﻿638 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  tol. 
  44. 
  

  

  fine 
  sand 
  grains 
  with 
  a 
  grayish-brown 
  cement; 
  aperture 
  narrow 
  and 
  

   elongate 
  in 
  adult 
  chambers, 
  but 
  rounded 
  in 
  the 
  early 
  ones, 
  near 
  the 
  

   middle 
  of 
  the 
  terminal 
  face 
  of 
  the 
  last 
  formed 
  chamber, 
  but 
  removed 
  

   from 
  the 
  border 
  of 
  the 
  preceding 
  chamber; 
  color 
  light 
  brown. 
  

  

  Diameter 
  about 
  1 
  mm. 
  or 
  over. 
  

  

  Type-specimen. 
  — 
  Cat. 
  No. 
  8513, 
  U.S.N.M., 
  from 
  Albatross 
  station 
  

   D5613, 
  north 
  of 
  Celebes, 
  752 
  fathoms. 
  

  

  Usually 
  in 
  the 
  specimens 
  broken 
  back 
  there 
  are 
  four 
  chambers, 
  

   sometimes 
  five. 
  The 
  increase 
  in 
  size 
  is 
  very 
  rapid, 
  after 
  the 
  second 
  

   chamber. 
  In 
  adult 
  specimens 
  the 
  last 
  formed 
  chamber 
  is 
  nearly 
  

   spherical 
  but 
  the 
  preceding 
  chamber 
  appears 
  as 
  a 
  slight 
  protuberance, 
  

   often 
  causing 
  an 
  ovate 
  shape. 
  The 
  species 
  was 
  found 
  m 
  considerable 
  

   numbers 
  at 
  this 
  and 
  other 
  stations. 
  

  

  EXPLANATION 
  OF 
  PLATES. 
  

  

  Plate 
  78. 
  

  

  Fig. 
  1. 
  Textularia 
  vertehralis. 
  X25. 
  a, 
  front 
  view; 
  b, 
  aperttiral 
  view. 
  

  

  2. 
  Gaudryinarobusta. 
  Xl8. 
  o, 
  view 
  from 
  angle; 
  6, 
  apertural 
  view; 
  c, 
  view 
  from 
  

   flattened 
  side. 
  

  

  Plate 
  79. 
  

  

  Fig. 
  1. 
  Ammochilostoma 
  rotundata. 
  X33. 
  a, 
  apertural 
  view; 
  6, 
  front 
  view. 
  

  

  2. 
  Textularia 
  immensa. 
  XIO. 
  a, 
  apertural 
  view, 
  showing 
  the 
  several 
  apertural 
  

  

  openings; 
  b, 
  front 
  view. 
  

  

  3. 
  ClavuUna 
  rotundata. 
  X25. 
  a, 
  apertural 
  view; 
  b, 
  front 
  view. 
  

  

  4. 
  Thurammina 
  papyracea. 
  X25. 
  

  

  5. 
  Textularia 
  excavata. 
  X20. 
  a, 
  apertural 
  view; 
  6, 
  front 
  view. 
  

  

  6. 
  Reophax 
  agqlutinatus. 
  XlO. 
  a, 
  apertural 
  view; 
  6, 
  front 
  view. 
  

  

  Plate 
  80. 
  

  

  Fig. 
  1. 
  Virgulina 
  cornuta. 
  X50. 
  a, 
  front 
  view; 
  b, 
  rear 
  view; 
  f, 
  apertural 
  view; 
  d, 
  

   side 
  view. 
  

  

  2. 
  Bolivina 
  sculpturata. 
  X40. 
  a, 
  apertural 
  view; 
  6, 
  front 
  view. 
  

  

  3. 
  Gaudryina 
  attenuata. 
  X25. 
  a, 
  front 
  view; 
  b, 
  apertural 
  view; 
  c, 
  apertural 
  

  

  view 
  of 
  an 
  earlier 
  portion 
  of 
  the 
  uniserial 
  stage 
  with 
  the 
  aperture 
  asym- 
  

   metrical; 
  d, 
  apertural 
  view 
  of 
  the 
  biserial 
  stage. 
  

  

  4. 
  ClavuUna 
  primxva. 
  X25. 
  Young 
  specimen 
  showing 
  biserial 
  stage 
  with 
  the 
  

  

  aperture 
  at 
  the 
  inner 
  margin 
  of 
  the 
  chamber, 
  but 
  tubular. 
  

  

  5. 
  ClavuUna 
  primxva. 
  X25. 
  a, 
  apertural 
  view; 
  6, 
  front 
  view. 
  

  

  6. 
  Textularia 
  semialata. 
  X50. 
  a, 
  apertural 
  view; 
  b, 
  front 
  view. 
  Microspheric 
  

  

  specimen 
  . 
  

  

  7. 
  Textularia 
  semialata. 
  X50. 
  Megalospheric 
  specimen. 
  

  

  