﻿•2U2 
  

  

  PAL.EOXTOLOGY 
  OF 
  ILLINOIS. 
  

  

  PBAMHQDUB 
  S 
  i 
  i 
  ; 
  i 
  n 
  < 
  . 
  i 
  : 
  i 
  ; 
  i 
  . 
  St. 
  J. 
  and 
  W. 
  

  

  PL 
  XX, 
  Fie. 
  4-11. 
  

  

  Mandibular 
  teeth 
  rhomboidal 
  in 
  

   outline, 
  variable 
  in 
  tin- 
  pro] 
  

   tionfl 
  of 
  lengtfa 
  and 
  breadth; 
  an- 
  

   terior 
  and 
  posterior 
  margins 
  nearly 
  

  

  parallel 
  ; 
  very 
  gently 
  and 
  in 
  

   larly 
  curved 
  forward, 
  the 
  coronal 
  

   belt 
  occupying 
  less 
  than 
  one-third 
  

   the 
  vertical 
  height 
  of 
  the 
  tooth, 
  

   extending 
  deepest 
  in 
  the 
  an'' 
  

   margin, 
  and 
  in 
  well 
  pn 
  .-* 
  rved 
  ex- 
  

   amples 
  crennlated 
  with 
  vertical 
  

   plica, 
  producing 
  an 
  exceedingly 
  

   beautiful 
  sculptured 
  belt 
  well 
  de- 
  

   fined 
  from 
  the 
  dicp 
  basal 
  portion 
  

   by 
  a 
  slight 
  inbeveled 
  band: 
  the 
  

   basal 
  portion 
  is 
  also 
  marked 
  by 
  

  

  r 
  mandibular 
  teeth 
  oi 
  irreffular 
  vertical 
  rue 
  worn 
  

  

  Sprir, 
  ° 
  

  

  lit:. 
  ». 
  Mandibular 
  Berlet 
  t- 
  surfaces 
  exposing 
  the 
  vo: 
  

  

  uniting 
  bui 
  , 
  ■ 
  , 
  , 
  i 
  

  

  b. 
  Transverse 
  profile 
  "f 
  mandibular 
  ous 
  structure 
  which 
  extends 
  to 
  the 
  

   Borios 
  

  

  mgitudlnal 
  profile 
  of 
  mandibular 
  dense, 
  thin 
  inferior 
  layer. 
  The 
  

  

  inner 
  border 
  is 
  usually 
  nearly 
  straight 
  and 
  vertical, 
  the 
  enamel 
  bell 
  

   continuous 
  with 
  that 
  of 
  the 
  margins, 
  though 
  Less 
  distinctly 
  sculptured 
  : 
  

   one 
  or 
  other 
  angle 
  of 
  the 
  border 
  is 
  truncated 
  at 
  a 
  alight 
  ai 
  

   present 
  ins 
  en 
  articular 
  facet 
  of 
  variable 
  extent, 
  though 
  not 
  a 
  

   well 
  denned 
  from 
  the 
  greater 
  articular 
  face. 
  Outer 
  border 
  presenting 
  

   a 
  more 
  or 
  less 
  rounded 
  angle 
  in 
  front, 
  gently 
  curved 
  and 
  terminating 
  

   in 
  a 
  more 
  or 
  less 
  produced 
  angle 
  or 
  Bpur 
  posteriorly; 
  th< 
  

   enamel 
  is 
  w< 
  11 
  defined 
  and 
  margined 
  posteriorly 
  by 
  a 
  widish 
  expan- 
  

   sion 
  of 
  the 
  basal 
  border, 
  which 
  is 
  continued 
  into 
  t! 
  iorspur. 
  

   Corona] 
  surface 
  very 
  gently 
  and 
  regularly 
  arched 
  longitudinally, 
  the 
  

   angles 
  of 
  the 
  posterior 
  and 
  anterior 
  margins 
  and 
  inner 
  articular 
  

   holder 
  sharply 
  defined, 
  that 
  along 
  the 
  outer 
  border 
  rounded 
  from 
  the 
  

   , 
  coronal 
  fold 
  of 
  that 
  side, 
  which 
  La 
  defined 
  by 
  a 
  nar- 
  

   row 
  impressed 
  In 
  h 
  usually 
  n 
  into 
  the 
  shallow 
  median 
  

   in, 
  from 
  which 
  rises 
  the 
  wider, 
  very 
  she) 
  that 
  

   ocoupies 
  the 
  inner 
  portion 
  of 
  the 
  Burfaoe. 
  In 
  bohm 
  «] 
  - 
  '1"' 
  

   corona] 
  surface 
  Bhows 
  distinctly 
  the 
  prismatic 
  structure, 
  the 
  minute 
  

  

  pUnCtS 
  bell 
  Hiihle. 
  

  

  