﻿Ill] 
  Speciai, 
  Report 
  No. 
  6 
  : 
  Cretaceous 
  Fossils 
  293 
  

  

  G. 
  niutabilis 
  Morton, 
  ibid., 
  pp. 
  81-83, 
  pl- 
  4> 
  fig- 
  3- 
  

  

  G. 
  convexa 
  Morton, 
  Synopsis, 
  etc., 
  1834, 
  p. 
  53, 
  pi. 
  4, 
  figs. 
  

  

  I 
  and 
  2. 
  

   G. 
  mutabilis 
  Morton, 
  ibid., 
  fig. 
  3. 
  

   G. 
  vesicularis 
  White, 
  4th 
  Ann. 
  Rept. 
  U. 
  S. 
  G. 
  S., 
  p. 
  303, 
  

  

  pi. 
  48, 
  figs. 
  1-5. 
  

   " 
  G 
  vesicularis 
  Lam 
  ? 
  " 
  Whitf., 
  U. 
  S. 
  G. 
  S., 
  Mon., 
  9, 
  p. 
  36, 
  

   pi. 
  3, 
  figs. 
  15 
  and 
  13, 
  pi. 
  4, 
  figs. 
  1-3, 
  pi. 
  5, 
  1885. 
  

   This 
  species 
  is 
  widely 
  distributed 
  in 
  the 
  Cretaceous 
  of 
  the 
  

   Atlantic 
  and 
  Gulf 
  States. 
  It 
  also 
  occurs 
  in 
  beds 
  of 
  like 
  horizon 
  

   in 
  Europe. 
  The 
  Arkansas 
  and 
  Texas 
  form 
  of 
  this 
  species 
  is 
  the 
  

   same 
  as 
  the 
  one 
  herewith 
  figured. 
  

  

  Locality. 
  — 
  Ray 
  burn's 
  salt 
  w^ork, 
  Bienville 
  parish, 
  La. 
  

   Ostrea 
  larva, 
  Plate 
  49, 
  fig. 
  3, 
  

  

  Syn. 
  — 
  O. 
  larva 
  Lam., 
  An. 
  sans 
  Vert., 
  vol. 
  6, 
  p. 
  216, 
  1819. 
  

  

  O.falcata 
  Morton, 
  Jr. 
  Acad. 
  Nat. 
  Sci. 
  Phila., 
  vol. 
  6, 
  

  

  pi. 
  I, 
  fig. 
  2. 
  

   O.falcata 
  Morton, 
  Synop. 
  Org. 
  Rem. 
  Cret. 
  Group, 
  U. 
  S., 
  

  

  1834, 
  p. 
  50, 
  pi. 
  3, 
  fig. 
  5, 
  pi. 
  9, 
  figs. 
  6, 
  7. 
  

   O. 
  {Alectryonia) 
  larva 
  White, 
  U. 
  S. 
  Geol. 
  Surv., 
  4th 
  Ann. 
  

   Rep., 
  1884, 
  p. 
  296, 
  pi. 
  42, 
  figs. 
  2-9. 
  

   This 
  is 
  a 
  very 
  common 
  species 
  from 
  the 
  Upper 
  Cretaceous 
  of 
  

   the 
  Atlantic 
  sea 
  border 
  and 
  Gulf 
  States. 
  It 
  occurs 
  also 
  in 
  beds 
  

   of 
  similar 
  age 
  in 
  Europe 
  and 
  southern 
  Asia. 
  

  

  Locality. 
  — 
  Rayburn's 
  salt 
  work, 
  Bienville 
  parish. 
  La. 
  

  

  Ostrea 
  plumosa, 
  Plate 
  49, 
  fig. 
  4. 
  

  

  Syn. 
  — 
  O. 
  plumosa 
  Mort., 
  Synopsis 
  Organic 
  Remains, 
  Cretaceous 
  

   Group, 
  U. 
  S., 
  p. 
  51, 
  pi. 
  3, 
  fig. 
  9, 
  1834. 
  

   O. 
  plumosa 
  Whitf., 
  U. 
  S. 
  Geol. 
  Surv., 
  Mon. 
  9, 
  p. 
  31, 
  pi. 
  

   3, 
  figs. 
  12, 
  13, 
  1885. 
  

   Our 
  specimens 
  do 
  not 
  show 
  such 
  coarse 
  radii 
  as 
  Morton's 
  fig- 
  

   ure 
  indicates, 
  nor 
  do 
  they 
  show 
  the 
  undulations 
  indicated 
  by 
  

   Whitfield's 
  figures. 
  Yet 
  we 
  feel 
  little 
  hesitation 
  in 
  assigning 
  

   them 
  to 
  this 
  species. 
  

  

  Originally 
  described 
  from 
  Arneytown, 
  N. 
  J. 
  

   Locality. 
  — 
  Rayburn's 
  salt 
  works, 
  La. 
  

  

  