﻿198 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  The 
  excellent 
  preservation 
  of 
  the 
  present 
  skeleton 
  offers 
  an 
  unusual 
  

   opportunity 
  for 
  recording 
  the 
  important 
  measurements 
  of 
  a 
  single 
  

   individual 
  of 
  an 
  Eocene 
  crocodile. 
  In 
  the 
  tables 
  that 
  follow 
  the 
  prin- 
  

   cipal 
  measurements 
  of 
  the 
  skeletal 
  parts 
  are 
  given, 
  following 
  Mook's 
  

  

  Table 
  1. 
  — 
  Comparative 
  measurements 
  {in 
  mm.) 
  of 
  skull, 
  pelvic, 
  and 
  limb 
  bones 
  in 
  

  

  two 
  species 
  of 
  Crocodilus 
  

  

  Measurements 
  

  

  Length 
  of 
  skull, 
  tip 
  of 
  snout 
  to 
  supraoccipital 
  

  

  Length 
  of 
  skull, 
  tip 
  of 
  snout 
  to 
  ends 
  of 
  quadrates 
  

  

  Breadth 
  of 
  skull, 
  cranial 
  table 
  

  

  Breadth 
  of 
  skull, 
  across 
  fifth 
  maxillary 
  tooth 
  

  

  Length 
  of 
  mandible 
  

  

  Lp,ngth 
  of 
  scapula, 
  total 
  -. 
  

  

  A 
  nteroposterior 
  diameter 
  of 
  superior 
  border 
  

  

  Anteroposterior 
  diameter 
  of 
  inferior 
  border 
  

  

  Maximum 
  thickness 
  of 
  distal 
  end 
  

  

  Length 
  of 
  coracoid, 
  total 
  --- 
  

  

  Anteroposterior 
  diameter, 
  superior 
  surface 
  

  

  Anteroposterior 
  diameter, 
  inferior 
  surface 
  

  

  Length 
  of 
  humerus, 
  total 
  ..- 
  

  

  Breadth 
  of 
  proximal 
  end 
  

  

  Breadth 
  of 
  distal 
  end 
  

  

  Circumference 
  of 
  shaft 
  - 
  

  

  Index 
  of 
  circumference 
  over 
  length 
  

  

  Length 
  of 
  radius, 
  totaL 
  -.. 
  

  

  Maximum 
  diameter, 
  proximal 
  end 
  

  

  Maximum 
  diameter, 
  distal 
  end 
  

  

  Length 
  of 
  ilium, 
  total 
  oblique 
  - 
  --- 
  -- 
  

  

  Length 
  of 
  ilium, 
  total 
  anteroposterior 
  

  

  Distance 
  across 
  both 
  ischiadic 
  processes 
  

  

  Maximum 
  length 
  of 
  ischium, 
  oblique 
  

  

  Anteroposterior 
  diameter, 
  proximal 
  end 
  .- 
  

  

  Maximum 
  diameter, 
  distal 
  end 
  

  

  Length 
  of 
  pubis, 
  total 
  _-_ 
  _. 
  

  

  Maximum 
  diameter, 
  proximal 
  end 
  

  

  Minimum 
  diameter, 
  proximal 
  end 
  

  

  Breadth 
  distal 
  end 
  

  

  Length 
  of 
  femur, 
  total 
  

  

  Breadth 
  , 
  proximal 
  end 
  

  

  Breadth, 
  distal 
  end 
  _ 
  

  

  Circumference 
  of 
  shaft 
  

  

  Distance 
  from 
  center 
  of 
  fourth 
  trochanter 
  to 
  proximal 
  end 
  

   Distance 
  from 
  center 
  of 
  fourth 
  trochanter 
  to 
  distal 
  end 
  

  

  T 
  J 
  i- 
  (Center 
  of 
  fourth 
  trochanter 
  to 
  proximal 
  end} 
  

  

  Index 
  ratio; 
  L- 
  

  

  l 
  Center 
  of 
  fourth 
  trochanter 
  to 
  distal 
  end 
  J 
  

  

  Length 
  of 
  tibia, 
  total 
  

  

  Maximum 
  diameter, 
  proximal 
  end- 
  __ 
  

  

  Maximum 
  diameter, 
  distal 
  end_ 
  

  

  Length 
  of 
  fibula, 
  total 
  _ 
  - 
  

  

  Maximum 
  diameter, 
  proximal 
  end 
  

  

  Maximum 
  diameter, 
  distal 
  end 
  

  

  Circumference 
  of 
  shaf 
  t_ 
  _._ 
  

  

  - 
  , 
  .. 
  I 
  Circumference 
  of 
  shaft] 
  

  

  Index 
  ratio; 
  >._ 
  

  

  I 
  Total 
  length 
  1 
  

  

  C. 
  clavis 
  

   (U.S.N.M. 
  

   No. 
  12719) 
  

  

  418 
  

   481 
  

   110 
  

   126 
  

   535 
  

   136 
  

  

  77.3 
  

  

  75.4 
  

  

  27 
  

   101 
  

  

  60.4 
  

  

  68.5 
  

   180 
  

  

  54 
  

  

  50.5 
  

  

  61 
  

   338 
  

   107 
  

  

  26 
  

  

  26.1 
  

   125.6 
  

   105 
  

   145 
  

   1.39 
  

  

  49 
  

  

  68 
  

  

  93.5 
  

  

  27 
  

  

  17.4 
  

  

  73.5 
  

   223 
  

  

  51.5 
  

  

  51.5 
  

  

  76 
  

  

  81 
  

   142 
  

  

  0.570 
  

  

  159 
  

  

  43.1 
  

  

  38 
  

   156 
  

  

  25 
  

  

  24 
  

  

  35 
  

  

  C. 
  americanus 
  

  

  (A.M.N.H. 
  

  

  No. 
  7139) 
  

  

  1 
  Possibly 
  an 
  error, 
  in 
  view 
  of 
  greater 
  proportions 
  of 
  most 
  of 
  the 
  other 
  measurements. 
  

  

  