﻿AND 
  AYES 
  OF 
  NORTH 
  AMERICA. 
  37 
  

  

  on 
  the 
  hinder 
  aspect 
  of 
  a 
  dorsal 
  has 
  a 
  disciform 
  articular 
  surface 
  directed 
  outwards 
  and 
  downwards 
  : 
  the 
  prominence 
  

   of 
  its 
  upper 
  face 
  is 
  continuous 
  with 
  the 
  lateral 
  ridge 
  of 
  the 
  neural 
  spine. 
  The 
  anterior 
  uplooking 
  surface 
  is 
  equally 
  

   small 
  and 
  little 
  divergent. 
  

  

  Inches. 
  

  

  Vertical 
  diameter 
  centrum 
  dorsal, 
  3.42 
  

  

  Transverse 
  " 
  " 
  _ 
  " 
  2.7 
  

  

  Antero-posterior 
  diameter 
  centrum 
  dorsal, 
  (below,) 
  1.85 
  

  

  Vertical 
  diameter 
  centrum 
  dorsal, 
  (poster,) 
  2.98 
  

  

  Transverse 
  " 
  " 
  " 
  2.9 
  

  

  " 
  " 
  neural 
  canal, 
  .86 
  

  

  Longitudinal 
  diameter 
  base 
  neural 
  spine, 
  1.22 
  

  

  " 
  " 
  " 
  diapophysis 
  1.2 
  

  

  Length 
  between 
  extremities 
  zygapophyses, 
  (dorsal,) 
  2.26 
  

  

  Depth 
  of 
  cup 
  of 
  vertebrae, 
  .63 
  

  

  Length 
  centrum 
  anterior 
  caudal, 
  1 
  .73 
  

  

  Distance 
  between 
  bases 
  chevron 
  bone, 
  (caudal. 
  ) 
  2.58 
  

  

  Length 
  two 
  coossifled 
  caudals, 
  2.5 
  

  

  Width 
  anterior 
  in 
  front, 
  1.7 
  

  

  Depth 
  " 
  .9 
  

  

  It 
  may 
  be 
  observed 
  the 
  anterior 
  caudals 
  have 
  a 
  nearly 
  round 
  articular 
  extremity 
  ; 
  one 
  of 
  them 
  is 
  a 
  little 
  wider 
  

   than 
  high, 
  but 
  they 
  are 
  too 
  much 
  distorted 
  to 
  furnish 
  reliable 
  measurements. 
  

  

  The 
  portion 
  of 
  ilium 
  preserved 
  is 
  an 
  extremity. 
  It 
  is 
  flat 
  on 
  one 
  side 
  and 
  convex 
  on 
  the 
  other. 
  The 
  shaft 
  is 
  

   solid. 
  The 
  articular 
  extremity 
  is 
  oblique, 
  and 
  presents 
  a 
  truncate 
  extremity, 
  which 
  is 
  at 
  right 
  angles 
  to 
  a 
  short 
  

   recurved 
  margin, 
  which 
  has 
  been 
  an 
  insertion 
  or 
  articulation 
  ; 
  the 
  flat 
  surface 
  is 
  rugose 
  distally. 
  Long 
  diameter 
  of 
  

   extremity, 
  2 
  in. 
  .75 
  ; 
  of 
  shaft, 
  19 
  in. 
  The 
  articular 
  faces 
  of 
  the 
  extremity 
  of 
  the 
  femur 
  are 
  at 
  an 
  open 
  angle 
  with 
  

   each 
  other, 
  and 
  are 
  strongly 
  concave 
  in 
  transverse 
  section. 
  The 
  femur 
  is 
  here 
  very 
  flat, 
  with 
  narrow 
  margins 
  ; 
  it 
  

   becomes 
  stouter 
  with 
  diminishing 
  width. 
  Distally 
  the 
  surface 
  is 
  marked 
  by 
  grooves 
  and 
  small 
  foramina. 
  What 
  may 
  

   be 
  tibia 
  is 
  the 
  basal 
  frustrum 
  of 
  a 
  wedge 
  ; 
  the 
  articular 
  faces 
  broad, 
  the 
  outer 
  margin 
  narrowed 
  ; 
  the 
  faces 
  slightly 
  

   concave. 
  The 
  inner 
  margin 
  is 
  shorter 
  than 
  the 
  outer, 
  and 
  the 
  distal 
  part 
  of 
  it 
  presents 
  a 
  broad 
  articular 
  face. 
  Some 
  

   of 
  the 
  tarsal 
  bones 
  have 
  been 
  already 
  described. 
  There 
  are 
  thirteen 
  metatarsals 
  and 
  phalanges. 
  They 
  are 
  of 
  stout 
  

   proportions 
  and 
  are 
  considerably 
  constricted 
  medially. 
  Those 
  of 
  one 
  series 
  are 
  square 
  in 
  section 
  ; 
  those 
  of 
  another, 
  

   transverse; 
  those 
  of 
  the 
  third 
  transverse 
  with 
  one 
  edge 
  thinned 
  or 
  acuminate 
  in 
  section. 
  Some 
  of 
  each 
  form 
  are 
  

   more 
  elongate 
  than 
  others. 
  

  

  Inches. 
  

  

  Width 
  femur 
  at 
  extremity, 
  (restored,) 
  8. 
  

  

  Depth 
  " 
  " 
  (median,) 
  1.3 
  

  

  Width 
  " 
  four 
  inches 
  from 
  extremity, 
  6. 
  

  

  Thickness 
  femur 
  " 
  " 
  " 
  1.95 
  

  

  Width 
  tibia, 
  3.88 
  

  

  Length 
  externally, 
  2.6 
  

  

  Width 
  tarsi 
  tibiale, 
  2.48 
  

  

  Thickness 
  " 
  " 
  1.52 
  

  

  Length 
  parallelopiped 
  phalange, 
  1-56 
  

  

  Width 
  " 
  " 
  1.2 
  

  

  Thickness 
  " 
  1.2 
  

  

  " 
  depressed 
  " 
  1. 
  

  

  Width 
  u 
  a 
  1.4 
  

  

  Length 
  " 
  " 
  1-9 
  

  

  AMEEI. 
  PHILOSO. 
  SOC. 
  — 
  VOL. 
  XIV. 
  10 
  

  

  