﻿294 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  a 
  projecting 
  point 
  or 
  miicro; 
  neurals 
  variable 
  but 
  usually 
  less 
  dif- 
  

   ferentiated 
  than 
  in 
  most 
  species 
  of 
  the 
  genus; 
  first 
  neural 
  longest 
  

   of 
  the 
  series; 
  entoplastron 
  pointed 
  in 
  front, 
  rounded 
  behind; 
  gular 
  

   scutes 
  constantly 
  encroaching 
  on 
  the 
  entoplastron 
  ; 
  suprapygal 
  usually 
  

   in 
  contact 
  with 
  the 
  eleventh 
  peripheral 
  only, 
  rarely 
  reaching 
  the 
  

   pygal; 
  median 
  longitudinal 
  ridge 
  in 
  front 
  of 
  the 
  choanae. 
  

  

  Figure 
  20. 
  — 
  Skull 
  of 
  Testudo 
  praeextans 
  Lambe 
  (U.S.N.M. 
  No. 
  15874), 
  superior 
  view: 
  

   exoc, 
  exoccipital; 
  /, 
  frontal; 
  /, 
  jugal; 
  mx, 
  maxillary; 
  occ, 
  occipital 
  condyle; 
  op, 
  opisthotic; 
  

   p, 
  parietal; 
  pf, 
  prefrontal; 
  pmx, 
  premaxillary; 
  prf, 
  postfrontal; 
  so, 
  siipraoccipital; 
  sq, 
  

   squamosal. 
  Natural 
  size. 
  

  

  Materials. 
  — 
  ^The 
  four 
  specimens 
  pertaining 
  to 
  Testudo 
  praeextans 
  

   are 
  all 
  from 
  Niobrara 
  County, 
  Wyo., 
  and 
  from 
  the 
  Brule 
  division 
  of 
  the 
  

   Oligocene. 
  The 
  best-preserved 
  specimen, 
  U.S.N.M. 
  No, 
  15874, 
  col- 
  

   lected 
  in 
  1932, 
  consists 
  of 
  the 
  complete 
  carapace, 
  plastron, 
  skull, 
  

   lower 
  jaws, 
  pectoral 
  and 
  pelvic 
  girdles, 
  both 
  humeri, 
  both 
  ulnae, 
  one 
  

   radius, 
  both 
  femora, 
  both 
  tibiae, 
  one 
  fibula, 
  and 
  parts 
  of 
  all 
  four 
  feet. 
  

   It 
  was 
  found 
  on 
  the 
  Anderson 
  Ranch 
  on 
  the 
  south 
  side 
  of 
  Young 
  

   Woman 
  Creek; 
  specimen 
  U.S.N.M. 
  No. 
  15878, 
  collected 
  in 
  1932, 
  was 
  

   found 
  on 
  the 
  east 
  side 
  of 
  Little 
  Indian 
  Creek 
  and 
  consists 
  of 
  the 
  com- 
  

   plete 
  shell, 
  parts 
  of 
  both 
  humeri, 
  both 
  ulnae, 
  both 
  radii, 
  one 
  articulated 
  

   forefoot, 
  and 
  portions 
  of 
  the 
  other 
  three 
  forefeet; 
  specimen 
  U.S.N.M. 
  

  

  