﻿art. 
  25 
  GENERA 
  SIPHOGENERINA 
  AND 
  PAVON1NA 
  CUSHMAN 
  13 
  

  

  SIPHOGENERINA 
  DIMORPHA 
  (Parker 
  and 
  Jones) 
  

  

  Plate 
  3, 
  fig. 
  5 
  

  

  Uvigerina 
  (Sagrina) 
  dimorpha 
  Parker 
  and 
  Jones, 
  Philos. 
  Trans., 
  vol. 
  55, 
  

   1865, 
  p. 
  420, 
  pi. 
  18, 
  fig. 
  18. 
  

  

  Sagrina 
  dimorpha 
  H. 
  B. 
  Brady, 
  Journ. 
  Roy. 
  Micr. 
  Soc, 
  1887, 
  p. 
  915. 
  — 
  H. 
  B. 
  

   Brady, 
  Parker 
  and 
  Jones, 
  Trans. 
  Zool. 
  Soc. 
  London, 
  vol. 
  12, 
  1888, 
  p. 
  

   225, 
  pi. 
  45, 
  fig. 
  6.— 
  Goes, 
  Kongl. 
  Svensk. 
  Vet. 
  Akad. 
  Handl., 
  vol. 
  25, 
  

   No. 
  9, 
  1894, 
  p. 
  52, 
  pi. 
  9, 
  figs. 
  510, 
  511.— 
  Kiaer, 
  Rep't. 
  Norwegian 
  Fish, 
  

   and 
  Mar. 
  Invest., 
  vol. 
  1, 
  No. 
  7, 
  1900, 
  p. 
  37. 
  — 
  Heron-Allen 
  and 
  Ear- 
  

   land, 
  Trans. 
  Linn. 
  Soc. 
  London, 
  ser. 
  2, 
  vol. 
  2, 
  1916, 
  p. 
  266. 
  

  

  Siphogenerina 
  dimorpha 
  Cushman, 
  Bull. 
  104, 
  U. 
  S. 
  Nat. 
  Mus., 
  pt. 
  4, 
  1923, 
  

   p. 
  175, 
  pi. 
  42, 
  figs. 
  16-18. 
  

  

  Description.— 
  Test 
  somewhat 
  compressed, 
  very 
  slightly 
  tapering, 
  

   the 
  greatest 
  width 
  usually 
  near 
  the 
  apertural 
  end; 
  chambers 
  com- 
  

   paratively 
  few, 
  rather 
  broader 
  than 
  high, 
  slightly 
  inflated; 
  sutures 
  

   distinct, 
  the 
  basal 
  portion 
  in 
  the 
  last-formed 
  chambers 
  sometimes 
  

   slightly 
  excavated 
  tending 
  to 
  bridge 
  the 
  sutures 
  between 
  the 
  excava- 
  

   tions 
  at 
  regular 
  intervals; 
  wall 
  with 
  a 
  coarsely 
  pitted 
  surface; 
  aperture 
  

   circular, 
  terminal, 
  at 
  the 
  end 
  of 
  a 
  short 
  neck, 
  usually 
  with 
  a 
  distinctly 
  

   phi 
  aline 
  lip. 
  

  

  Length 
  not 
  over 
  0.60 
  mm. 
  

  

  Distribution. 
  — 
  This 
  species 
  should 
  be 
  distinguished 
  from 
  the 
  fol- 
  

   lowing 
  variety. 
  Parker 
  and 
  Jones 
  figured 
  as 
  their 
  type 
  a 
  specimen 
  

   from 
  the 
  Abrohlos 
  Bank 
  off 
  Brazil. 
  It 
  must, 
  therefore, 
  be 
  taken 
  as 
  

   the 
  type, 
  and 
  the 
  Pacific 
  form 
  made 
  a 
  variety. 
  

  

  Atlantic 
  records 
  include 
  the 
  Abrohlos 
  Bank 
  (Parker 
  and 
  Jones: 
  

   H. 
  B. 
  Brady, 
  Parker 
  and 
  Jones) 
  ; 
  Bukken 
  and 
  Oster 
  Fiords, 
  near 
  

   Bergen, 
  Norway 
  (Norman) 
  (Brady) 
  (Goes) 
  (Kiaer); 
  Vest 
  Fiord 
  

   (Kiaer) 
  ; 
  low 
  water, 
  Howport, 
  Girvan, 
  Scotland 
  (Robertson) 
  (Brady) 
  ; 
  

   west 
  of 
  Scotland, 
  rare 
  (Heron-Allen 
  and 
  Earland) 
  ; 
  off 
  Gomera, 
  

   Canaries, 
  and 
  off 
  Culebra 
  Island, 
  West 
  Indies 
  (Brady), 
  and 
  possibly 
  

   in 
  the 
  South 
  Atlantic, 
  off 
  Ascension 
  Island 
  (Brady). 
  

  

  I 
  have 
  had 
  specimens 
  from 
  off 
  the 
  coast 
  of 
  Georgia, 
  between 
  Cuba 
  

   and 
  Yucatan, 
  and 
  from 
  three 
  stations 
  in 
  the 
  Caribbean. 
  

  

  It 
  has, 
  therefore, 
  a 
  rather 
  wide 
  Atlantic 
  distribution. 
  

  

  The 
  Pacific 
  form 
  is 
  the 
  following 
  variety: 
  

  

  SIPHOGENERINA 
  DIMORPHA 
  (Parker 
  and 
  Jones), 
  var. 
  PACIFICA, 
  new 
  variety 
  

  

  Plate 
  2, 
  fig. 
  9; 
  plate 
  3, 
  figs. 
  6a, 
  b 
  

  

  Uvigerina 
  (Sagrina) 
  dimorpha 
  Parker 
  and 
  Jones 
  (part), 
  Philos. 
  Trans., 
  

   vol. 
  155, 
  1865, 
  p. 
  420. 
  

  

  Sagrina 
  dimorpha 
  H. 
  B. 
  Brady 
  (part), 
  Rep. 
  Voy. 
  Challenger, 
  Zoology, 
  vol. 
  

   9, 
  1884, 
  p. 
  582, 
  pi. 
  76, 
  figs. 
  1-3.— 
  Bagg, 
  Bull. 
  34, 
  U. 
  S. 
  Nat. 
  Mus., 
  1908, 
  

   p. 
  152. 
  — 
  Schubert, 
  Abhandl. 
  geol. 
  Reichs., 
  vol. 
  20, 
  pt. 
  4, 
  1911, 
  p. 
  86. 
  — 
  

   Sidebottom, 
  Journ. 
  Roy. 
  Micr. 
  Soc, 
  1918, 
  p. 
  148. 
  — 
  Heron-Allen 
  and 
  

   Earland, 
  British 
  Antarctic 
  "Terra 
  Nova," 
  Exped., 
  Zoology, 
  vol. 
  6, 
  1922, 
  

   p. 
  186. 
  

  

  