﻿FEMUR 
  OF 
  NOTOTHERIUM 
  MITCHELLI, 
  395 
  

  

  In 
  the 
  fossil 
  femur 
  under 
  description 
  the 
  relative 
  breadth 
  of 
  the 
  

   postcondylar 
  fossa 
  (ib. 
  fig. 
  4, 
  u) 
  resembles 
  that 
  in 
  Phascolomys 
  # 
  ; 
  the 
  

   more 
  equal 
  prominence 
  of 
  the 
  lateral 
  boundaries 
  of 
  the 
  rotular 
  sur- 
  

   face 
  is 
  also 
  a 
  character 
  in 
  which 
  the 
  fossil 
  resembles 
  the 
  "Wombat 
  

   more 
  than 
  it 
  does 
  the 
  Kangaroo 
  or 
  the 
  Diprotodon, 
  in 
  which 
  the 
  

   greater 
  prominence 
  of 
  the 
  inner 
  boundary 
  is 
  extreme 
  f 
  , 
  and 
  the 
  

   antero-posterior 
  extent 
  of 
  the 
  inner 
  condyle, 
  including 
  that 
  boun- 
  

   dary, 
  is 
  relatively 
  much 
  greater 
  than 
  in 
  the 
  present 
  fossil. 
  

  

  This 
  femur, 
  however, 
  j>resents 
  the 
  following 
  diiferences 
  from 
  that 
  

   of 
  the 
  Wombats. 
  The 
  rotular 
  surface 
  (ib. 
  fig. 
  3, 
  q) 
  is 
  relatively 
  

   narrower 
  i, 
  and 
  the 
  outer 
  boundary 
  (ib. 
  ib. 
  r) 
  is 
  sharper 
  ; 
  the 
  popli- 
  

   teal 
  depression, 
  above 
  the 
  intercondylar 
  fossa, 
  u, 
  which 
  is 
  deep 
  and 
  

   extensive 
  in 
  Phascolomys, 
  is 
  hardly, 
  if 
  at 
  all, 
  defined 
  in 
  the 
  fossil. 
  

   Moreover 
  the 
  size 
  of 
  this 
  fossil 
  is 
  greater 
  than 
  that 
  of 
  the 
  femur 
  

   in 
  the 
  largest 
  known 
  extinct 
  Wombat, 
  in 
  the 
  degree 
  in 
  which 
  the 
  

   mandible 
  and 
  teeth 
  of 
  Nototherium 
  Mitchelli§ 
  surpass 
  those 
  of* 
  

   Phascolomys 
  gigcis 
  \\. 
  

  

  Upon 
  the 
  foregoing 
  comparisons 
  I 
  therefore 
  formed 
  the 
  conclusion 
  

   that 
  the 
  distal 
  portion 
  of 
  femur 
  here 
  described 
  belongs 
  to 
  a 
  species 
  

   of 
  Nototherium, 
  as 
  large, 
  if 
  it 
  be 
  not 
  the 
  same, 
  as 
  Nototherium 
  

   Mitchelli. 
  

  

  The 
  following 
  are 
  its 
  dimensions, 
  with 
  which 
  I 
  add, 
  for 
  compa- 
  

   rison, 
  those 
  of 
  the 
  corresponding 
  part 
  of 
  the 
  femur 
  of 
  a 
  mature 
  

   Diprotodon 
  austrdlis 
  : 
  — 
  

  

  Nototherium. 
  Diprotodon. 
  

  

  in. 
  lin. 
  in. 
  lin. 
  

  

  Length 
  8 
  6 
  13 
  6 
  

  

  Breadth 
  across 
  condyles 
  5 
  9 
  7 
  6 
  

  

  „ 
  , 
  transverse, 
  of 
  broken 
  end 
  of 
  shaft 
  3 
  1 
  4 
  5 
  

  

  „ 
  , 
  antero-posterior, 
  of 
  ditto 
  2 
  3 
  2 
  8 
  

  

  Circumference 
  of 
  ditto 
  8 
  4 
  12 
  

  

  „ 
  above 
  the 
  condyles 
  12 
  2 
  15 
  3 
  

  

  Breadth 
  of 
  rotular 
  joint 
  2 
  3 
  2 
  4 
  

  

  „ 
  of 
  intercondylar 
  fossa 
  1 
  5 
  1 
  7 
  

  

  The 
  present 
  portion 
  of 
  femur 
  is 
  of 
  a 
  mature 
  and 
  seemingly 
  aged 
  

   individual. 
  

  

  The 
  fractured 
  surface 
  of 
  the 
  femoral 
  shaft 
  (PI. 
  XVI. 
  fig. 
  2) 
  exposes 
  

   the 
  lower 
  end 
  of 
  the 
  medullary 
  cavity, 
  with 
  the 
  compact 
  wall 
  

   from 
  4 
  to 
  6 
  lines 
  in 
  thickness, 
  and 
  part 
  of 
  the 
  spongy 
  portion 
  of 
  the 
  

   wall, 
  the 
  extent 
  of 
  which 
  is 
  indeterminate 
  through 
  abrasion. 
  No 
  

   femur 
  referrible 
  to 
  the 
  genus 
  Nototherium 
  has 
  previously 
  come 
  under 
  

   my 
  ken. 
  

  

  This 
  fossil 
  is 
  from 
  a 
  locality 
  in 
  Darling 
  Downs, 
  Queensland, 
  

   Australia. 
  At 
  the 
  time 
  of 
  " 
  going 
  to 
  press 
  " 
  with 
  the 
  work 
  on 
  

  

  * 
  Ib. 
  pi. 
  ciii. 
  fig. 
  2. 
  I 
  lb. 
  pi. 
  xxxiii,, 
  s. 
  

  

  \ 
  Compare 
  with 
  fig. 
  4, 
  pi. 
  ciii., 
  op. 
  cit, 
  § 
  Op. 
  cit. 
  pi. 
  xlv. 
  

  

  j| 
  Ib. 
  pi. 
  lxv. 
  

  

  