﻿102 
  l'AL.KoNoToLOCY 
  OF 
  ILLINOIS. 
  

  

  opposed 
  articular 
  border 
  of 
  the 
  terminal 
  tooth, 
  basal 
  border 
  deep, 
  

   inbeveled, 
  doable-furrowed, 
  terminating 
  Lnferiorly 
  in 
  a 
  narrow 
  rim, 
  

   and 
  bordered 
  above 
  by 
  the 
  relatively 
  strong, 
  rounded, 
  inbeveled, 
  

   enamel 
  fold; 
  anterolateral 
  border 
  relatively 
  very 
  sh> 
  rt^ 
  The 
  

   enamel 
  fold 
  inbeveled 
  to 
  the 
  channeled 
  basal 
  border 
  and 
  constitut- 
  

   ing 
  more 
  than 
  half 
  the 
  height 
  of 
  the 
  border; 
  inner 
  margin 
  mak- 
  

   ing 
  a 
  Blight 
  Bigmoidal 
  curvature 
  from 
  the 
  acutely 
  rounded 
  posterior 
  

   angle 
  to 
  the 
  obtuse 
  anterior 
  angle, 
  inieriorly 
  inbeveled 
  in 
  worn 
  i 
  

   amples. 
  Coronal 
  surface 
  nearly 
  plane 
  transversely, 
  culminating 
  in 
  

   a 
  low, 
  obscurely 
  denned 
  ridge 
  close 
  upon 
  and 
  parallel 
  with 
  the 
  

   postero-lateral 
  border, 
  the 
  broad 
  anterior 
  slope 
  merging 
  into 
  the 
  

   very 
  shallow 
  depressed 
  belt 
  traversing 
  the 
  anterior 
  portion 
  of 
  the 
  

   coronal 
  area 
  ; 
  surface 
  marked 
  by 
  distinct 
  transverse 
  undulaL 
  

   and 
  furrows 
  parallel 
  with 
  the 
  inner 
  margin, 
  inner 
  edge 
  envelo] 
  

   in 
  a 
  dense 
  enamel 
  coating, 
  immediately 
  forward 
  of 
  which 
  the 
  worn 
  

   surface 
  exhibits 
  irregular 
  verruoese 
  markings, 
  and 
  over 
  the 
  much 
  

   worn 
  outer 
  half 
  the 
  usual 
  punctate 
  structure 
  appears, 
  the 
  punots 
  

   displaying 
  marked 
  tendency 
  to 
  irregular 
  elongation 
  in 
  various 
  dii 
  

   tions, 
  in 
  all 
  which 
  particulars 
  the 
  teeth 
  bear 
  most 
  intimate 
  resem- 
  

   blance 
  to 
  the 
  associated 
  forms 
  of 
  the 
  species. 
  A 
  mature 
  tooth 
  

   measures 
  across 
  the 
  inner 
  margin 
  7.8 
  mm; 
  along 
  the 
  postero-lateral 
  

   border 
  to 
  point 
  of 
  inrollnicnt 
  about 
  10.5 
  mm; 
  antero-lateral 
  border 
  

   about 
  -1mm. 
  

  

  Maxillary 
  posterior 
  teeth 
  narrow 
  triangular 
  or 
  subcuneate 
  in 
  out- 
  

   line, 
  gently 
  arched 
  longitudinally. 
  The 
  anterior 
  portion 
  of 
  the 
  inner 
  

   margin 
  diverges 
  at 
  a 
  very 
  Blight 
  angle 
  with 
  the 
  anterolateral 
  i 
  

   dor, 
  or 
  making 
  nearly 
  a 
  right 
  angle 
  with 
  the 
  portion 
  behind 
  the 
  

  

  abruptly 
  rounded 
  base 
  of 
  the 
  Coronal 
  ridge, 
  slightly 
  concave 
  in 
  

  

  passing 
  the 
  posterior 
  depression 
  into 
  the 
  slightly 
  produced 
  posterior 
  

   angle; 
  postero-lateral 
  border 
  very 
  gradually 
  converging 
  toward 
  the 
  

   outer 
  extremity, 
  which 
  is 
  suddenly 
  inroUed; 
  both 
  the 
  an: 
  

  

  and 
  the 
  postero-lateral 
  borders 
  are 
  marked 
  by 
  the 
  narrow 
  enamel 
  

   fold, 
  inbeveled 
  to 
  the 
  channeled 
  basal 
  border, 
  which 
  latter 
  in 
  the 
  

  

  anterior 
  border 
  L 
  lingiy 
  shallow 
  compared 
  with 
  it 
  

  

  inbeveled 
  depth 
  in 
  the 
  posterior 
  border. 
  Corona] 
  promii 
  

  

  abruptly 
  from 
  the 
  anterolateral 
  border, 
  regularly 
  arched 
  tltUU 
  

  

  more 
  gently 
  descending 
  into 
  the 
  posterior 
  depression, 
  wind. 
  

   traversed 
  by 
  a 
  faint 
  angulation 
  denning 
  the 
  inner 
  limits 
  of 
  the 
  

  

  narrow 
  and 
  somewhat 
  sharply 
  uprai-ed 
  posterior 
  wing. 
  Sin 
  : 
  

  

  markii 
  eing 
  with 
  whal 
  has 
  already 
  been 
  observed 
  in 
  relation 
  

  

  the 
  opposi 
  i 
  mandibular 
  teeth, 
  even 
  to 
  the 
  details 
  of 
  tl 
  alar 
  

  

  