﻿jbt.25 
  GENERA 
  SIPHOGENERINA 
  AND 
  PAVONINA 
  CUSHMAN 
  23 
  

  

  EXPLANATION 
  OF 
  PLATES 
  

  

  Plate 
  1 
  

  

  Figs. 
  1, 
  2. 
  Siphogenerina 
  raphanus. 
  Original 
  figures. 
  X30. 
  Specimens 
  from 
  

   "East 
  Indian 
  Seas." 
  

   3, 
  4. 
  Siphogenerina 
  raphanus. 
  X40. 
  Specimens 
  from 
  the 
  North 
  Pacific. 
  

   Figure 
  3, 
  megalospheric; 
  figure 
  4a 
  microspheric; 
  46, 
  end 
  view. 
  

  

  5. 
  Siphogenerina 
  raphanus, 
  var. 
  tropica. 
  X66. 
  Microspheric 
  specimen. 
  

  

  6. 
  Siphogenerina 
  raphanus, 
  var. 
  transversus. 
  X35. 
  

  

  7-9. 
  Siphogenerina 
  branneri. 
  (After 
  Bagg.) 
  X23. 
  From 
  the 
  Miocene- 
  

   Monterey 
  shale 
  of 
  California. 
  Figure 
  7, 
  microspheric 
  form, 
  type 
  

   specimen; 
  figures 
  8, 
  9, 
  megalospheric 
  forms. 
  Figure 
  8, 
  Sagrina 
  

   californiensis; 
  figure 
  9, 
  Sagrina 
  elongata. 
  

  

  10a, 
  b. 
  Siphogenerina 
  striatula. 
  X75. 
  a, 
  front 
  view; 
  b, 
  apertural 
  view. 
  

   From 
  the 
  North 
  Pacific. 
  

  

  11, 
  12. 
  Siphogenerina 
  irregularis. 
  X75. 
  Figure 
  11a, 
  front 
  view; 
  b, 
  aper- 
  

   tural 
  view; 
  figure 
  12, 
  median 
  section 
  of 
  last 
  two 
  chambers. 
  From 
  

   off 
  the 
  Hawaiian 
  Islands. 
  

  

  13. 
  Siphogenerina 
  lamellata. 
  X60. 
  Miocene, 
  one 
  mile 
  south 
  of 
  Red 
  

   Bay, 
  Florida. 
  

  

  14. 
  Siphogenerina 
  spinosa. 
  (After 
  Bagg.) 
  X40. 
  From 
  the 
  Miocene, 
  

  

  Jones 
  Wharf, 
  Maryland. 
  

  

  Plate 
  2 
  

  

  Figs. 
  1, 
  2. 
  Siphogenerina 
  raphanus. 
  X65. 
  Figure 
  1, 
  microspheric; 
  figure 
  2, 
  

   megalospheric. 
  Specimens 
  from 
  Samoa. 
  

  

  3. 
  Siphogenerina 
  raphanus. 
  X50. 
  Megalospheric 
  specimen 
  from 
  Tor- 
  

  

  tugas 
  region, 
  Gulf 
  of 
  Mexico. 
  

  

  4. 
  Siphogenerina 
  columellaris. 
  X65. 
  Specimen 
  from 
  the 
  Philippines. 
  

  

  5. 
  Siphogenerina 
  striata, 
  var. 
  curta. 
  X65. 
  Specimen 
  from 
  the 
  

  

  Philippines. 
  

  

  6. 
  Siphogenerina 
  bifrons, 
  var. 
  striatula. 
  X65. 
  Specimen 
  from 
  the 
  

  

  Philippines. 
  

   7,^8. 
  Siphogenerina 
  virgula. 
  X65. 
  Specimens 
  from 
  Samoa. 
  

  

  9. 
  Siphogenerina 
  dimorpha, 
  var. 
  pacifica. 
  X65. 
  Specimen 
  from 
  the 
  

   Philippines. 
  

  

  10. 
  Siphogenerina 
  raphanus. 
  X75. 
  Later 
  chambers 
  by 
  transmitted 
  

  

  light, 
  showing 
  central 
  tubes. 
  

  

  11. 
  Siphogenerina 
  columellaris. 
  X65. 
  Microspheric 
  specimen 
  from 
  

  

  Samoa. 
  

  

  Plate 
  3 
  

  

  Figs. 
  1,[2. 
  Siphogenerina 
  columellaris. 
  X 
  100. 
  Sections. 
  (After 
  Silvestri.) 
  

   Figure 
  1, 
  megalospheric; 
  figure 
  2, 
  microspheric 
  form. 
  

   3. 
  Siphogenerina 
  columellaris. 
  X75. 
  Specimen 
  by 
  transmitted 
  light. 
  

   4a, 
  b. 
  Siphogenerina 
  columellaris. 
  X75. 
  a, 
  front 
  view; 
  b, 
  apertural 
  view 
  

   Specimens 
  from 
  the 
  North 
  Pacific. 
  

   5. 
  Siphogenerina 
  dimorpha. 
  X30. 
  Figure 
  of 
  type 
  specimen. 
  (After 
  

   Parker 
  and 
  Jones.) 
  From 
  the 
  Abrohlos 
  Bank, 
  Atlantic. 
  

   6a, 
  b. 
  Siphogenerina 
  dimorpha, 
  var. 
  pacifica. 
  X65. 
  a, 
  front 
  view; 
  b, 
  aper- 
  

   tural 
  view. 
  Specimen 
  from 
  the 
  North 
  Pacific. 
  

   7,[8. 
  Siphogenerina 
  bifrons. 
  X70. 
  Figure 
  7, 
  megalospheric, 
  figure 
  8a, 
  

   microspheric 
  form, 
  figure 
  86, 
  apertural 
  view. 
  Specimens 
  from 
  

   off 
  Japan. 
  

   9. 
  Siphogenerina 
  bifrons. 
  X65. 
  Specimen 
  from 
  the 
  Philippines. 
  

   10a, 
  b. 
  Siphogenerina 
  bifrons, 
  var. 
  sydneyensis. 
  (After 
  Goddard 
  and 
  Jen- 
  

   sen.) 
  a. 
  X90; 
  b, 
  showing 
  pores 
  and 
  structure 
  of 
  wall. 
  

  

  