﻿NO. 
  1946. 
  PACIFIC 
  MEDUSAE 
  AND 
  8IPH0N0PH0RAE—BIGEL0W. 
  Ill 
  

  

  vesicaria, 
  which 
  appear 
  only 
  in 
  winter 
  south 
  of 
  Cape 
  Cod; 
  and 
  in 
  

   Japan 
  the 
  Tsugaru 
  Strait 
  marks 
  a 
  similar 
  division. 
  But 
  both 
  in 
  the 
  

   Atlantic 
  and 
  in 
  the 
  Pacific 
  there 
  are 
  records 
  of 
  the 
  occurrence 
  of 
  trop- 
  

   ical 
  coelenterates 
  from 
  far 
  north 
  of 
  their 
  usual 
  range, 
  such 
  as 
  Physalia 
  

   in 
  the 
  Bay 
  of 
  Fundy, 
  Pelagia 
  in 
  Bering 
  Sea. 
  

  

  In 
  the 
  cold 
  season 
  the 
  process 
  of 
  dispersal 
  is 
  reversed, 
  the 
  warm- 
  

   water 
  species 
  receding, 
  the 
  cold-water 
  ones 
  advancing 
  toward 
  the 
  

   south. 
  We 
  do 
  not 
  know 
  just 
  how 
  far 
  southward 
  boreal 
  medusae 
  

   extend 
  along 
  the 
  coasts 
  of 
  the 
  United 
  States 
  in 
  winter, 
  but 
  several 
  

   appear 
  regularly 
  at 
  that 
  season 
  at 
  Woods 
  Hole 
  and 
  in 
  Narragansett 
  

   Bay, 
  and 
  I 
  have 
  myself 
  seen 
  the 
  waters 
  of 
  Pamlico 
  Sound 
  (only 
  a 
  few 
  

   miles 
  north 
  of 
  Cape 
  Hatteras) 
  crowded 
  with 
  the 
  dark 
  red 
  northern 
  

   Cyanea, 
  in 
  January, 
  after 
  prolonged 
  northeast 
  storms. 
  In 
  Japan, 
  as 
  

   pointed 
  out 
  above, 
  boreal 
  species 
  appear 
  in 
  Sagami 
  Bay 
  during 
  the 
  

   cold 
  season, 
  and 
  it 
  is 
  probable 
  that 
  they 
  advance 
  even 
  farther 
  

   southward. 
  

  

  BIBLIOGRAPHY. 
  

  

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  Agassiz, 
  a. 
  North 
  American 
  Acalephae. 
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  Mus. 
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  Zool., 
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  Coll., 
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  14+334, 
  360 
  figs. 
  

   1883. 
  . 
  Exploration 
  of 
  the 
  surface 
  fauna 
  of 
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  Gulf 
  stream. 
  The 
  Por- 
  

  

  pitidae 
  and 
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  Mem. 
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  Comp. 
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  Harvard 
  Coll., 
  vol. 
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  pp. 
  16, 
  12 
  pis. 
  

   1899. 
  and 
  Mayer, 
  A. 
  G. 
  Acalephs 
  from 
  the 
  Fiji 
  Islands. 
  Bull. 
  Mus. 
  

  

  Comp. 
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  157-189, 
  17 
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   1902. 
  . 
  Reports 
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  to 
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  Pacific, 
  1899-1900. 
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  Coll., 
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  149-176, 
  14 
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   1849. 
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  of 
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  America. 
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  Boston, 
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  8+372+(12), 
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   1859. 
  Allman, 
  G. 
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  Notes 
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  23 
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   1878. 
  — 
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  during 
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  1908, 
  with 
  description 
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  a 
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  (Bythotiaridae). 
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  1 
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   1911a. 
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  1900. 
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