﻿238 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  VOL. 
  98 
  

  

  species 
  known 
  from 
  both 
  the 
  Japanese 
  and 
  California 
  coasts, 
  A771- 
  

   mothella 
  hi-unguiculata^ 
  is 
  also 
  known 
  from 
  Naples, 
  Hawaii, 
  and 
  West- 
  

   ern 
  Australia, 
  and 
  it 
  appears 
  to 
  be 
  that 
  rara 
  avis 
  among 
  the 
  F'ycnogon- 
  

   ida, 
  a 
  cosmopolitan 
  littoral 
  species. 
  This 
  species 
  is 
  obviously 
  a 
  

   warm- 
  water 
  form, 
  for 
  on 
  the 
  California 
  coast 
  it 
  does 
  not 
  occur 
  north 
  

   of 
  Point 
  Concepcion, 
  and 
  in 
  Japan 
  it 
  has 
  not 
  been 
  recorded 
  north 
  of 
  

   latitude 
  35°. 
  Still 
  another 
  species, 
  Achelia 
  echinata^ 
  may 
  be 
  cosmo- 
  

   politan, 
  but 
  it 
  will 
  be 
  necessary 
  to 
  examine 
  comparative 
  material 
  

   from 
  the 
  various 
  parts 
  of 
  the 
  w^orld 
  in 
  which 
  forms 
  ascribed 
  to 
  this 
  

   species 
  have 
  been 
  identified 
  before 
  it 
  is 
  possible 
  to 
  confirm 
  this 
  dis- 
  

   tribution. 
  Achelia 
  echinata, 
  or 
  its 
  varieties, 
  has 
  been 
  identified 
  from 
  

   China 
  (Kiaochow), 
  Japan, 
  Alaska, 
  San 
  Francisco 
  Bay, 
  Europe 
  (Nor- 
  

   way, 
  France, 
  England, 
  and 
  Italy) 
  and 
  some 
  authors 
  have 
  suggested 
  

   that 
  the 
  New 
  England 
  Achelia 
  spinosa 
  is 
  also 
  synonymous 
  with 
  this 
  

   species. 
  As 
  a 
  rule, 
  however, 
  species 
  common 
  to 
  both 
  sides 
  of 
  the 
  Pa- 
  

   cific 
  are 
  cold-water 
  forms, 
  which 
  are 
  apparently 
  dispersed 
  from 
  the 
  

   north 
  (fig. 
  18). 
  

  

  Figure 
  18. 
  — 
  Distribution 
  of 
  various 
  species 
  of 
  pycnogonids 
  in 
  the 
  Nortfi 
  Pacific 
  (compiled 
  

  

  from 
  various 
  sources). 
  

  

  Evidently 
  the 
  Kuroshio 
  has 
  less 
  effect 
  on 
  the 
  distribution 
  of 
  these 
  

   animals 
  than 
  the 
  Gulf 
  Stream 
  has 
  in 
  the 
  North 
  Atlantic, 
  and 
  several 
  

  

  