﻿VEETEBEATES. 
  77 
  

  

  by 
  transverse 
  undulations 
  conforming 
  to 
  the 
  inner 
  margin, 
  the 
  

   narrow 
  intervening 
  grooves 
  showing 
  coarse 
  and 
  irregularly 
  elongate 
  

   punctae 
  which 
  elsewhere 
  present 
  at 
  the 
  triturating 
  surface 
  merely 
  

   circular 
  orifices 
  spaced 
  by 
  twice 
  or 
  thrice 
  their 
  own 
  diameter. 
  The 
  

   original 
  specimen 
  measures 
  in 
  transverse 
  diameter 
  between 
  the 
  

   inner 
  angles 
  about 
  38 
  m 
  m. 
  ; 
  greatest 
  length 
  above 
  50 
  m 
  m. 
  

  

  The 
  above 
  species 
  was 
  originally 
  described 
  from 
  a 
  unique 
  imper- 
  

   fect 
  example, 
  and 
  the 
  very 
  few 
  subsequent 
  accessions 
  are 
  even 
  

   more 
  fragmentary, 
  and 
  none 
  are 
  sufficiently 
  entire 
  to 
  give 
  the 
  exact 
  

   proportions 
  of 
  the 
  perfect 
  tooth. 
  The 
  fragments 
  are, 
  however, 
  

   readily 
  recognizable 
  by 
  their 
  peculiar 
  coronal 
  contour 
  and 
  transverse 
  

   undulations. 
  In 
  the 
  light 
  of 
  these 
  imperfect 
  data, 
  there 
  appears 
  to 
  

   be 
  specific 
  identity 
  between 
  the 
  Keokuk 
  teeth 
  and 
  a 
  couple 
  of 
  

   fragments 
  of 
  the 
  same 
  forms 
  discovered 
  by 
  Mr. 
  Van 
  Home 
  in 
  the 
  

   Warsaw 
  beds 
  ; 
  the 
  Keokuk 
  specimens 
  are 
  more 
  worn 
  and 
  present 
  a 
  

   less 
  strongly 
  undulated 
  surface 
  than 
  obtains 
  in 
  the 
  Warsaw 
  

   examples, 
  which 
  otherwise, 
  in 
  outline, 
  proportions 
  and 
  general 
  

   coronal 
  contour, 
  agree 
  well 
  with 
  the 
  Keokuk 
  teeth. 
  A 
  fragment 
  of 
  

   another 
  specimen, 
  from 
  the 
  St. 
  Louis 
  formation, 
  near 
  Pella, 
  Iowa, 
  

   representing 
  a 
  tooth 
  of 
  the 
  ordinary 
  size 
  attained 
  by 
  the 
  present 
  

   species, 
  is 
  also 
  undistinguishable 
  from 
  the 
  individuals 
  just 
  mentioned. 
  

   The 
  present 
  form 
  presents 
  marked 
  contrasts 
  with 
  that 
  noticed 
  from 
  

   the 
  Chester 
  formation 
  under 
  the 
  head 
  of 
  Tceniodus 
  obliquus, 
  as 
  

   remarked 
  in 
  the 
  observations 
  appended 
  to 
  the 
  diagnosis 
  of 
  the 
  

   latter 
  species. 
  

  

  Geological 
  positions 
  and 
  localities 
  : 
  Keokuk 
  limestone, 
  Warsaw 
  and 
  

   Hamilton, 
  Illinois. 
  Also, 
  sp. 
  ?, 
  Warsaw 
  limestone, 
  above 
  Alton, 
  

   111. 
  ; 
  and 
  sp. 
  ?, 
  St. 
  Louis 
  formation, 
  Pella, 
  Iowa. 
  

  

  T&;niodus 
  eegulakis, 
  St. 
  J. 
  and. 
  W. 
  

   PI, 
  XIII. 
  Fig. 
  n. 
  

  

  Teeth 
  of 
  large 
  size. 
  Maxillary 
  posterior 
  (?) 
  form 
  subrfrhomoidal 
  

   in 
  outline, 
  moderately 
  arched 
  in 
  the 
  direction 
  of 
  inrollment. 
  

   Antero-lateral 
  border 
  very 
  oblique 
  in 
  its 
  forward 
  and 
  outward 
  

   course, 
  the 
  coronal 
  belt 
  nearly 
  vertical 
  and 
  comprising 
  half 
  

   the 
  height 
  of 
  the 
  border, 
  a 
  slight 
  sulcus 
  defining 
  it 
  from 
  the 
  basal 
  

   portion, 
  the 
  inferior 
  edge 
  of 
  which 
  is 
  broken 
  away; 
  postero-lateral 
  

   border 
  almost 
  parallel 
  with 
  the 
  opposite 
  side, 
  making 
  an 
  angle 
  of 
  

   about 
  55° 
  with 
  a 
  line 
  drawn 
  between 
  the 
  angles 
  of 
  the 
  inner 
  

  

  