﻿122-H 
  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  sion. 
  Therefore 
  the 
  inner 
  face 
  is 
  the 
  most 
  extensive, 
  and 
  the 
  posterior 
  the 
  least 
  so. 
  It 
  differs 
  from 
  the 
  same 
  part 
  in 
  

  

  H. 
  fonlkei, 
  in 
  its 
  less 
  angularity, 
  especially 
  in 
  the 
  more 
  rounded, 
  and 
  less 
  defined 
  posterior 
  face. 
  The 
  internal 
  face 
  

  

  narrows 
  downwards, 
  and 
  while 
  the 
  greatest 
  diameter 
  of 
  the 
  fragment 
  above 
  is 
  antero-posterior. 
  below 
  it 
  is 
  diagonal, 
  

  

  the 
  anterior 
  point 
  being 
  the 
  inner. 
  

  

  Measurements. 
  Lines. 
  

  

  Antero-posterior 
  diameter 
  above, 
  48 
  

  

  Transverse 
  " 
  " 
  22.5 
  

  

  " 
  " 
  medullary 
  cavity, 
  20.5 
  

  

  The 
  portion 
  of 
  fibula 
  is 
  the 
  distal, 
  and 
  resembles 
  that 
  of 
  Hadrosaurus 
  foulkei, 
  in 
  being 
  slightly 
  expanded 
  near 
  

   the 
  extremity, 
  and 
  cylindric 
  in 
  the 
  lower 
  part 
  of 
  the 
  shaft. 
  In 
  both 
  genera 
  and 
  Oinithotarsus, 
  Cope, 
  the 
  distal 
  ex- 
  

   tremity 
  of 
  the 
  fibula 
  is 
  less 
  attenuated 
  than 
  in 
  Iguanodou. 
  

  

  Lines. 
  

   Transverse 
  distal 
  diameter, 
  40.5 
  

  

  do. 
  five 
  inches 
  above, 
  30 
  

  

  The 
  right 
  internal 
  metatarsus 
  also 
  bears 
  considerable 
  resemblance 
  to 
  that 
  of 
  H. 
  foulkei. 
  Its 
  proximal 
  extremity 
  

   is 
  much 
  more 
  convex 
  in 
  its 
  inner 
  outline 
  than 
  in 
  that 
  species. 
  The 
  inner 
  proximal 
  face 
  is 
  plane 
  and 
  longitudinally 
  

   wrinkled. 
  The 
  proximal 
  or 
  tarsal 
  articular 
  face 
  is 
  concave 
  anteriorly; 
  its 
  plane 
  is 
  at 
  right 
  angles 
  to 
  the 
  axis 
  of 
  the 
  

   shaft 
  of 
  the 
  bone. 
  It 
  is 
  strongly 
  oblique 
  in 
  Hadrosaurus 
  foulkei, 
  and 
  a 
  rib-like 
  prominence 
  of 
  the 
  outer 
  face 
  crosses 
  

   the 
  latter 
  obliquely 
  and 
  at 
  right 
  angles 
  to 
  the 
  proximal 
  extremity. 
  No 
  such 
  rib 
  exists 
  in 
  the 
  present 
  case, 
  because 
  

   the 
  weight 
  was 
  supported 
  by 
  the 
  shaft 
  of 
  the 
  bone, 
  directly 
  and 
  not 
  obliquely 
  as 
  in 
  Hadrosaurus. 
  Thus 
  the 
  Hypsi- 
  

   bemae 
  walked 
  more 
  exactly 
  on 
  the 
  toes 
  than 
  did 
  the 
  Hadrosauri. 
  

  

  The 
  posterior 
  margin 
  is 
  thinner, 
  and 
  as 
  in 
  H. 
  foulkei, 
  presents 
  a 
  rather 
  small 
  median 
  protuberance. 
  The 
  distal 
  

   condyle 
  is 
  broken 
  away, 
  but 
  the 
  twist 
  of 
  the 
  distal 
  portion 
  of 
  the 
  shaft 
  shows 
  that 
  it 
  was 
  directed 
  away 
  from 
  the 
  ad- 
  

   joining 
  metatarsal, 
  posteriorly.- 
  

  

  Measurements. 
  In. 
  Lin. 
  

  

  Length 
  from 
  antero-superior 
  to 
  postero-inferior 
  extremity 
  (inferior 
  articular 
  face 
  

  

  worn 
  away), 
  

   Transverse 
  diameter 
  proximally. 
  

  

  " 
  " 
  medially, 
  

  

  Antero-posterior 
  do. 
  do., 
  

   The 
  diameters 
  of 
  the 
  shaft 
  are 
  somewhat 
  larger 
  than 
  in 
  the 
  H. 
  foulkei 
  given 
  by 
  Leidy. 
  

  

  The 
  caudal 
  vertebra 
  is 
  of 
  large 
  size 
  and 
  peculiar 
  form. 
  The 
  centrum 
  is 
  considerably 
  wider 
  than 
  deep, 
  and 
  consider- 
  

   ably 
  longer 
  than 
  wide. 
  The 
  posterior 
  chevron 
  articulations 
  are 
  small, 
  and 
  each 
  is 
  connected 
  with 
  each 
  anterior 
  by 
  a 
  

   strong 
  rounded 
  angulation. 
  Between 
  the 
  latter 
  the 
  space 
  is 
  wide 
  and 
  slightly 
  concave 
  in 
  transverse 
  section, 
  least 
  so 
  me- 
  

   dially. 
  A 
  marked 
  peculiarity 
  is 
  seen 
  in 
  the 
  strong 
  longitudinal 
  ridge 
  which 
  divides 
  the 
  lateral 
  surface 
  of 
  the 
  vertebra 
  

   into 
  two 
  nearly 
  equal 
  faces. 
  The 
  neural 
  arch 
  is 
  elongate, 
  the 
  neural 
  canal 
  small, 
  in 
  section 
  a 
  short 
  vertical 
  ellipse. 
  The 
  

   articular 
  face 
  of 
  the 
  zygaphophyses 
  makes 
  an 
  angle 
  of 
  about 
  thirty-five 
  degrees 
  to 
  the 
  perpendicular. 
  The 
  crest 
  of 
  the 
  

   arch 
  rises 
  a 
  half 
  inch 
  behind 
  these 
  into 
  the 
  very 
  stout 
  basis 
  of 
  the 
  neural 
  spine, 
  the 
  greater 
  part 
  of 
  which, 
  with 
  the 
  

   posterior 
  zygapophyses, 
  is 
  broken 
  off. 
  The 
  inclination 
  of 
  the 
  base 
  is 
  at 
  about 
  65° 
  to 
  the 
  vertical 
  diameter 
  of 
  the 
  bone. 
  

   The 
  articular 
  laces 
  are 
  both 
  slightly 
  concave, 
  as 
  are 
  the 
  lateral 
  faces 
  which 
  arc 
  separated 
  by 
  the 
  lateral 
  ridge. 
  

  

  Length 
  of 
  centrum, 
  

  

  " 
  " 
  basis 
  neural 
  arch, 
  

   Width 
  posterior 
  articular 
  face, 
  

   Depth 
  do. 
  medially, 
  

   " 
  laterally. 
  

   " 
  basis 
  neural 
  spine. 
  

  

  Transverse 
  diameter 
  neural 
  canal 
  behind, 
  

   Width 
  between 
  latero-inferior 
  ridges. 
  

   " 
  vertical, 
  of 
  face 
  of 
  zygapophyses, 
  

   There 
  is 
  a 
  slight 
  rugose 
  protuberance 
  in 
  the 
  position 
  of 
  the 
  diapophysi's. 
  

  

  10 
  

  

  10 
  

  

  3 
  

  

  

  2 
  

  

  3.5 
  

  

  3 
  

  

  6 
  

  

  r 
  n. 
  

  

  Lin. 
  

  

  4 
  

  

  6 
  

  

  2 
  

  

  9 
  

  

  4 
  

  

  

  

  

  8 
  

  

  3 
  

  

  3 
  

  

  

  12 
  

  

  

  10 
  

  

  1 
  

  

  9 
  

  

  

  11 
  

  

  