﻿22 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  PAVONINA 
  MEXICAN 
  A 
  new 
  species 
  

  

  Plate 
  6, 
  figs. 
  7-9 
  

  

  Description. 
  — 
  Test 
  large, 
  about 
  as 
  long 
  as 
  broad, 
  roughly 
  triangular, 
  

   gradually 
  tapering 
  to 
  the 
  somewhat 
  truncate 
  base, 
  much 
  compressed; 
  

   chambers 
  numerous, 
  the 
  earlier 
  ones 
  biserial, 
  the 
  later 
  ones 
  very 
  

   elongate, 
  uniserial, 
  apertural 
  end 
  rounded, 
  sutures 
  slightly 
  limbate, 
  

   sometimes 
  beaded; 
  wall 
  slightly 
  arenaceous, 
  but 
  smoothly 
  finished; 
  

   apertures 
  about 
  the 
  peripheral 
  face. 
  

  

  Length 
  up 
  to 
  1.25 
  mm. 
  

  

  Type 
  specimens. 
  — 
  (Cat. 
  No. 
  353173 
  U.S.N.M.) 
  from 
  the 
  Tertiary 
  

   of 
  Mexico. 
  This 
  is 
  in 
  the 
  Alazan 
  Clay 
  of 
  Rio 
  Buena 
  Vista, 
  0.5 
  

   kms. 
  25° 
  E. 
  from 
  Tumbadero 
  Hacienda 
  House, 
  state 
  of 
  Vera 
  Cruz, 
  

   T. 
  W. 
  Vaughan, 
  collector. 
  

  

  This 
  is 
  the 
  only 
  known 
  locality 
  for 
  this 
  species 
  but 
  it 
  was 
  in 
  some 
  

   numbers 
  at 
  this 
  place. 
  In 
  the 
  early 
  development 
  there 
  is 
  a 
  spiral 
  

   arrangement 
  of 
  the 
  chambers 
  before 
  the 
  alternating 
  character 
  is 
  

   taken 
  on 
  showing 
  the 
  relation 
  of 
  Spiroplecta 
  and 
  Textularia, 
  as 
  in 
  

   other 
  genera 
  of 
  the 
  Textulariidae. 
  This 
  coiling 
  brings 
  the 
  pro- 
  

   loculum 
  and 
  early 
  chambers 
  some 
  distance 
  in 
  from 
  the 
  periphery. 
  

   Often 
  the 
  proloculum 
  is 
  large, 
  apparently 
  megalospheric, 
  and 
  is 
  

   thicker 
  than 
  the 
  rest 
  of 
  the 
  test, 
  giving 
  an 
  umbonate 
  appearance 
  to 
  

   the 
  early 
  portion. 
  

  

  This 
  Tertiary 
  species 
  is 
  apparently 
  the 
  largest 
  of 
  the 
  genus. 
  

  

  PAVONINA 
  ADVENA 
  Cushman 
  

  

  Pavonina 
  advena 
  Cushman, 
  U. 
  S. 
  Geol. 
  Survey 
  Prof. 
  Paper 
  133, 
  1923, 
  p. 
  24, 
  

   pi. 
  1, 
  fig. 
  10. 
  

  

  Test 
  of 
  comparatively 
  few 
  chambers, 
  only 
  the 
  very 
  early 
  ones 
  

   showing 
  a 
  trace 
  of 
  the 
  biserial 
  arrangement; 
  succeeding 
  chambers 
  

   rapidly 
  increasing 
  in 
  width 
  until 
  an 
  annular 
  chamber 
  is 
  developed; 
  

   wall 
  thin, 
  translucent, 
  finely 
  punctate, 
  otherwise 
  smooth. 
  

  

  Diameter 
  slightly 
  less 
  than 
  0.50 
  mm. 
  

  

  This 
  somewhat 
  resembles 
  P. 
  flabelliformis, 
  which 
  is 
  characteristic 
  

   of 
  certain 
  parts 
  of 
  the 
  Indo-Pacific 
  region 
  in 
  shallow 
  water 
  but 
  

   which 
  has 
  much 
  coarser 
  pores. 
  It 
  is 
  less 
  closely 
  like 
  P. 
  atlantica, 
  

   which 
  I 
  have 
  described 
  from 
  material 
  obtained 
  off 
  the 
  Florida 
  coast. 
  

  

  The 
  types 
  were 
  from 
  U. 
  S. 
  G. 
  S. 
  station 
  7376, 
  from 
  Byram 
  marl, 
  

   Lower 
  Oligocene, 
  Leaf 
  River, 
  Miss. 
  

  

  There 
  are 
  two 
  other 
  species 
  described 
  from 
  the 
  Tertiary 
  of 
  Europe, 
  

   Pavonina 
  agglutinans 
  Schubert 
  and 
  P. 
  liburnica 
  Stache, 
  but 
  I 
  have 
  

   been 
  unable 
  to 
  obtain 
  specimens 
  of 
  these. 
  

  

  Pavonina 
  liburnica 
  Stache 
  25 
  does 
  not 
  from 
  the 
  figures 
  seem 
  to 
  be 
  a 
  

   species 
  of 
  this 
  genus, 
  and 
  it 
  is 
  difficult 
  to 
  place 
  it 
  without 
  seeing 
  type 
  

   material. 
  

  

  "A 
  bhandl.k.k. 
  geol. 
  Reichs., 
  vol. 
  13, 
  1889, 
  p. 
  89, 
  pi. 
  6a, 
  figs. 
  1 
  -19. 
  

  

  