﻿244 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  VOL. 
  98 
  

  

  of 
  the 
  ocean, 
  and 
  the 
  work 
  of 
  the 
  Albatross 
  in 
  the 
  North 
  Atlantic 
  

   was 
  carried 
  out 
  over 
  several 
  years. 
  The 
  most 
  nearly 
  comparable 
  

   expedition 
  is 
  that 
  of 
  the 
  Siboga 
  in 
  the 
  East 
  Indies, 
  which 
  occupied 
  

   323 
  stations 
  between 
  March 
  1899 
  and 
  February 
  1900. 
  Thirty-seven 
  

   species, 
  representing 
  17 
  genera, 
  of 
  pycnogonids 
  were 
  collected 
  at 
  40 
  

   of 
  these 
  stations, 
  and 
  the 
  total 
  number 
  of 
  specimens 
  collected 
  was 
  

   slightly 
  more 
  than 
  200. 
  Thus 
  pycnogonids 
  were 
  taken 
  at 
  12.4 
  per- 
  

   cent 
  of 
  the 
  stations 
  occupied, 
  and 
  the 
  average 
  number 
  of 
  species 
  per 
  

   station 
  was 
  slightly 
  less 
  than 
  one. 
  If, 
  however, 
  we 
  discard 
  the 
  phe- 
  

   nomenal 
  haul 
  of 
  80 
  specimens 
  of 
  Rho'pdlorhynchus 
  kr^yeri 
  at 
  sta- 
  

   tion 
  50, 
  the 
  contrast 
  between 
  hauls 
  in 
  the 
  tropics 
  and 
  in 
  colder 
  waters 
  

   becomes 
  more 
  apparent. 
  As 
  can 
  be 
  seen 
  from 
  a 
  comparison 
  of 
  tables 
  

   3 
  and 
  4, 
  there 
  are 
  usually 
  fewer 
  individuals 
  taken 
  in 
  warm 
  water, 
  

   and 
  the 
  hauls 
  usually 
  contain 
  a 
  greater 
  variety 
  of 
  species. 
  Although 
  

   less 
  rich 
  in 
  genera 
  and 
  species, 
  the 
  northern 
  fauna 
  is 
  more 
  abundant 
  

   in 
  individuals, 
  as 
  is 
  true 
  of 
  most 
  elements 
  in 
  the 
  marine 
  fauna. 
  

  

  ' 
  Not 
  in 
  Japanese 
  area. 
  

  

  ' 
  100 
  specimens 
  of 
  Nymphon 
  braschnikowi, 
  

  

  * 
  Nymphon 
  braschnikowi. 
  

  

  