﻿FOUR 
  xYBTF 
  SPECIES 
  OF 
  FOSSIL 
  HORSES— 
  HAY. 
  

  

  573 
  

  

  the 
  species 
  there 
  is 
  taken 
  a 
  tooth 
  (fig. 
  7) 
  which 
  belongs 
  in 
  the 
  collec- 
  

   tion 
  of 
  the 
  Wagner 
  Free 
  Institute 
  and 
  which 
  is 
  one 
  of 
  six 
  found 
  some- 
  

   where 
  along 
  Peace 
  Creek 
  by 
  Mr. 
  Joseph 
  WiUcox. 
  It 
  is 
  impossible 
  

   that 
  all 
  these 
  teeth 
  belonged 
  to 
  the 
  same 
  individual, 
  and 
  they 
  prob- 
  

   ably 
  did 
  not 
  belong 
  all 
  to 
  the 
  same 
  species. 
  One 
  has 
  already 
  been 
  

   referred 
  to 
  the 
  species 
  which 
  it 
  seems 
  advisable 
  to 
  regard 
  as 
  E. 
  frater- 
  

   nus 
  (fig. 
  4). 
  Two 
  other 
  teeth 
  are 
  referred 
  to 
  the 
  species 
  here 
  described, 
  

   and 
  they 
  may 
  have 
  belonged 
  to 
  the 
  same 
  individual 
  (figs. 
  8, 
  9). 
  The 
  

   following 
  are 
  the 
  dimensions 
  of 
  these 
  teeth: 
  

  

  Tooth 
  of 
  fig. 
  7 
  (type) 
  

  

  Tooth 
  of 
  fig. 
  8 
  

  

  Tooth 
  of 
  fig.9 
  

  

  Figs. 
  4-10.— 
  4, 
  6, 
  10, 
  Eqitus 
  fraternus. 
  X 
  1. 
  4086, 
  Wagner. 
  4, 
  Right 
  upper 
  molar; 
  6, 
  Left 
  

  

  SECOND 
  AND 
  THIRD 
  PREMOLARS; 
  10, 
  RIGHT 
  UPPER 
  PREMOLAR? 
  5, 
  7, 
  8, 
  9, 
  EQUUS 
  LEIDYI. 
  X 
  1. 
  

  

  4086, 
  Wagner. 
  5, 
  Right 
  upper 
  premolar; 
  7, 
  Right 
  upper 
  molar. 
  Type. 
  8, 
  Right 
  upper 
  

   molar; 
  9, 
  Right 
  upper 
  premolar? 
  

  

  The 
  tooth 
  taken 
  as 
  the 
  type 
  is 
  believed 
  to 
  be 
  a 
  molar, 
  either 
  the 
  first 
  

   or 
  the 
  second. 
  The 
  other 
  two 
  are 
  supposed 
  to 
  be 
  premolars. 
  It 
  will 
  

   be 
  observed 
  that 
  in 
  these 
  teeth 
  the 
  enamel 
  surrounding 
  the 
  lakes 
  

   is 
  much 
  folded 
  on 
  the 
  adjacent 
  borders, 
  while 
  the 
  front 
  border 
  of 
  the 
  

   anterior 
  lake 
  and 
  the 
  hinder 
  border 
  of 
  the 
  posterior 
  are 
  deeply 
  

   notched. 
  The 
  post-protoconal 
  valley, 
  that 
  entering 
  the 
  tooth 
  on 
  

   the 
  inner 
  face, 
  behind 
  the 
  protocone, 
  lacks 
  much 
  of 
  reaching 
  outward 
  

   halfway 
  to 
  the 
  median 
  style 
  of 
  the 
  outer 
  face 
  of 
  the 
  tooth. 
  

  

  One 
  of 
  the 
  sLx 
  teeth 
  mentioned 
  is 
  represented 
  by 
  figure 
  5. 
  It 
  is 
  a 
  

   right 
  premolar, 
  either 
  the 
  third 
  or 
  the 
  fourth. 
  The 
  height 
  of 
  the 
  

   crown 
  is 
  62 
  mm., 
  the 
  length 
  28 
  mm., 
  the 
  width 
  24 
  mm. 
  This 
  prob- 
  

  

  