﻿AND 
  AYES 
  OF 
  NORTH 
  AMERICA. 
  

  

  139 
  

  

  vertebral, 
  as 
  in 
  Chelone. 
  This 
  occurs 
  in 
  Osteopygis. 
  The 
  anterior 
  connection 
  between 
  

   the 
  carapacial 
  disc 
  and 
  margin 
  is 
  more 
  as 
  in 
  Osteopygis. 
  The 
  first 
  marginal 
  has 
  a 
  weak 
  

   connection 
  with 
  the 
  disc, 
  but 
  is 
  almost 
  free 
  posteriorly 
  ; 
  the 
  edge 
  of 
  the 
  second 
  marginal 
  

   is 
  broken, 
  but 
  I 
  have 
  doubts 
  whether 
  it 
  was 
  attached 
  as 
  in 
  the 
  known 
  species 
  of 
  Osteo- 
  

   pygis 
  by 
  the 
  margin 
  ; 
  it 
  was 
  supported 
  by 
  a 
  strong 
  rib 
  as 
  in 
  that 
  genus, 
  a 
  point 
  in 
  which 
  

   both 
  differ 
  from 
  Chelone. 
  

  

  Fijr. 
  39. 
  

  

  Carapace 
  of 
  Propleuea 
  Sopite, 
  restored. 
  

  

  The 
  femur 
  has 
  the 
  slender 
  shank 
  of 
  Osteopygis 
  ; 
  the 
  humerus 
  is 
  broad 
  and 
  stout. 
  

  

  I. 
  Margins 
  of 
  posterior 
  marginals 
  regular 
  or 
  convex. 
  

  

  Upper 
  and 
  lower 
  inner 
  margins 
  of 
  8th 
  marginal 
  bone 
  equal, 
  with 
  cylindric 
  fossa, 
  

   width 
  I 
  the 
  length 
  — 
  that 
  is 
  much 
  longer 
  than 
  in 
  the 
  O. 
  platylomus 
  : 
  vertebral 
  scuta 
  elon- 
  

   gate, 
  little 
  dilated 
  at 
  lateral 
  angles 
  ; 
  width 
  5th 
  marginal 
  bone 
  little 
  over 
  .6 
  the 
  length. 
  

  

  SOPITA. 
  

  

  