﻿74 
  THE 
  EXTINCT 
  BATKACHIA, 
  REPTILIA 
  

  

  Third 
  cervical 
  : 
  length 
  to 
  shoulder, 
  

  

  " 
  " 
  " 
  opposite 
  posterior 
  angle 
  parapophysis, 
  

  

  " 
  " 
  width 
  between 
  latter 
  points, 
  

  

  '' 
  " 
  least 
  width 
  behind 
  parapophyses, 
  

  

  " 
  vertical 
  diameter 
  cup, 
  

  

  ,: 
  transverse 
  diameter 
  cup, 
  above, 
  

  

  " 
  " 
  " 
  " 
  below, 
  

  

  Fourth 
  cervical 
  : 
  length 
  to 
  shoulder, 
  

  

  " 
  " 
  " 
  end 
  parapophysis, 
  

  

  Third 
  dorsal 
  : 
  length 
  to 
  shoulder 
  - 
  , 
  

  

  " 
  " 
  " 
  opposite 
  posterior 
  angle 
  parapophysis, 
  

  

  " 
  " 
  " 
  of 
  basis 
  of 
  hypapophysis, 
  

  

  " 
  " 
  width 
  between 
  ends 
  of 
  parapophyses, 
  

  

  " 
  " 
  li 
  of 
  neural 
  arch 
  just 
  behind 
  diapophyses, 
  

  

  " 
  " 
  " 
  of 
  anterior 
  cup, 
  

  

  " 
  " 
  " 
  of 
  neural 
  arch, 
  

  

  " 
  vertical 
  diameter 
  neural 
  arch, 
  

   " 
  " 
  cup, 
  

  

  Fifth 
  dorsal 
  : 
  length 
  to 
  shoulder, 
  

  

  " 
  " 
  " 
  basis 
  hypapophysis, 
  

  

  " 
  " 
  width 
  of 
  centrum 
  at 
  middle, 
  

  

  " 
  " 
  " 
  cup, 
  

  

  " 
  " 
  vertical 
  diameter 
  at 
  middle, 
  

   Lumbar 
  : 
  length 
  to 
  shoulder, 
  

   ' 
  ' 
  vertical 
  diameter 
  cup, 
  

  

  " 
  transverse,. 
  

  

  Portions 
  of 
  the 
  frontal 
  and 
  parietal 
  bones 
  of 
  a 
  gavial 
  are 
  figured 
  by 
  Leidy 
  (III., 
  fig. 
  8). 
  They 
  are 
  shown 
  under 
  

   the 
  head 
  of 
  H. 
  brevispinis 
  not 
  to 
  be 
  referable 
  tothe 
  cranium 
  of 
  that 
  species, 
  or 
  of 
  H. 
  tenebrosus 
  ; 
  whether 
  they 
  can 
  

   be 
  referred 
  to 
  H. 
  obscurus, 
  H. 
  cordatus, 
  or 
  H. 
  glyptodon 
  is 
  as 
  yet 
  uncertain. 
  

  

  This 
  species 
  is 
  no 
  doubt 
  a 
  gavial-like 
  animal, 
  very 
  near 
  the 
  T. 
  obscurus. 
  It 
  is 
  sufficiently 
  different 
  in 
  vertebral 
  

   structure 
  ; 
  probably 
  other 
  differences 
  will 
  be 
  found 
  where 
  other 
  bones 
  are 
  known. 
  

  

  HOLOPS 
  GLYPTODON, 
  Cope. 
  

   Thoracosaurus 
  glyptodon 
  Cope. 
  Geol. 
  Survey 
  of 
  New 
  Jersey, 
  Appendix 
  C. 
  

  

  This 
  species 
  is 
  indicated 
  by 
  a 
  few 
  teeth 
  only, 
  but 
  they 
  are 
  of 
  so 
  marked 
  a 
  character 
  as 
  to 
  render 
  their 
  recognition 
  

   and 
  arrangement 
  proper. 
  

  

  The 
  best 
  preserved 
  specimen 
  indicates 
  a 
  slender, 
  subcylindrical 
  strongly 
  curved 
  crown, 
  with 
  the 
  acute 
  ridge 
  

   which 
  divides 
  the 
  planes 
  extending 
  to 
  its 
  base. 
  There 
  are 
  probably 
  nine 
  obtuse 
  ridges 
  on 
  the 
  inner 
  or 
  concave 
  face, 
  

   each 
  about 
  as 
  wide 
  as 
  each 
  interval. 
  Both 
  ridges 
  and 
  grooves 
  are 
  covered 
  with 
  sharp 
  fine 
  longitudinal 
  striae, 
  which 
  

   are 
  continually 
  interrupted 
  and 
  irregular. 
  

  

  The 
  pulp 
  cavity, 
  as 
  on 
  others 
  of 
  the 
  genus, 
  is 
  rat 
  her 
  small. 
  Length 
  of 
  crown, 
  12 
  lines 
  ; 
  diameter 
  at 
  base, 
  4.5 
  1. 
  . 
  

   The 
  apex 
  is 
  slightly 
  compressed 
  and 
  smooth. 
  In 
  an 
  older 
  specimen 
  the 
  minute 
  striae 
  are 
  less 
  distinct, 
  leaving 
  the 
  

   fluting. 
  

  

  From 
  Barnesboro, 
  Gloucester 
  Co., 
  N. 
  J. 
  Not 
  found 
  with 
  or 
  near 
  any 
  of 
  the 
  preceding 
  specimens, 
  but 
  with 
  

   dermal 
  plates 
  not 
  distinguishable 
  from 
  those 
  of 
  H. 
  obscurus. 
  

  

  7/i. 
  

  

  Lin. 
  

  

  2 
  

  

  0.75 
  

  

  1 
  

  

  4.5 
  

  

  1 
  

  

  10.5 
  

  

  1 
  

  

  2. 
  

  

  1 
  

  

  5.25 
  

  

  1 
  

  

  5.25 
  

  

  

  11. 
  

  

  2 
  

  

  

  1 
  

  

  2.25 
  

  

  

  23. 
  

  

  

  10.5 
  

  

  

  14.25 
  

  

  

  33.75 
  

  

  

  2G. 
  

  

  

  22.5 
  

  

  

  5.25 
  

  

  

  7.5 
  

  

  

  19. 
  

  

  

  21. 
  

  

  

  14. 
  

  

  

  12.25 
  

  

  

  21.25 
  

  

  

  18. 
  

  

  

  25.5 
  

  

  

  20. 
  

  

  

  19. 
  

  

  