incisa 
  and 
  Aegina 
  rosea, 
  if 
  not 
  cosmo- 
  

   politan, 
  are 
  at 
  least 
  widely 
  distributed 
  both 
  in 
  the 
  Atlantic 
  and 
  in 
  

   the 
  Indo-Pacific. 
  Then 
  one, 
  BougainviUea 
  hougainviUei, 
  is 
  probably 
  

   identical 
  with 
  the 
  other 
  member 
  of 
  the 
  same 
  genus 
  mentioned 
  in 
  the 
  

   list, 
  B. 
  superciliaris. 
  Sarsia 
  princeps, 
  S. 
  eximia, 
  Hyhocodon 
  prolifer, 
  

   BougainviUea 
  superciliaris, 
  Rathkea 
  hlumenhacJiii, 
  Catablema 
  vesicaria, 
  

   Tiaropsis 
  diademata, 
  Eutonina 
  indicans, 
  StauropJiora 
  mertensii, 
  

   PtycTiogena 
  lactea, 
  Aglaniha 
  digitale, 
  PantacJiogon 
  JiaecTceli, 
  Botrynema 
  

   eUinorae, 
  Aeginopsis 
  laurentii, 
  Haliclystus, 
  and 
  Cyanea 
  capillata 
  var. 
  

   capiUata, 
  are 
  characteristic 
  members 
  of 
  the 
  medusa 
  fauna 
  of 
  the 
  

   boreal 
  Atlantic, 
  or 
  of 
  the 
  Arctic 
  Ocean; 
  Aurelia 
  limhata 
  probably 
  

   occurs 
  in 
  Greenland 
  waters 
  (Vanhoffen, 
  1902a) 
  and 
  Sarsia 
  japoTi- 
  

   ica 
  may 
  be 
  identical 
  with 
  an 
  Arctic 
  species, 
  S. 
  Jiammea, 
  while 
  Cata- 
  

   Uerna 
  multicirrata 
  is 
  a 
  member 
  of 
  a 
  genus 
  which, 
  as 
  here 
  defined, 
  is 
  

   known 
  only 
  from 
  the 
  boreal 
  Atlantic 
  and 
  from 
  the 
  Arctic 
  Ocean. 
  

   Six 
  species, 
  on 
  the 
  other 
  hand, 
  clearly 
  have 
  an 
  Indo-Pacific 
  origin. 
  

   These 
  are 
  Heterotiara 
  anonyma, 
  which 
  is 
  widely 
  distributed 
  in 
  the 
  

   intermediate 
  depths 
  of 
  the 
  Indo-Pacific, 
  but 
  is 
  not 
  know^n 
  from 
  the 
  

   Atlantic; 
  Prohoscydactyla 
  Jlavicirrata, 
  a 
  Pacific 
  species 
  which 
  finds 
  

   its 
  closest 
  ally 
  in 
  the 
  only 
  other 
  member 
  of 
  the 
  genus, 
  ornata,^ 
  one 
  or 
  

   other 
  variety 
  of 
  which 
  is 
  recorded 
  from 
  various 
  locaHties 
  in 
  the 
  

   tropical 
  Atlantic 
  and 
  the 
  Pacific 
  and 
  Indian 
  Oceans; 
  Gonionemus 
  

   vertens 
  var. 
  depressum, 
  which 
  is 
  represented 
  in 
  the 
  north 
  Atlantic 
  

   by 
  a 
  close 
  ally; 
  and 
  CTirysaora 
  lielvola, 
  which 
  is 
  so 
  far 
  known 
  only 
  

   from 
  the 
  two 
  sides 
  of 
  the 
  northwestern 
  Pacific, 
  though 
  it 
  is 
  certainly 
  

  

  1 
  1 
  have 
  recently 
  examined 
  two 
  excellent 
  specimens 
  o( 
  flavicirrata 
  from 
  Puget 
  Sound, 
  finding 
  that 
  the 
  

   mode 
  of 
  branching 
  of 
  the 
  canal 
  agrees 
  very 
  well 
  with 
  Brandt's 
  (1838) 
  figure; 
  this 
  separates 
  them, 
  as 
  I 
  sup- 
  

   posed 
  (19096), 
  from 
  ornata. 
  

  

  