﻿AND 
  REPTILIA 
  OF 
  NORTH 
  AMERICA. 
  13 
  

  

  Vertebral 
  centra 
  and 
  arches 
  are 
  not 
  well 
  distinguished 
  in 
  two 
  individuals, 
  but 
  instead, 
  an 
  axial 
  mass 
  which 
  

   may 
  represent 
  chorda 
  dorsalis. 
  In 
  one, 
  three 
  diapophyses 
  are 
  distinctly 
  developed 
  at 
  the 
  sacral 
  region. 
  In 
  a 
  third 
  

   individual 
  -without 
  head 
  or 
  thoracic 
  region, 
  but 
  in 
  which 
  the 
  ribs 
  and 
  hind 
  limbs 
  are 
  similar, 
  as 
  well 
  as 
  the 
  general 
  

   propoitions, 
  the 
  vertebrse 
  are 
  distinctly 
  ossified 
  ; 
  but 
  its 
  reference 
  to 
  this 
  species 
  is 
  uncertain. 
  

  

  Remains 
  of 
  both 
  fore 
  and 
  hind 
  limbs 
  are 
  preserved. 
  They 
  are 
  rather 
  stout, 
  not 
  large, 
  and 
  with 
  short 
  pha- 
  

   langes. 
  The 
  number 
  of 
  these 
  is 
  not 
  distinguishable. 
  

  

  Measurements 
  of 
  Limbs. 
  M. 
  

  

  Length 
  femur, 
  No. 
  1 
  0.060 
  

  

  " 
  tibia 
  and 
  fibula, 
  No. 
  1, 
  I 
  .050 
  

  

  " 
  anterior 
  phalange, 
  No. 
  1, 
  obverse, 
  .0285 
  

  

  " 
  femur, 
  No. 
  2, 
  .060 
  

  

  " 
  tibia 
  and 
  fibula, 
  No. 
  2, 
  .070 
  

  

  " 
  femur, 
  No. 
  3, 
  .052 
  

  

  " 
  posterior 
  phalange, 
  .026 
  

  

  The 
  deficiency 
  of 
  length 
  of 
  the 
  tibia 
  in 
  No. 
  1, 
  is 
  probably 
  due 
  to 
  imperfection 
  of 
  the 
  specimen. 
  There 
  are 
  

   bones 
  of 
  the 
  fore 
  limbs 
  in 
  No. 
  2 
  which 
  are 
  not 
  determinable. 
  The 
  ribs 
  are 
  rather 
  long 
  and 
  rather 
  curved. 
  The 
  cau- 
  

   dal 
  extremity 
  is 
  not 
  complete, 
  but 
  was 
  evidently 
  well 
  developed. 
  

  

  M. 
  

  

  Length 
  from 
  head 
  to 
  femur, 
  0.0356 
  

  

  " 
  head, 
  .0154 
  

  

  Width 
  " 
  behind, 
  .0175 
  

  

  " 
  " 
  interorbital, 
  .0042 
  

  

  Length 
  of 
  orbit, 
  .0040 
  

  

  TUDITANUS 
  RADIATUS, 
  Cope, 
  Sp. 
  Nov. 
  

  

  Represented 
  by 
  crania 
  of 
  several 
  individuals, 
  one 
  of 
  which 
  is 
  nearly 
  perfect, 
  and 
  is 
  selected 
  for 
  description 
  ; 
  

   others 
  are 
  more 
  or 
  less 
  complete 
  ; 
  and 
  present 
  the 
  prominent 
  peculiarities 
  of 
  the 
  species. 
  

  

  The 
  marked 
  character 
  of 
  this 
  form 
  is 
  seen 
  in 
  the 
  very 
  anterior 
  position 
  of 
  the 
  orbits 
  and 
  contraction 
  of 
  the 
  

   muzzle. 
  The 
  orbits 
  are 
  large 
  and 
  separated 
  by 
  a 
  little 
  more 
  than 
  their 
  own 
  diameter 
  ; 
  the 
  posterior 
  border 
  is 
  in 
  

   front 
  of 
  a 
  line 
  measuring 
  the 
  anterior 
  third 
  of 
  the 
  length 
  to 
  the 
  supra-occipital 
  crest, 
  and 
  nearly 
  at 
  the 
  line 
  marking 
  

   the 
  fourth 
  of 
  the 
  length 
  to 
  the 
  quadrate 
  region. 
  The 
  posterior 
  outline 
  of 
  the 
  skull 
  is 
  deeply 
  concave, 
  the 
  quadrate 
  

   angle 
  projecting 
  beyond 
  the 
  occipital 
  condyles, 
  which 
  are 
  themselves 
  quite 
  prominent. 
  The 
  osseous 
  segments 
  com- 
  

   posing 
  the 
  cranium 
  are 
  from 
  the 
  orbital 
  region 
  posteriorly, 
  three 
  median, 
  and 
  four 
  lateral 
  on 
  each 
  side. 
  The 
  supra- 
  

   occipital 
  is 
  rather 
  small, 
  and 
  is 
  broader 
  than 
  long. 
  Its 
  posterior 
  border 
  is 
  straight, 
  as 
  are 
  the 
  short 
  lateral 
  margins. 
  

   The 
  anterior 
  suture 
  presents 
  an 
  obtuse 
  angle 
  forwards. 
  A 
  large 
  rhombic 
  plate 
  occupies 
  the 
  parietal 
  region, 
  which 
  

   is 
  probably 
  divided 
  longitudinally 
  by 
  a 
  suture, 
  and 
  represents 
  the 
  parietal 
  bones. 
  It 
  extends 
  narrowing, 
  nearly 
  to 
  

   the 
  orbits, 
  when 
  the 
  middle 
  line 
  is 
  occupied 
  by 
  the 
  much 
  smaller 
  frontal. 
  The 
  suture 
  between 
  the 
  two 
  is 
  obscure, 
  

   but 
  seems 
  to 
  form 
  an 
  emargination 
  of 
  the 
  parietals. 
  There 
  is 
  a 
  subtriangular 
  post-frontal 
  which 
  expands 
  posteriorly 
  

   and 
  is 
  succeeded 
  by 
  a 
  supra-temporal 
  which 
  narrows 
  and 
  becomes 
  acute 
  posteriorly, 
  being 
  wedged 
  between 
  the 
  

   parietal 
  and 
  what 
  may 
  be 
  an 
  anterior 
  production 
  of 
  the 
  plate 
  representing 
  the 
  epiotic. 
  A 
  very 
  large 
  jugal 
  plate 
  

   extends 
  from 
  the 
  orbits 
  two-thirds 
  the 
  distance 
  to 
  the 
  extremity 
  of 
  the 
  quadrate, 
  the 
  remaining 
  third 
  being 
  covered 
  

   by 
  a 
  quadrato-jugal. 
  After 
  the 
  jugal 
  the 
  epiotic 
  is 
  the 
  largest 
  of 
  the 
  cranial 
  shields 
  or 
  bones, 
  and 
  sends 
  a 
  prolonga- 
  

   tion 
  forwards 
  between 
  the 
  parietal 
  and 
  supra- 
  temporal, 
  as 
  well 
  as 
  on 
  the 
  outer 
  side 
  of 
  the 
  latter. 
  

  

  There 
  is 
  no 
  trace 
  of 
  mucous 
  canals. 
  The 
  sculpture 
  consists 
  of 
  strong 
  ridges 
  radiating 
  and 
  inosculating. 
  

   Radiation 
  is 
  more 
  uninterrupted 
  on 
  both 
  jugal, 
  supra-temporal 
  and 
  anterior 
  part 
  of 
  epiotic 
  ; 
  in 
  the 
  first, 
  they 
  origi- 
  

   nate 
  in 
  front 
  of 
  the 
  middle 
  exteriorly 
  ; 
  on 
  the 
  supra-temporal, 
  near 
  the 
  anterior 
  part. 
  The 
  inosculation 
  is 
  honey- 
  

   comb-like 
  on 
  the 
  pariet.il, 
  supra-occipital 
  and 
  posterior 
  parts 
  of 
  the 
  epiotic. 
  

  

  