﻿VEETEBEATES. 
  79 
  

  

  tooth, 
  coronal 
  enamel 
  forming 
  a 
  narrow 
  belt 
  rounded 
  to 
  the 
  basal 
  

   border, 
  which 
  was 
  probably 
  of 
  shallow 
  depth 
  ; 
  postero-lateral 
  border 
  

   converging 
  toward 
  point 
  of 
  inrollment 
  at 
  an 
  angle 
  of 
  about 
  35° 
  with 
  

   the 
  opposite 
  border, 
  and 
  similarly 
  defined 
  by 
  the 
  rounded 
  enamel 
  

   fold, 
  which 
  in 
  both 
  borders 
  shows 
  indistinct 
  traces 
  of 
  minute 
  crenu- 
  

   lation, 
  basal 
  rim 
  in 
  either 
  border 
  not 
  known 
  ; 
  inner 
  margin 
  making 
  

   a 
  broad 
  sigmoidal 
  curvature, 
  broadly 
  arched 
  round 
  the 
  base 
  of 
  the 
  

   coronal 
  prominence 
  from 
  the 
  subacute 
  posterior 
  angle, 
  with 
  a 
  moder- 
  

   ate 
  concavity 
  in 
  paesing 
  to 
  the 
  obtuse 
  anterior 
  augle, 
  in 
  worn 
  speci- 
  

   mens 
  inbeveled 
  interiorly. 
  Coronal 
  prominence 
  occupying 
  three- 
  

   fourths 
  of 
  the 
  entire 
  area 
  of 
  the 
  crown 
  surface, 
  moderately 
  elevated 
  

   and 
  broadly 
  arched 
  transverely, 
  the 
  broader 
  slope 
  regularly 
  rising 
  

   from 
  the 
  postero-lateral 
  border 
  into 
  the 
  nearly 
  median 
  low 
  crest 
  and 
  

   slightly 
  more 
  steeply 
  sloped 
  into 
  the 
  shallow 
  depressed 
  belt 
  occupy- 
  

   ing 
  the 
  anterior 
  portion 
  of 
  the 
  surface 
  ; 
  the 
  coronal 
  surface 
  is 
  

   traversed 
  by 
  strong, 
  more 
  or 
  less 
  regularly 
  spaced 
  undulations 
  

   parallel 
  with 
  the 
  inner 
  margin, 
  the 
  intervening 
  sulci 
  occupied 
  by 
  the 
  

   irregularly 
  elongated 
  orifices 
  of 
  the 
  medullary 
  tubes 
  which 
  elsewhere 
  

   appear 
  as 
  minute 
  circular 
  pits, 
  spaced 
  by 
  three 
  times 
  their 
  own 
  

   diameter, 
  surrounded 
  by 
  low 
  rims 
  with 
  faint 
  stellate 
  radiations 
  ; 
  in 
  

   worn 
  surfaces 
  the 
  transverse 
  undulations 
  become 
  obsolete, 
  though 
  

   the 
  position 
  of 
  the 
  sulci 
  is 
  still 
  plainly 
  discernible 
  by 
  the 
  parallel 
  

   bands 
  of 
  coarse 
  pores. 
  Greatest 
  lateral 
  diameter 
  of 
  a 
  medium 
  size 
  

   tooth 
  80 
  m. 
  m., 
  length 
  along 
  antero-lateral 
  border 
  to 
  point 
  of 
  inroll- 
  

   ment 
  about 
  15 
  m. 
  m. 
  

  

  The 
  above 
  described 
  form 
  which 
  was 
  discovered 
  by 
  Dr. 
  Hambach, 
  

   is 
  represented 
  by 
  three 
  individuals, 
  all 
  belonging 
  to 
  the 
  right 
  ramus 
  

   of 
  the 
  upper 
  jaw, 
  one 
  only 
  presenting 
  a 
  nearly 
  entire 
  tooth. 
  This 
  

   is 
  sufficiently 
  perfect 
  to 
  permit 
  satisfactory 
  comparison 
  with 
  con- 
  

   generic 
  forms 
  and 
  the 
  discrimination 
  of 
  its 
  specific 
  peculiarities. 
  

   Intimately 
  allied 
  to 
  the 
  earlier 
  occurring 
  species, 
  it 
  is 
  at 
  the 
  same 
  

   time 
  distinguishable 
  from 
  that 
  described 
  from 
  the 
  Warsaw 
  horizon 
  

   of 
  Indiana, 
  Tcenioclus 
  regularis, 
  by 
  its 
  relatively 
  narrower 
  propor- 
  

   tions 
  and 
  more 
  oblique 
  outline; 
  /it 
  differs 
  from 
  T..fasciatus, 
  of 
  the 
  

   Keokuk 
  formation, 
  as 
  also 
  the 
  form 
  provisionally 
  identified 
  with 
  

   that 
  species 
  from 
  the 
  Warsaw 
  beds 
  above 
  Alton, 
  both 
  in 
  its 
  greater 
  

   obliquity 
  and 
  transverse 
  diameter. 
  At 
  the 
  same 
  time 
  it 
  bears 
  a 
  

   general 
  resemblance 
  to 
  the 
  Belgian 
  species 
  T. 
  contortus, 
  De 
  Kon., 
  

   which 
  latter, 
  however, 
  is 
  relatively 
  longer, 
  the 
  enamel 
  fold 
  of 
  the 
  

   lateral 
  borders 
  much 
  more 
  strongly 
  developed, 
  and 
  in 
  the 
  distinct 
  

   depression 
  of 
  the 
  posterior 
  slope 
  of 
  the 
  crown 
  surface. 
  

  

  