﻿590 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  Table 
  of 
  ratios. 
  

  

  An 
  examination 
  of 
  this 
  table 
  appears 
  to 
  show 
  that 
  Equus 
  cahallus, 
  

   as 
  represented 
  by 
  the 
  two 
  specimens 
  used, 
  stands 
  out 
  as 
  a 
  horse 
  with 
  

   a 
  relatively 
  narrow 
  skull; 
  the 
  Arabian 
  horse 
  as 
  one 
  with 
  a 
  broad 
  

   skull; 
  Equus 
  niobrarensis 
  as 
  one 
  with 
  a 
  skull 
  wide, 
  especially 
  at 
  the 
  

   glenoid 
  fossae 
  and 
  the 
  orbits, 
  but 
  narrowing 
  at 
  the 
  front 
  of 
  the 
  jugals; 
  

   while 
  Equus 
  laurentius 
  has 
  a 
  broad 
  skull 
  and 
  a 
  rather 
  long 
  nose. 
  It 
  

   is 
  possible 
  that 
  in 
  the 
  case 
  of 
  E. 
  niobrarensis 
  the 
  width 
  of 
  the 
  orbits 
  

   has 
  been 
  somewhat 
  increased 
  by 
  distortion; 
  but 
  this 
  is 
  not 
  apparent 
  

   to 
  any 
  considerable 
  degree, 
  and 
  the 
  distortion 
  has 
  certainly 
  not 
  

   aflPected 
  the 
  region 
  across 
  the 
  glenoid 
  fossae. 
  The 
  Arabian 
  horse 
  which 
  

   is 
  mentioned 
  above 
  is 
  supposed 
  to 
  be 
  of 
  pure 
  blood. 
  The 
  skeleton 
  

   was 
  presented 
  to 
  the 
  United 
  States 
  National 
  Museum 
  by 
  the 
  cartoon- 
  

   ist 
  Mr. 
  Homer 
  Davenport. 
  It 
  will 
  be 
  observed 
  that 
  the 
  skull 
  is 
  

   relatively 
  broad, 
  but 
  the 
  face 
  is 
  not 
  found 
  to 
  be 
  particularly 
  short. 
  

   Shortness 
  of 
  face 
  is 
  given 
  by 
  Nehring* 
  as 
  the 
  character 
  of 
  Arabian 
  

   horses 
  which 
  distinguishes 
  them 
  from 
  the 
  large 
  breeds 
  of 
  western 
  

   Europe. 
  Nevertheless, 
  when 
  Nehring's 
  measurements 
  of 
  the 
  face 
  

   are 
  employed 
  to 
  determine 
  the 
  ratio 
  of 
  the 
  basilar 
  length 
  to 
  the 
  

   length 
  of 
  the 
  line 
  extending 
  from 
  the 
  front 
  of 
  the 
  premaxillae 
  to 
  the 
  

   middle 
  of 
  the 
  line 
  joining 
  the 
  rears 
  of 
  the 
  orbits, 
  there 
  is 
  found 
  to 
  be 
  

   little 
  or 
  no 
  difference 
  between 
  his 
  so-called 
  long-faced 
  horses 
  and 
  the 
  

   Arabs. 
  In 
  fact, 
  the 
  horse 
  recorded 
  by 
  him 
  as 
  having 
  the 
  longest 
  face, 
  

   his 
  number 
  51 
  , 
  has 
  the 
  f 
  acio-cephalic 
  index 
  only 
  72 
  ; 
  whereas, 
  his 
  num- 
  

   ber 
  31, 
  an 
  Arab, 
  has 
  a 
  f 
  acio-cephalic 
  index 
  of 
  75. 
  It 
  is 
  to 
  be 
  remem- 
  

   bered 
  that 
  Nehring's 
  index 
  for 
  the 
  length 
  of 
  the 
  face 
  is 
  obtained, 
  not 
  

   by 
  comparison 
  with 
  the 
  basilar 
  length, 
  but 
  with 
  the 
  distance 
  from 
  

   the 
  rear 
  of 
  the 
  orbit 
  to 
  the 
  middle 
  of 
  the 
  occipital 
  crest. 
  

  

  As 
  to 
  E. 
  laurentius, 
  the 
  type 
  shows 
  that 
  the 
  part 
  in 
  front 
  of 
  the 
  

   orbit 
  is 
  relatively 
  short; 
  while 
  the 
  occipital 
  crest 
  is 
  curved 
  somewhat 
  

   backward, 
  but 
  not 
  so 
  much 
  as 
  in 
  the 
  ass. 
  

  

  > 
  Landw. 
  Jahrb., 
  vol. 
  13, 
  p. 
  110. 
  

  

  