﻿574 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  VOL. 
  44. 
  

  

  ably 
  belongs 
  to 
  the 
  species 
  here 
  described 
  ; 
  although 
  the 
  length 
  of 
  the 
  

   grinding 
  surface 
  is 
  equal 
  to 
  some 
  teeth 
  that 
  are 
  referred 
  to 
  E. 
  fra^ 
  

   temus. 
  Still 
  another 
  of 
  the 
  six 
  teeth 
  is 
  doubtful 
  (fig. 
  10). 
  The 
  

   height 
  of 
  the 
  crown 
  is 
  37 
  mm., 
  the 
  length 
  25 
  mm., 
  the 
  width 
  27 
  mm. 
  

   This 
  may 
  be 
  a 
  third 
  or 
  fourth 
  premolar 
  of 
  E. 
  fratemus 
  which 
  has 
  a 
  

   short 
  grinding 
  surface, 
  because 
  the 
  tooth 
  was 
  worn 
  down 
  to 
  one-half 
  

   or 
  less 
  of 
  its 
  original 
  length. 
  

  

  In 
  the 
  American 
  Museum 
  of 
  Natural 
  History 
  are 
  several 
  horse 
  

   teeth 
  which 
  were 
  collected 
  some 
  years 
  ago 
  by 
  Prof. 
  F. 
  W. 
  Putnam, 
  

   on 
  the 
  Alifia 
  River, 
  near 
  its 
  entrance 
  into 
  Tampa 
  Bay. 
  One 
  is 
  here 
  

   figured 
  (fig. 
  11). 
  It 
  belonged 
  to 
  the 
  right 
  side 
  and 
  is 
  a 
  premolar, 
  the 
  

   anterior 
  outer 
  style 
  (paiastyle) 
  being 
  flattened 
  and 
  furnished 
  with 
  a 
  

   furrow. 
  It 
  is 
  worn 
  down 
  one-half 
  its 
  length, 
  the 
  height 
  of 
  the 
  crown 
  

   being 
  35 
  mm. 
  The 
  length 
  of 
  the 
  grinding 
  surface 
  is 
  24 
  mm., 
  the 
  

   width 
  24 
  mm., 
  the 
  protocone 
  12 
  mm. 
  The 
  enamel 
  of 
  the 
  lakes 
  is 
  

   pretty 
  strongly 
  folded. 
  This 
  tooth 
  is 
  to 
  be 
  referred 
  to 
  E. 
  leidyi. 
  

   Figure 
  12 
  is 
  likewise 
  from 
  Alifia 
  River, 
  but 
  is 
  a 
  considerably 
  larger 
  

   tooth 
  and 
  appears 
  to 
  approach 
  E. 
  fratemus. 
  This, 
  too, 
  is 
  a 
  well- 
  

   worn 
  tooth; 
  the 
  height 
  of 
  the 
  crown 
  being 
  40 
  mm. 
  The 
  length 
  of 
  

   the 
  grinding 
  face 
  is 
  30 
  mm., 
  the 
  width 
  27 
  mm., 
  the 
  protocone 
  14 
  mm. 
  

   It 
  belonged 
  on 
  the 
  right 
  side 
  and 
  seems 
  to 
  be 
  a 
  premolar. 
  

  

  Some 
  of 
  the 
  difficulties 
  under 
  which 
  the 
  student 
  of 
  fossil 
  horses 
  

   labors 
  are 
  here 
  illustrated. 
  It 
  may 
  be 
  perfectly 
  obvious 
  that 
  two 
  

   species 
  are 
  present 
  and 
  that 
  they 
  differed 
  in 
  size; 
  but 
  the 
  teeth 
  of 
  the 
  

   larger 
  individuals 
  of 
  the 
  smaller 
  species 
  may 
  equal 
  in 
  size 
  the 
  teeth 
  of 
  

   the 
  smaller 
  individuals 
  of 
  the 
  larger 
  species. 
  The 
  matter 
  is 
  likewise 
  

   complicated 
  by 
  the 
  fact 
  that 
  the 
  premolars 
  are 
  larger 
  than 
  the 
  molars 
  

   of 
  the 
  same 
  individual. 
  It 
  may 
  not 
  always 
  be 
  possible 
  to 
  identify 
  

   single 
  teeth; 
  but 
  that 
  the 
  species 
  that 
  possessed 
  such 
  teeth 
  as 
  those 
  

   of 
  figures 
  7 
  and 
  8 
  was 
  identical 
  with 
  that 
  furnishing 
  the 
  teeth 
  of 
  

   figures 
  1 
  and 
  2 
  the 
  writer 
  regards 
  as 
  very 
  improbable. 
  

  

  In 
  the 
  collection 
  from 
  Peace 
  Creek, 
  with 
  the 
  No. 
  4086 
  of 
  the 
  

   Wagner 
  Free 
  Institute, 
  are 
  six 
  lower 
  teeth 
  of 
  medium 
  size 
  which 
  the 
  

   writer 
  refers 
  to 
  E. 
  leidyi. 
  Two 
  of 
  these 
  are 
  little 
  worn 
  and 
  appear 
  to 
  

   have 
  belonged 
  to 
  the 
  same 
  individual; 
  one 
  on 
  the 
  left 
  side, 
  the 
  other 
  

   on 
  the 
  right 
  (fig. 
  14). 
  A 
  third 
  has 
  the 
  crown 
  more 
  worn 
  (fig. 
  13). 
  A 
  

   fourth, 
  the 
  last 
  left 
  molar, 
  seems 
  to 
  have 
  the 
  crown 
  worn 
  down 
  to 
  

   about 
  two-thirds 
  its 
  original 
  height. 
  

  

  The 
  following 
  are 
  the 
  dimensions 
  of 
  the 
  three 
  figured 
  : 
  

  

  Height 
  of 
  Length 
  of 
  Width 
  of 
  

   crown. 
  crown. 
  crown. 
  

  

  Tooth 
  of 
  fig. 
  14. 
  

   Tooth 
  of 
  fig. 
  13. 
  

   Tooth 
  of 
  fig. 
  15. 
  

  

  These 
  lower 
  teeth 
  are 
  remarkable 
  because 
  of 
  their 
  narrowness. 
  

  

  