﻿iBT. 
  25 
  GENERA 
  SIPHOGENERINA 
  AND 
  PAVONINA 
  CUSHMAN 
  21 
  

  

  Specimens 
  are 
  recorded 
  from 
  the 
  Miocene 
  (Filter 
  Quarries) 
  of 
  

   Victoria 
  by 
  Heron- 
  Allen 
  and 
  Earland. 
  23 
  I 
  have 
  had 
  specimens 
  from 
  

   the 
  same 
  locality, 
  but 
  none 
  of 
  them 
  show 
  the 
  embracing 
  chambers 
  

   of 
  typical 
  recent 
  specimens, 
  and 
  the 
  surface 
  ornamentation 
  seems 
  

   different. 
  Howchin 
  2i 
  records 
  the 
  species 
  from 
  the 
  Eocene 
  of 
  Muddy 
  

   Creek, 
  Victoria, 
  but 
  does 
  not 
  figure 
  it. 
  

  

  The 
  figures 
  of 
  this 
  species 
  given 
  by 
  Heron-Allen 
  and 
  Earland 
  

   from 
  the 
  Kerimba 
  region 
  show 
  very 
  beautiful 
  tests. 
  The 
  largest 
  of 
  

   their 
  specimens 
  figured 
  is 
  slightly 
  more 
  than 
  a 
  millimeter 
  in 
  diameter. 
  

  

  Pavonina 
  flabelliformis 
  is 
  replaced 
  in 
  the 
  Atlantic 
  by 
  the 
  following 
  

   species 
  : 
  

  

  PAVONINA 
  ATLANTICA 
  Cushman 
  

  

  Plate 
  6, 
  figs. 
  5, 
  6 
  

  

  Pavonina 
  flabelliformis 
  H. 
  B. 
  Brady 
  (in 
  part) 
  (not 
  d'Orbigny), 
  Rep. 
  Voy. 
  

   Challenger, 
  vol. 
  9, 
  1884, 
  p. 
  374, 
  pi. 
  45, 
  fig. 
  18 
  (not 
  17, 
  19-21).— 
  Wood- 
  

   ward, 
  The 
  Observer, 
  vol. 
  4, 
  1893, 
  p. 
  104. 
  

  

  Pavonina 
  atlantica 
  Cushman, 
  Bull. 
  104, 
  U. 
  S. 
  Nat. 
  Mus., 
  pt. 
  3, 
  1922, 
  p. 
  51, 
  

   pi. 
  19, 
  fig. 
  1. 
  

  

  Description. 
  — 
  Test 
  subtriangular, 
  slightly 
  longer 
  than 
  broad, 
  initial 
  

   end 
  with 
  a 
  short 
  spine, 
  very 
  much 
  compressed, 
  the 
  sides 
  carinate; 
  

   chambers 
  comparatively 
  few, 
  the 
  earliest 
  ones 
  alternating, 
  biserial, 
  

   those 
  of 
  the 
  adult 
  uniserial, 
  broad, 
  and 
  low, 
  extending 
  across 
  the 
  

   width 
  of 
  the 
  test, 
  slightly 
  curved 
  backwards 
  at 
  the 
  ends; 
  sutures 
  

   somewhat 
  limbate, 
  wall 
  thin 
  and 
  transluscent, 
  finely 
  perforate; 
  

   apertures 
  numerous 
  on 
  the 
  terminal 
  wall 
  of 
  the 
  last-formed 
  chamber. 
  

  

  Length 
  up 
  to 
  0.5 
  mm. 
  

  

  The 
  type 
  specimen 
  of 
  this 
  species 
  is 
  from 
  off 
  Sand 
  Key, 
  Florida, 
  

   in 
  92 
  fathoms. 
  It 
  was 
  also 
  found 
  at 
  stations 
  off 
  Florida 
  and 
  in 
  the 
  

   Tortugas 
  lagoon. 
  The 
  specimens 
  recorded 
  by 
  Brady 
  as 
  P. 
  flabelli- 
  

   formis 
  from 
  off 
  Culebra 
  Island 
  in 
  390 
  fathoms 
  are 
  this 
  species. 
  

   Plate 
  45, 
  Figure 
  18, 
  of 
  the 
  Challenger 
  Report 
  is 
  from 
  this 
  station. 
  

   Figures 
  19 
  and 
  20 
  are 
  P 
  . 
  flabelliformis 
  from 
  shore 
  sand 
  of 
  Tamatave, 
  

   Madagascar, 
  and 
  Figure 
  21 
  is 
  from 
  off 
  Calpentyn, 
  Ceylon 
  in 
  2 
  

   fathoms. 
  I 
  have 
  no 
  data 
  for 
  Figure 
  17, 
  but 
  it 
  is 
  probably 
  from 
  

   Madagascar. 
  

  

  Brady's 
  figure 
  (pi. 
  45, 
  fig. 
  18), 
  shows 
  the 
  traces 
  of 
  the 
  lateral 
  car- 
  

   inae 
  characteristic 
  of 
  P. 
  atlantica. 
  

  

  Pavonina 
  atlantica 
  in 
  its 
  very 
  triangular 
  form 
  throughout 
  instead 
  

   of 
  the 
  circular 
  form 
  of 
  P. 
  flabelliformis 
  is 
  very 
  distinctive. 
  In 
  this 
  

   character 
  P. 
  atlantica 
  is 
  nearer 
  to 
  the 
  following 
  species 
  : 
  

  

  23 
  Journ. 
  Roy. 
  Micr. 
  Soc, 
  1924, 
  p. 
  141, 
  pi. 
  8, 
  fig. 
  22. 
  

  

  21 
  Trans. 
  Proc. 
  Roy. 
  Soc. 
  So. 
  Australia, 
  vol. 
  12, 
  1889, 
  p. 
  7. 
  

  

  