﻿76 
  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  It 
  is 
  in 
  the 
  third 
  a 
  short 
  acute 
  transverse 
  crest 
  truncate 
  in 
  front, 
  gradually 
  inclined 
  behind 
  ; 
  fourth, 
  a 
  similar 
  crest 
  

   curved 
  into 
  a 
  crescent 
  quite 
  as 
  in 
  Leidy's 
  plate* 
  above 
  cited 
  under 
  T. 
  obscurus. 
  In 
  the 
  fifth 
  they 
  are 
  two 
  weak 
  

   elevations, 
  much 
  less 
  marked 
  than 
  in 
  the 
  above 
  in 
  my 
  possession. 
  All 
  the 
  above 
  exhibit 
  a 
  well 
  marked 
  constriction 
  

   between 
  the 
  parapophyses 
  and 
  the 
  rim 
  of 
  the 
  cup. 
  The 
  dorsals 
  with 
  hypapophyses 
  are 
  distinguished 
  by 
  the 
  less 
  

   cordate 
  form 
  of 
  the 
  articular 
  cups, 
  they 
  being 
  relatively 
  broader 
  below, 
  and 
  in 
  the 
  second 
  to 
  fifth, 
  narrower 
  above 
  

   than 
  in 
  the 
  T. 
  cordatus. 
  Their 
  neural 
  arches 
  have 
  on 
  the 
  inner 
  faces 
  a 
  ridge 
  constricting 
  the 
  neural 
  canal 
  slightly. 
  

   The 
  hypapophysis 
  of 
  the 
  two-fifths 
  in 
  my 
  possession 
  are 
  rather 
  short, 
  broad 
  and 
  obtuse. 
  

  

  The 
  cervicals 
  may 
  also 
  be 
  known 
  by 
  their 
  strong 
  posterior 
  shoulder, 
  and 
  constriction 
  of 
  the 
  body 
  behind 
  the 
  para 
  

   pophyses, 
  where 
  the 
  width 
  enters 
  the 
  length 
  (exclusive 
  of 
  ball) 
  twice 
  : 
  the 
  relation 
  is 
  1:1.5 
  in 
  T. 
  neocaesariensis. 
  

   The 
  parapophyses 
  are 
  most 
  abruptly 
  turned 
  out, 
  and 
  are 
  directed 
  downwards, 
  thus 
  embracing 
  a 
  median 
  concavity 
  

   which 
  is 
  divided 
  by 
  a 
  rather 
  narrow 
  carina. 
  Separated 
  from 
  the 
  rim 
  of 
  the 
  cup 
  by 
  a 
  narrow 
  transverse 
  plane, 
  a 
  hypa- 
  

   pophysial 
  elevation 
  extends 
  transversely 
  between 
  positions 
  in 
  front 
  of 
  the 
  parapophyses: 
  this 
  is 
  less 
  elevated 
  medially 
  

   than 
  exteriorly, 
  the 
  latter 
  position 
  being 
  marked 
  by 
  a 
  prominent 
  angle. 
  

  

  The 
  articular 
  cup 
  of 
  the 
  first 
  dorsal 
  is 
  a 
  slightly 
  transverse 
  oval. 
  The 
  lumbar 
  vertebra? 
  exhibit 
  little 
  to 
  distinguish 
  

   them 
  from 
  those 
  of 
  other 
  species. 
  An 
  anterior 
  caudal 
  is 
  more 
  depressed 
  than 
  that 
  from 
  near 
  the 
  same 
  position 
  

   in 
  T. 
  brevispinis. 
  The 
  cup 
  is 
  broader 
  than 
  high, 
  and 
  the 
  inferior 
  plane 
  broad 
  and 
  concave. 
  

  

  Measurements. 
  

  

  Fifth 
  cervical 
  ; 
  total 
  length, 
  

  

  length 
  to 
  shoulder, 
  

  

  width 
  of 
  neural 
  canal, 
  

  

  '• 
  between 
  ends 
  diapophyses, 
  

  

  " 
  " 
  " 
  parapophyses, 
  

  

  lateral 
  depth 
  of 
  body 
  in 
  front, 
  

  

  median 
  " 
  " 
  " 
  

  

  depth 
  articular 
  cup, 
  

   u 
  a 
  n 
  

  

  Seventh 
  dorsal 
  ; 
  total 
  length, 
  

  

  length 
  to 
  shoulder, 
  

   width 
  neural 
  canal, 
  

   depth 
  anteriorly, 
  with 
  hypapophysis, 
  

   width 
  of 
  cup, 
  

   depth 
  " 
  

   Posterior 
  dorsal 
  ; 
  length 
  to 
  shoulder, 
  

  

  vertical 
  diameter 
  cup, 
  

   transverse 
  " 
  " 
  

  

  The 
  mandible 
  preserved, 
  indicates 
  an 
  animal 
  of 
  considerable 
  size. 
  Estimated 
  according 
  to 
  the 
  proportions 
  of 
  

   existing 
  Gavials 
  its 
  length 
  would 
  have 
  been 
  : 
  — 
  

  

  In. 
  

   Head, 
  28.70 
  

  

  Body, 
  92.85 
  

  

  Tail, 
  69.64 
  

  

  ft. 
  

  

  Lin. 
  

  

  2 
  

  

  9. 
  

  

  2 
  

  

  1.5 
  

  

  

  9. 
  

  

  2 
  

  

  8.5 
  

  

  1 
  

  

  9.5 
  

  

  1 
  

  

  9. 
  

  

  1 
  

  

  8. 
  

  

  1 
  

  

  4. 
  

  

  1 
  

  

  4.75 
  

  

  2 
  

  

  7. 
  

  

  1 
  

  

  10.5 
  

  

  

  6.25 
  

  

  1 
  

  

  11.5 
  

  

  1 
  

  

  6.75 
  

  

  1 
  

  

  6-25 
  

  

  

  24.25 
  

  

  

  20.75 
  

  

  

  19. 
  

  

  Total, 
  Ft., 
  15 
  ; 
  In., 
  11.19 
  

  

  In. 
  I. 
  in. 
  

   Length 
  of 
  mandible 
  preserved, 
  13. 
  

  

  " 
  symphysis, 
  11.5 
  

  

  " 
  splenial 
  in 
  front 
  of 
  fork, 
  4.6 
  

  

  ♦II, 
  flg.4. 
  

  

  