﻿NO. 
  1969. 
  

  

  FOUR 
  NEW 
  SPECIES 
  OF 
  FOSSIL 
  HORSES— 
  HAY. 
  

  

  575 
  

  

  In 
  the 
  case 
  of 
  the 
  tooth 
  of 
  figure 
  14 
  the 
  fore-and-aft 
  diameter 
  is 
  

   taken 
  about 
  25 
  mm. 
  below 
  the 
  grmding 
  surface, 
  because 
  there 
  the 
  

   normal 
  dimension 
  is 
  reached. 
  The 
  diameter 
  of 
  the 
  actual 
  surface 
  is 
  

   28 
  mm. 
  The 
  tooth 
  of 
  figure 
  15 
  is 
  longer 
  than 
  the 
  others, 
  because 
  it 
  is 
  

   the 
  hindermost 
  tooth. 
  It 
  will 
  be 
  observed 
  that 
  in 
  length 
  of 
  grinding 
  

   surface 
  these 
  teeth 
  agree 
  with 
  the 
  upper 
  molars 
  of 
  E. 
  leidyi, 
  being 
  too 
  

   small 
  to 
  belong 
  to 
  E.fraternus 
  and 
  too 
  large 
  to 
  have 
  armed 
  the 
  lower 
  

  

  Figs. 
  11-15.— 
  11, 
  Equus 
  leidyi. 
  X 
  1- 
  Right 
  upper 
  premolar. 
  Amer. 
  Mus. 
  Nat. 
  Hist. 
  12-15, 
  

   Equus 
  fraterntjs. 
  X 
  1- 
  12, 
  Right 
  upper 
  premolar? 
  Amer. 
  Mus. 
  Nat. 
  Hist. 
  13, 
  Lower 
  

   right 
  molar 
  or 
  premolar. 
  40S6, 
  Wagner. 
  14, 
  Lower 
  right 
  molar 
  or 
  premolar. 
  4086, 
  

   Wagner. 
  15, 
  Lower 
  left 
  last 
  molar. 
  4086, 
  Wagner. 
  

  

  jaw 
  of 
  the 
  species 
  next 
  to 
  be 
  described. 
  Figure 
  16 
  represents 
  a 
  lower 
  

   left 
  premolar 
  or 
  molar 
  from 
  Alifia 
  River, 
  Florida. 
  The 
  height 
  of 
  the 
  

   crown 
  is 
  61 
  mm., 
  its 
  length 
  27 
  mm., 
  its 
  width 
  11.5 
  mm. 
  on 
  the 
  worn 
  

   face, 
  but 
  lower 
  down 
  13 
  mm. 
  It 
  differs 
  from 
  the 
  teeth 
  of 
  figures 
  13, 
  

   14, 
  and 
  15 
  in 
  the 
  more 
  plicated 
  enamel. 
  

  

  Figs. 
  16-18.— 
  16, 
  Equus 
  leidyi. 
  x 
  1. 
  Lower 
  left 
  molar 
  or 
  premolar. 
  

   Amer. 
  Mus. 
  Nat. 
  Hist. 
  17-18, 
  Equus 
  littoralis. 
  X 
  1. 
  17, 
  Upper 
  

   LEFT 
  molar. 
  Type. 
  4086, 
  Wagner. 
  18, 
  Upper 
  left 
  molar. 
  4086, 
  

   Wagner. 
  

  

  EQUUS 
  LITTORALIS, 
  new 
  species. 
  

  

  Type. 
  — 
  One 
  of 
  six 
  teeth 
  in 
  the 
  Wagner 
  Free 
  Institute 
  of 
  Science, 
  

   Philadelphia, 
  which 
  have 
  the 
  No. 
  4086. 
  Found 
  in 
  supposed 
  Pleisto- 
  

   cene 
  deposits 
  on 
  Peace 
  Creek, 
  Florida. 
  

  

  Characterized 
  by 
  teeth 
  of 
  small 
  size, 
  the 
  grinding 
  surface 
  of 
  the 
  first 
  

   molars 
  having 
  a 
  length 
  and 
  a 
  width 
  of 
  about 
  21 
  mm. 
  Enamel 
  sur- 
  

   rounding 
  the 
  lakes 
  rather 
  strongly 
  folded. 
  The 
  crown 
  somewhat 
  

   more 
  curved 
  than 
  in 
  E. 
  leidyi. 
  

  

  Accompanying 
  the 
  teeth 
  found 
  by 
  Mr. 
  Willcox 
  on 
  Peace 
  Creek, 
  as 
  

   mentioned 
  on 
  page 
  573, 
  are 
  others 
  which 
  belonged 
  to 
  a 
  smaller 
  horse 
  

   than 
  that 
  described 
  as 
  E. 
  leidyi. 
  Two 
  of 
  these 
  teeth 
  are 
  left 
  upper 
  

   molars 
  and 
  are 
  shown 
  in 
  figures 
  17 
  and 
  18. 
  To 
  this 
  horse, 
  believed 
  

  

  