﻿24 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  Plate 
  4 
  

  

  Figs. 
  1-3. 
  Siphogenerina 
  bifrons, 
  var. 
  striatula. 
  X75. 
  Specimen 
  from 
  the 
  

   Philippines. 
  

   4. 
  Siphogenerina 
  bifrons. 
  X75. 
  Broken, 
  microspheric 
  specimen. 
  From 
  

   off 
  Japan. 
  

   5, 
  6. 
  Siphogenerina 
  columellaris. 
  (After 
  Millett.) 
  X 
  100. 
  Figure 
  5, 
  mi- 
  

   crospheric 
  specimen, 
  showing 
  the 
  internal 
  structure; 
  figure 
  6, 
  megalo- 
  

   spheric 
  form. 
  Specimens 
  from 
  the 
  Malay 
  Archipelago. 
  

   7. 
  Siphogenerina 
  branneri. 
  X75. 
  Specimen 
  from 
  the 
  type 
  locality. 
  

   8, 
  9. 
  Siphogenerina 
  virgula. 
  (After 
  Heron-Allen 
  and 
  Earland.) 
  X 
  100. 
  

   Specimens 
  from 
  the 
  Kerimba 
  Archipelago, 
  Southeast 
  Africa. 
  

  

  Plate 
  5 
  

  

  Figs. 
  1,2. 
  Siphogenerina 
  raphanus. 
  X75. 
  Specimens 
  from 
  Porto 
  Rico. 
  

  

  3a, 
  b. 
  Siphogenerina 
  advena. 
  X75. 
  a, 
  front 
  view; 
  6,apertural 
  view. 
  Speci- 
  

   mens 
  from 
  Tortugas 
  region, 
  Gulf 
  of 
  Mexico. 
  

   4a, 
  b. 
  Siphogenerina 
  mexicana. 
  X75. 
  a, 
  front 
  view; 
  6, 
  side 
  view. 
  Speci- 
  

   mens 
  from 
  the 
  Upper 
  Eocene, 
  Alazan 
  Clay, 
  Mexico. 
  

   5, 
  6. 
  Siphogenerina 
  striata, 
  var. 
  curta. 
  X75. 
  Specimens 
  from 
  the 
  Philip- 
  

   pines. 
  

   7,8. 
  Siphogenerina 
  raphanus, 
  var. 
  tropica. 
  X75. 
  Specimens 
  from 
  the 
  

   Philippines. 
  

   9-11. 
  Siphogenerina 
  columellaris. 
  X75. 
  Figures 
  9, 
  10, 
  megalospheric 
  forms 
  

   from 
  the 
  Philippines; 
  figure 
  11, 
  microspheric 
  form 
  from 
  Samoa. 
  

  

  Plate 
  6 
  

  

  Figs. 
  1-4. 
  Pavonina 
  flabelliformis. 
  (After 
  Heron-Allen 
  and 
  Earland.) 
  

  

  1. 
  Young 
  with 
  the 
  textularian 
  stage 
  just 
  completed. 
  X50. 
  

  

  2. 
  Early 
  stage 
  showing 
  the 
  semicircular 
  chambers 
  already 
  

  

  developed. 
  X50. 
  

  

  3. 
  Adult 
  specimen 
  with 
  the 
  chambers 
  nearly 
  annular. 
  X50. 
  

  

  4. 
  Side 
  view 
  of 
  specimen 
  mounted 
  in 
  balsam, 
  showing 
  the 
  

  

  arrangement 
  of 
  chambers 
  in 
  the 
  development 
  of 
  the 
  test. 
  

   X 
  70. 
  (Specimens 
  from 
  the 
  Kerimba 
  Archipelago.) 
  

   Figs. 
  5, 
  6. 
  Pavonina 
  atlantica. 
  

  

  Young 
  specimens 
  from 
  the 
  coast 
  of 
  Florida, 
  showing 
  the 
  tex- 
  

   tularian 
  young, 
  and 
  the 
  wedge-shaped 
  test 
  instead 
  of 
  the 
  

   broadly 
  curved 
  chambers 
  of 
  the 
  preceding 
  species. 
  The 
  

   ornamentation 
  of 
  the 
  biserial 
  portion 
  is 
  much 
  coarser 
  than 
  

   that 
  of 
  the 
  later 
  uniserial 
  chambers. 
  X 
  100. 
  

   Figs. 
  7-9. 
  Pavonina 
  mexicana, 
  new 
  species. 
  

  

  7. 
  Somewhat 
  broken 
  specimen, 
  showing 
  the 
  trucate 
  initial 
  end, 
  

  

  the 
  proloculum 
  and 
  spiral 
  chambers 
  followed 
  by 
  a 
  number 
  

   of 
  textularian 
  chambers. 
  The 
  uniserial 
  chambers 
  show 
  no 
  

   tendency 
  to 
  become 
  nearly 
  annular. 
  X50. 
  

  

  8. 
  A 
  young 
  specimen, 
  showing 
  the 
  details 
  of 
  the 
  early 
  chambers. 
  

  

  X100. 
  

  

  9. 
  A 
  partially 
  developed 
  specimen. 
  X50. 
  (Specimens 
  from 
  

  

  the 
  Alazan 
  Clays 
  of 
  Mexico.) 
  

  

  o 
  

  

  