﻿l:;i 
  PAL.KONTnLocY 
  OF 
  [LLINOl 
  

  

  the 
  extreme 
  angles 
  of 
  the 
  inner 
  margin 
  19 
  mm.; 
  length 
  along 
  

   antero-lateral 
  border 
  3 
  mm. 
  

  

  The 
  above 
  described 
  forms 
  are 
  about 
  equally 
  numerously 
  repre- 
  

   sented 
  in 
  individuals 
  in 
  the 
  collections, 
  although 
  the 
  specimens 
  are 
  

   in 
  a 
  more 
  or 
  less 
  fragmentary 
  state 
  of 
  preservation. 
  The 
  discovery 
  

   by 
  Mr. 
  Vim 
  Home 
  of 
  the 
  mandible 
  bearing 
  the 
  posterior 
  pair 
  

   teeth, 
  and 
  showing 
  the 
  proximal 
  articular 
  extremity 
  the 
  right 
  

   ramus 
  and 
  the 
  somewhat 
  produced, 
  laterally 
  narrowed 
  extremity 
  in 
  

   the 
  region 
  of 
  the 
  symphysis, 
  is 
  tin- 
  most 
  interesting 
  in 
  connection 
  

   with 
  the 
  genus. 
  The 
  semi-ossilied 
  tissue 
  of 
  the 
  mandible 
  in 
  ti 
  

   instance 
  seems 
  to 
  have 
  remarkably 
  intimate 
  connection 
  with 
  the 
  

   dental 
  plates, 
  and 
  preserved 
  in 
  such 
  a 
  manner 
  a- 
  to 
  have 
  the 
  

   appearance 
  of 
  a 
  cylindrical 
  scroll, 
  the 
  inferior 
  or 
  inner 
  margin 
  

   being 
  brought 
  round 
  to 
  the 
  exterior 
  side, 
  as 
  the 
  specimen 
  rests 
  in 
  

   the 
  limestone 
  matrix. 
  It 
  forms 
  a 
  thin 
  plate 
  whose 
  wails 
  have 
  been 
  

   brought 
  iuto 
  contact 
  by 
  pressure, 
  but 
  posteriorly 
  it 
  probably 
  

   shows 
  its 
  normal 
  shape 
  and 
  dimensions, 
  where 
  it 
  p 
  

   oentifonn 
  excavation 
  with 
  the 
  condyloid 
  or 
  inferior 
  process 
  m 
  

   produced 
  posteriorly, 
  the 
  superior 
  process 
  relatively 
  - 
  an- 
  

  

  teriorly 
  in 
  the 
  region 
  of 
  the 
  symphysis, 
  the 
  mandible 
  is 
  li 
  - 
  

   tinctly 
  outlined. 
  It 
  is 
  moderately 
  produced 
  and 
  apparently 
  obtusely 
  

   rounded, 
  the 
  rami 
  meeting 
  at 
  the 
  symphysis 
  but 
  not 
  anoh] 
  

   and 
  bearing 
  either 
  side 
  a 
  slight 
  protuberance 
  elongated 
  parallel 
  with 
  

   the 
  symphysicaJ 
  line, 
  but 
  without 
  a 
  vestige 
  of 
  the 
  dental 
  plates 
  to 
  

   which 
  th.y 
  afforded 
  support. 
  The 
  1 
  a 
  1 
  1 
  < 
  r 
  -H**re- 
  evidently 
  ol 
  were 
  

  

  small 
  si/r, 
  ami 
  if, 
  as 
  in 
  Cochliodus, 
  the 
  distal 
  extremity 
  of 
  the 
  rami 
  

   w.re 
  armed 
  with 
  a 
  median 
  and 
  anterior 
  convoluted 
  plate, 
  their 
  ex- 
  

   treme 
  diminutiveness 
  may 
  account 
  for 
  their 
  absence 
  in 
  the 
  col!. 
  

  

  tionS. 
  The 
  same 
  OOndUBion 
  18 
  al80 
  permissible 
  ill 
  P 
  to 
  the 
  

  

  anterior 
  dentary 
  elements 
  of 
  the 
  upper 
  jaw. 
  

  

  logical 
  position 
  <in<l 
  localities 
  3t. 
  Louis 
  limestone: 
  St. 
  I. 
  

   Mo. 
  ; 
  Alton. 
  111. 
  ; 
  Telia. 
  Iowa. 
  

  

  