﻿394 
  E. 
  L. 
  Troxell 
  — 
  A 
  Tiny 
  Oligocene 
  Artiodactyl. 
  

  

  greater 
  than 
  that 
  of 
  the 
  last 
  molar 
  tooth. 
  The 
  paramas- 
  

   toid 
  processes 
  are 
  closely 
  joined 
  to 
  the 
  bulla? 
  except 
  per- 
  

   haps 
  at 
  the 
  tips. 
  The 
  occipital 
  condyles 
  are 
  small 
  com- 
  

   pared 
  to 
  their 
  wide 
  separation 
  of 
  abont 
  9 
  mm. 
  The 
  

   region 
  above 
  the 
  occipital 
  condyles 
  is 
  very 
  full 
  and 
  

   heavy 
  and, 
  as 
  Matthew 
  states, 
  furnished 
  plenty 
  of 
  room 
  

   for 
  the 
  large 
  cerebellum. 
  

  

  Anteriorly 
  the 
  orbit 
  extends 
  well 
  out 
  over 
  M 
  1 
  (a 
  camel- 
  

   ine 
  character). 
  Its 
  antero-posterior 
  diameter 
  is 
  over 
  

   14 
  mm., 
  and 
  above, 
  the 
  border 
  curves 
  well 
  in 
  toward 
  the 
  

   median 
  line 
  of 
  the 
  skull 
  ; 
  at 
  this 
  point 
  the 
  frontal 
  is 
  not 
  

   more 
  than 
  7 
  mm. 
  in 
  width, 
  giving 
  an 
  upward 
  and 
  forward 
  

   direction 
  to 
  the 
  eyes. 
  The 
  muzzle, 
  which 
  is 
  lacking 
  in 
  

   the 
  present 
  specimen, 
  is 
  said 
  to 
  be 
  slender 
  , 
  with 
  no 
  in- 
  

   cisors 
  in 
  the 
  premaxillary, 
  but 
  with 
  a 
  long 
  post-canine 
  

  

  Fig. 
  2. 
  

  

  Fig. 
  2. 
  — 
  Palatal 
  view 
  of 
  skull 
  of 
  Hypisodus 
  alacer, 
  sp. 
  nov. 
  Holotype. 
  

   Cat. 
  No. 
  10033. 
  Natural 
  size. 
  

  

  diastema. 
  The 
  palate 
  forms 
  a 
  high 
  arch 
  and 
  the 
  molars 
  

   are 
  situated 
  apart 
  a 
  distance 
  equal 
  to 
  the 
  length 
  of 
  the 
  

   molar 
  series. 
  

  

  The 
  molar 
  teeth 
  are 
  long-crowned 
  or 
  hypsodont, 
  and 
  

   in 
  general 
  form 
  have 
  the 
  typical 
  selenodont 
  style 
  of 
  artio- 
  

   dactyl 
  tooth. 
  In 
  the 
  upper 
  molars 
  the 
  anterior 
  lobe 
  of 
  

   each 
  is 
  much 
  larger, 
  and 
  therefore, 
  because 
  the 
  inner 
  

   borders 
  are 
  aligned, 
  the 
  teeth 
  themselves 
  are 
  set 
  at 
  an 
  

   angle, 
  the 
  metastyle 
  (postero-exterior 
  corner) 
  rests 
  

   against 
  the 
  middle 
  of 
  the 
  tooth 
  behind, 
  while 
  the 
  para- 
  

   style 
  (anterior) 
  is 
  set 
  far 
  out 
  into 
  the 
  maxillary 
  bone 
  

   and 
  overlaps 
  the 
  preceding 
  tooth. 
  Only 
  in 
  M 
  3 
  does 
  the 
  

   metastyle 
  have 
  room 
  to 
  develop 
  a 
  sharp 
  fold, 
  and 
  thus 
  

   the 
  last 
  superior 
  molar 
  is 
  narrowed 
  behind, 
  forming 
  what 
  

   has 
  been 
  termed 
  a 
  " 
  small 
  heel 
  column.' 
  ' 
  A 
  strong 
  ex- 
  

   ternal 
  ridge 
  marks 
  the 
  position 
  of 
  the 
  paracone, 
  and 
  in 
  

  

  