﻿E. 
  C. 
  Case 
  — 
  Stylemys 
  nebracensis. 
  437 
  

  

  The 
  first 
  dorsal 
  lay 
  almost 
  in 
  line 
  with 
  the 
  other 
  dorsals 
  

   and 
  the 
  anterior 
  zygapophyses 
  are 
  not 
  especially 
  large. 
  

  

  The 
  eighth 
  cervical 
  is 
  characteristically 
  short, 
  biconvex 
  

   with 
  the 
  anterior 
  face 
  of 
  the 
  centrum 
  double; 
  large 
  

   sharply 
  down-curved 
  posterior 
  zygapophyses 
  ; 
  no 
  neural 
  

   spine 
  ; 
  a 
  thin 
  keel 
  on 
  the 
  lower 
  surface. 
  It 
  stood 
  nearly 
  

   at 
  a 
  right 
  angle 
  to 
  the 
  first 
  dorsal 
  in 
  the 
  sharp 
  downward 
  

   curve 
  of 
  the 
  neck 
  characteristic 
  of 
  all 
  the 
  Testudinidae. 
  

  

  The 
  seventh 
  cervical 
  is 
  longer 
  than 
  the 
  eighth; 
  bicon- 
  

   cave 
  with 
  the 
  faces 
  of 
  the 
  centrum 
  double 
  ; 
  the 
  posterior 
  

   zygapophyses 
  relatively 
  longer 
  than 
  in 
  Gopherus; 
  the 
  

   anterior 
  zygapophyses 
  lost; 
  a 
  low, 
  thin 
  keel 
  runs 
  nearly 
  

   the 
  entire 
  length 
  of 
  the 
  lower 
  face 
  of 
  the 
  centrum. 
  

  

  The 
  sixth 
  cervical 
  has 
  a 
  double 
  convex 
  face 
  behind 
  and 
  

   a 
  single 
  concave 
  face 
  in 
  front; 
  the 
  articular 
  portion 
  of 
  

   the 
  convex 
  posterior 
  face 
  is 
  on 
  the 
  upper 
  part 
  of 
  the 
  face 
  

   and 
  there 
  is 
  a 
  broad 
  pit 
  on 
  the 
  lower 
  portion 
  permitting 
  

   of 
  over-extension 
  of 
  the 
  neck 
  as 
  it 
  was 
  straightened 
  ; 
  the 
  

   posterior 
  zygapophyses 
  are 
  lost; 
  the 
  anterior 
  zygapoph- 
  

   yses 
  rise 
  nearly 
  straight 
  upward 
  from 
  the 
  sides 
  of 
  the 
  

   centrum 
  so 
  that 
  the 
  fifth 
  and 
  sixth 
  cervicals 
  would 
  have 
  

   to 
  stand 
  at 
  a 
  considerable 
  angle 
  to 
  each 
  other 
  to 
  permit 
  

   articulation 
  of 
  the 
  zygapophyses. 
  This 
  last 
  character 
  is 
  

   more 
  pronounced 
  than 
  in 
  Gopherus 
  showing 
  that 
  the 
  neck 
  

   was 
  even 
  more 
  sharply 
  curved 
  at 
  the 
  posterior 
  end 
  than 
  

   in 
  that 
  genus. 
  

  

  The 
  fifth 
  cervical 
  is 
  similar 
  to 
  the 
  sixth 
  in 
  general 
  form. 
  

   The 
  posterior 
  face 
  is 
  single 
  convex 
  and 
  the 
  anterior 
  

   single 
  concave; 
  the 
  articular 
  portion 
  of 
  the 
  posterior 
  

   face 
  is 
  even 
  higher 
  than 
  in 
  the 
  sixth 
  and 
  the 
  pit 
  below 
  

   deeper 
  and 
  larger 
  ; 
  the 
  anterior 
  zygapophyses 
  are 
  a 
  little 
  

   more 
  inclined 
  forward. 
  

  

  The 
  fourth 
  cervical 
  is 
  represented 
  by 
  the 
  posterior 
  half 
  

   only, 
  the 
  posterior 
  face 
  is 
  single 
  convex. 
  

  

  In 
  all 
  the 
  characters 
  of 
  the 
  shell 
  the 
  pelvis 
  and 
  the 
  ver- 
  

   tebrae 
  recovered 
  there 
  is 
  a 
  strong 
  resemblance 
  to 
  the 
  liv- 
  

   ing 
  Testudinidae 
  and 
  show 
  that 
  Stylemys 
  was 
  a 
  typical 
  

   land 
  form. 
  

  

  Measurements 
  mm. 
  

  

  Length 
  of 
  the 
  carapace 
  600 
  

  

  Length 
  of 
  the 
  plastron 
  569 
  

  

  Height 
  as 
  mounted 
  262 
  

  

  Length 
  symphasis 
  of 
  pelvis 
  94 
  

  

  