﻿584 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  It 
  is 
  very 
  probable 
  that 
  the 
  width 
  of 
  the 
  firet 
  true 
  molar 
  would 
  

   have 
  been 
  considerably 
  greater 
  after 
  it 
  had 
  been 
  worn 
  down 
  further. 
  

   It 
  wiU 
  be 
  observed 
  that 
  the 
  outer 
  valley 
  pushes 
  itself 
  in 
  between 
  the 
  

   ends 
  of 
  the 
  two 
  longitudinal 
  valleys 
  in 
  the 
  second 
  and 
  third 
  molars. 
  

   The 
  first 
  permanent 
  incisor 
  is 
  19 
  mm. 
  wide 
  and 
  the 
  cup 
  is 
  complete. 
  

  

  From 
  all 
  ordinary 
  specimens 
  of 
  Equus 
  complicatus 
  this 
  species 
  is 
  

   distinguished 
  by 
  the 
  smaller 
  teeth 
  and 
  by 
  the 
  far 
  simpler 
  arrange- 
  

   ment 
  of 
  the 
  enamel. 
  It 
  is 
  distinguished 
  in 
  the 
  same 
  way 
  from 
  E. 
  scotti. 
  

   In 
  neither 
  of 
  the 
  species 
  just 
  named 
  does 
  the 
  post-protoconal 
  val- 
  

   ley 
  usually 
  extend 
  so 
  near 
  the 
  outer 
  wall 
  of 
  the 
  tooth 
  as 
  it 
  does 
  in 
  

   E. 
  niohrarensis. 
  

  

  It 
  is 
  important 
  that 
  this 
  species 
  should 
  be 
  distinguished 
  from 
  E, 
  

   excelsus, 
  which 
  has 
  teeth 
  of 
  practically 
  the 
  same 
  size. 
  For 
  compari- 
  

   sons 
  see 
  page 
  592. 
  

  

  EQUUS 
  LAURENTIUS, 
  new 
  species. 
  

  

  Type. 
  — 
  A 
  nearly 
  complete 
  skull 
  now 
  in 
  the 
  University 
  of 
  Kansas 
  

   and 
  having 
  the 
  catalogue 
  number 
  347. 
  Derived 
  from 
  supposed 
  Pleis- 
  

   tocene 
  deposits 
  near 
  Lawrence, 
  Kansas. 
  

  

  Characterized 
  by 
  rather 
  small 
  teeth, 
  the 
  length 
  of 
  tha 
  first 
  upper 
  

   molar 
  being 
  about 
  22 
  mm., 
  the 
  width 
  about 
  23 
  mm. 
  Enamel 
  of 
  the 
  

   lakes 
  only 
  moderately 
  folded. 
  

  

  Through 
  the 
  generosity 
  of 
  the 
  paleontological 
  department 
  of 
  tha 
  

   University 
  of 
  Kansas, 
  at 
  the 
  head 
  of 
  which 
  is 
  Prof. 
  C. 
  E. 
  McClung, 
  

   the 
  writer 
  is 
  permitted 
  to 
  describe 
  a 
  skull 
  of 
  a 
  horse 
  found 
  near 
  

   Lawrence, 
  which 
  the 
  writer 
  regards 
  as 
  a 
  hitherto 
  undescribed 
  species. 
  

   It 
  is 
  hereby 
  named 
  Equus 
  laurentius. 
  The 
  photographs 
  from 
  which 
  

   the 
  illustrations 
  of 
  the 
  skull 
  have 
  been 
  prepared 
  were 
  taken 
  under 
  

   the 
  supervision 
  of 
  Mr. 
  H. 
  T. 
  Martin, 
  of 
  the 
  department 
  of 
  paleon- 
  

   tology. 
  

  

  This 
  skull 
  (pis. 
  72, 
  73), 
  which 
  lacks 
  no 
  part 
  except 
  the 
  extremities 
  of 
  

   the 
  nasal 
  bones, 
  was 
  found 
  in 
  1910 
  on 
  a 
  sand 
  bar 
  on 
  the 
  north 
  side 
  

   of 
  the 
  Kansas 
  River 
  near 
  North 
  Lawrence. 
  Prof. 
  J. 
  E. 
  Todd 
  tells 
  

   the 
  writer 
  that 
  with 
  the 
  skull 
  were 
  found 
  the 
  femur 
  of 
  a 
  carnivore 
  

   and 
  the 
  base 
  of 
  an 
  elk's 
  antler. 
  The 
  femur 
  of 
  the 
  carnivore 
  has 
  been 
  

   identified 
  by 
  Prof. 
  Roy 
  L. 
  Moodie 
  as 
  belonging 
  probably 
  to 
  Smilodon. 
  

  

  In 
  1903 
  there 
  were 
  secured, 
  about 
  1 
  mile 
  north 
  of 
  the 
  place 
  where 
  

   the 
  skull 
  of 
  the 
  horse 
  was 
  found, 
  some 
  skulls 
  of 
  the 
  existing 
  bison, 
  

   besides 
  the 
  horn 
  core 
  and 
  hinder 
  part 
  of 
  the 
  skuU 
  of 
  a 
  bison 
  which 
  

   Professor 
  McClung 
  has 
  described 
  as 
  Bison 
  Icansensis. 
  The 
  locality 
  

   is 
  given 
  by 
  Professor 
  Todd 
  as 
  being 
  about 
  one-half 
  mile 
  north 
  of 
  

   Bismark 
  Grove, 
  which 
  is 
  itself 
  about 
  a 
  mile 
  and 
  a 
  half 
  east 
  of 
  North 
  

   Lawrence. 
  

  

  