﻿384 
  E. 
  L. 
  Troxell 
  — 
  An 
  Oligocene 
  Camel. 
  

  

  shows 
  that 
  the 
  nasal 
  extended 
  anteriorly 
  on 
  the 
  premaxillary 
  

   to 
  the 
  point 
  where 
  the 
  latter 
  dips 
  downward. 
  The 
  masseteric 
  

   fossa 
  occupies 
  the 
  middle 
  of 
  the 
  ascending 
  ramus 
  and 
  fades 
  

   out 
  below 
  at 
  the 
  level 
  of 
  the 
  molars. 
  

  

  The 
  teeth. 
  — 
  Although 
  the 
  size 
  of 
  the 
  upper 
  canine 
  teeth 
  in 
  

   these 
  early 
  camels 
  may 
  vary 
  with 
  sex, 
  it 
  is 
  important 
  to 
  note 
  

   that 
  they 
  are 
  very 
  small 
  ; 
  the 
  length 
  in 
  the 
  new 
  species 
  is 
  

   about 
  5 
  mm 
  . 
  The 
  anterior 
  and 
  posterior 
  edges 
  are 
  only 
  slightly 
  

   compressed, 
  so 
  that 
  the 
  diameters 
  are 
  about 
  equal 
  ; 
  they 
  are 
  

   slightly 
  recurved, 
  situated 
  3 
  mm 
  from 
  the 
  incisors, 
  7 
  to 
  9 
  mm 
  from 
  

   the 
  first 
  premolar, 
  and 
  the 
  premaxillary 
  suture 
  leads 
  directly 
  

   to 
  the 
  anterior 
  edge 
  of 
  the 
  tooth. 
  

  

  Cj, 
  the 
  canine 
  of 
  the 
  lower 
  jaw, 
  is 
  considerably 
  larger 
  than 
  

   that 
  above 
  ; 
  it 
  is 
  more 
  flattened, 
  being 
  oval 
  in 
  section 
  ; 
  the 
  

   edges 
  are 
  thin 
  and 
  it 
  is 
  also 
  recurved. 
  The 
  enamel 
  covers 
  

   only 
  about 
  two-thirds 
  of 
  the 
  length 
  of 
  the 
  crown. 
  Through 
  

   contact 
  with 
  the 
  third 
  upper 
  incisor 
  the 
  anterior 
  thin 
  edge 
  is 
  

   much 
  worn. 
  Though 
  set 
  at 
  an 
  angle 
  in 
  the 
  body 
  of 
  the 
  ramus, 
  

   the 
  canine 
  is 
  not 
  at 
  all 
  procumbent 
  in 
  the 
  sense 
  that 
  the 
  lower 
  

   incisors 
  are, 
  for 
  they 
  extend 
  forward 
  almost 
  parallel 
  to 
  each 
  

   other 
  and 
  to 
  the 
  lower 
  edge 
  of 
  the 
  ramus 
  at 
  that 
  point. 
  The 
  

   lower 
  incisors 
  are 
  semi-spatulate 
  with 
  a 
  diagonal 
  cutting 
  edge. 
  

   Because 
  the 
  upper 
  incisors 
  are 
  set 
  at 
  right 
  angles 
  to 
  them, 
  

   these 
  precumbent, 
  lower 
  teeth 
  are 
  worn 
  off 
  squarely 
  on 
  the 
  

   ends. 
  The 
  anterior 
  incisor 
  is 
  smallest 
  ; 
  the 
  third 
  is 
  largest. 
  

  

  Only 
  the 
  second 
  and 
  third 
  upper 
  incisors 
  are 
  known, 
  although 
  

   the 
  alveolus 
  of 
  I 
  1 
  is 
  present 
  and 
  the 
  premaxillary 
  seems 
  to 
  be 
  

   complete. 
  I 
  2 
  is 
  erect, 
  standing 
  almost 
  at 
  right 
  angles 
  to 
  the 
  

   line 
  of 
  the 
  premolars, 
  but 
  does 
  not 
  touch 
  I 
  3 
  . 
  It 
  is 
  fairly 
  long, 
  

   curved 
  backward, 
  circular 
  in 
  cross 
  section 
  and 
  is 
  worn 
  on 
  the 
  

   posterior 
  edge 
  from 
  contact 
  with 
  incisors 
  2 
  and 
  3 
  below. 
  The 
  

   alveolus 
  of 
  I 
  1 
  indicates 
  a 
  smaller 
  tooth 
  of 
  the 
  form 
  and 
  posture 
  

   of 
  P. 
  

  

  I 
  3 
  is 
  of 
  unusual 
  interest 
  because 
  it 
  is 
  canine 
  in 
  form. 
  It 
  is 
  

   regularly 
  recurved 
  ; 
  it 
  interlocks 
  with 
  and 
  passes 
  in 
  front 
  

   of 
  the 
  lower 
  canine. 
  This 
  third 
  incisor 
  is 
  set 
  solidly 
  in 
  the 
  

   very 
  heavy 
  premaxillary 
  and 
  is 
  a 
  tooth 
  of 
  considerable 
  strength. 
  

   Although 
  the 
  point 
  is 
  worn 
  it 
  is 
  still 
  10 
  mm 
  long; 
  the 
  enamel 
  

   covers 
  only 
  about 
  two-fifths 
  of 
  the 
  length. 
  The 
  palatal 
  portion 
  

   of 
  the 
  maxillary 
  extends 
  forward 
  to 
  a 
  point 
  even 
  with 
  the 
  

   posterior 
  part 
  of 
  I 
  3 
  . 
  

  

  Premolars. 
  — 
  The 
  first 
  premolar 
  is 
  a 
  thin, 
  low, 
  but 
  long 
  

   (antero-posteriorly) 
  tooth 
  ; 
  it 
  is 
  bounded 
  by 
  diastemas 
  fore 
  and 
  

   aft 
  which 
  vary 
  from 
  6 
  to 
  9 
  mm 
  on 
  the 
  right 
  or 
  left. 
  The 
  right 
  

   Y\ 
  7-5 
  mm 
  long, 
  is 
  located 
  2 
  mm 
  behind 
  the 
  one 
  on 
  the 
  other 
  side, 
  

   which 
  measures 
  but 
  6*5 
  mm 
  ; 
  both 
  are 
  simple, 
  compressed, 
  

   trenchant 
  and 
  elongated. 
  It 
  is 
  difficult 
  to 
  see 
  how 
  this 
  tooth, 
  

  

  