﻿188 
  1\\L 
  KONTOLOGY 
  OF 
  ILLINOI 
  

  

  afforded 
  Mr. 
  Van 
  Home 
  three 
  individuals, 
  one 
  <'f 
  which 
  is 
  doubt- 
  

   ful, 
  the 
  others 
  representing 
  the 
  forms 
  identified 
  with 
  the 
  | 
  

  

  teeth 
  of 
  the 
  upper 
  and 
  lower 
  jaws. 
  There 
  are 
  also 
  a 
  couple 
  of 
  

   similar 
  specimens 
  from 
  the 
  same 
  horizon, 
  one 
  from 
  Monroe 
  county 
  

   ami 
  the 
  other 
  was 
  found 
  by 
  Master 
  Willis 
  Worthen 
  at 
  Golden 
  

   Bluffs, 
  mar 
  Warsaw, 
  in 
  this 
  State. 
  From 
  Indiana 
  localities, 
  proba- 
  

   bly 
  on 
  equivalent 
  strata, 
  we 
  have 
  Been 
  similar 
  teeth, 
  hut 
  these 
  are 
  

   not 
  now 
  accessihle 
  to 
  us 
  for 
  critical 
  comparison. 
  

  

  With 
  a 
  single 
  exception, 
  all 
  of 
  the 
  above 
  mentioned 
  specimens 
  

   are 
  too 
  imperfect 
  to 
  allow 
  of 
  satisfactory 
  definition 
  and 
  oompa 
  

   with 
  the 
  species 
  known 
  from 
  other 
  formations, 
  hence 
  we 
  hesitate 
  to 
  

   undertake 
  their 
  discrimination 
  from 
  allied 
  species 
  which 
  they 
  cl 
  

   resemble, 
  occurring 
  in 
  earlier 
  and 
  later 
  formations. 
  The 
  small 
  im- 
  

   mature 
  individuals 
  of 
  Sandalodus 
  lavisrinuu, 
  of 
  the 
  Keokuk 
  lime- 
  

   stone, 
  offer 
  in 
  a 
  general 
  way 
  many 
  features 
  in 
  common 
  with 
  their 
  

   Warsaw 
  representatives 
  ; 
  while 
  the 
  Upper-Burlington 
  sp 
  , 
  S. 
  

   planatw, 
  especially 
  the 
  excessively 
  arched 
  examples 
  of 
  the 
  mandi- 
  

   bular 
  posterior 
  form, 
  strikingly 
  resemble 
  certain 
  individuals 
  occurring 
  

   in 
  the 
  Warsaw 
  beds. 
  On 
  the 
  other 
  hand, 
  the 
  latter 
  deposits 
  afford 
  

   specimens 
  of 
  the 
  same 
  form 
  which 
  might 
  readily 
  he 
  identified 
  with 
  

   that 
  belonging 
  to 
  S. 
  spatidatiu 
  of 
  the 
  succeeding 
  St. 
  Louis 
  forma- 
  

   tion. 
  We 
  are 
  well 
  aware 
  how 
  deceptive 
  are 
  the 
  characters 
  ait"' 
  

   by 
  imperfect 
  materials 
  in 
  this 
  £ioup 
  of 
  fossil 
  teeth, 
  especially 
  when 
  

   they 
  are 
  not 
  supplemented 
  by 
  a 
  large 
  number 
  of 
  examples 
  from 
  which 
  

   a 
  more 
  cornpreheiiMvc 
  understanding 
  of 
  the 
  specific 
  characteristics 
  

   may 
  be 
  derived- 
  And 
  bo 
  far 
  as 
  relates 
  to 
  the 
  specimens 
  lure 
  par- 
  

   ticularly 
  alluded 
  to, 
  we 
  can 
  only 
  reiterate 
  the 
  facts 
  relating 
  to 
  their 
  

   resemblanoes, 
  leaving 
  those 
  that 
  may 
  he 
  regarded 
  as 
  peculiar 
  and 
  

   indicating 
  Bpecific 
  distinctness 
  for 
  future 
  amplification 
  and 
  demon- 
  

   stration. 
  

  

  logical 
  position 
  and 
  l<><;iHtii.< 
  .■ 
  Warsaw 
  limestone 
  . 
  Warsaw; 
  1 
  

   creek 
  above 
  Alton, 
  and 
  Monro 
  Co.. 
  ill. 
  

  

  BaNDALODUB 
  mvhi.au-. 
  N. 
  and 
  W. 
  

  

  pl 
  in. 
  Fig 
  t. 
  

  

  Mandibular 
  median 
  teeth 
  small, 
  trapesoidal 
  in 
  outline, 
  moderately 
  

  

  arched 
  in 
  the 
  direction 
  of 
  lurolliueiit. 
  hre.idth 
  apparently 
  exceeding 
  

  

  