﻿PAL.KoNTOLOGY 
  OF 
  1 
  I.LI 
  No! 
  

  

  the 
  Keokuk 
  form, 
  Pnigeaeanthtu 
  pnigeiu 
  ' 
  (N. 
  and 
  W.. 
  sp.'. 
  fr«.m 
  

  

  which 
  it 
  is 
  distinguished 
  by 
  its 
  somewhat 
  Btonter 
  proportions, 
  less 
  

  

  ly 
  concave 
  posterior 
  bonier, 
  and 
  the 
  peculiar 
  tubereulation 
  of 
  

  

  the 
  borders. 
  The 
  general 
  oharaoter 
  of 
  the 
  tubereulation 
  of 
  the 
  

  

  il 
  surfaces 
  is 
  much 
  the 
  same 
  in 
  both 
  forms, 
  but 
  in 
  th« 
  

   one 
  the 
  tubercles 
  are 
  relatively 
  smaller 
  and 
  less 
  erowded. 
  

  

  logical 
  position 
  and 
  locality: 
  St. 
  Louis 
  lii 
  . 
  Illinois. 
  

  

  i. 
  We 
  are 
  under 
  obligations 
  to 
  S. 
  A. 
  Miller, 
  V.r-i 
  . 
  f..r 
  remlndloa 
  U 
  of 
  our 
  remissness 
  

   ! 
  I 
  • 
  ■ 
  ■ 
  — 
  i 
  >- 
  adding 
  to 
  the 
  already 
  burdei 
  

   tied 
  in 
  abandoning 
  t 
  ti 
  . 
  - 
  original 
  

   we 
  transferred 
  it 
  to 
  a 
  distinct 
  genus, 
  ol 
  which 
  

  

  

  