﻿308 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  coracoid; 
  left 
  femur, 
  tibia, 
  fibula, 
  and 
  portion 
  of 
  hind 
  foot. 
  It 
  was 
  

   collected 
  by 
  C. 
  W. 
  Gilmore 
  on 
  the 
  Thomas 
  Ranch, 
  Niobrara 
  County, 
  

   Wyo., 
  in 
  1932. 
  Specimen 
  U.S.N.M. 
  No. 
  16731 
  consists 
  of 
  a 
  complete 
  

   carapace 
  and 
  plastron 
  (pi. 
  42). 
  It 
  was 
  collected 
  1 
  mile 
  northeast 
  of 
  

   Whitman 
  Postoffice, 
  Niobrara 
  County, 
  Wyo., 
  by 
  George 
  B. 
  Pearce 
  

   in 
  1942. 
  Both 
  of 
  these 
  specimens 
  are 
  from 
  the 
  Brule 
  division 
  of 
  the 
  

   Oligocene. 
  

  

  In 
  size 
  and 
  general 
  contour 
  of 
  the 
  shell 
  these 
  specimens 
  are 
  in 
  close 
  

   agreement 
  with 
  the 
  type, 
  as 
  shown 
  by 
  the 
  measurements 
  given 
  in 
  

   table 
  9. 
  

  

  Table 
  9. 
  

  

  -Comparative 
  measurements 
  {in 
  millimeters) 
  of 
  carapace 
  and 
  plastron 
  of 
  

   Testudo 
  laticunea 
  

  

  Measurement 
  

  

  Type 
  spec- 
  

   imen 
  

  

  U.S.N.M. 
  

   No. 
  15854 
  

  

  U.S.N.M. 
  

   No. 
  16731 
  

  

  Greatest 
  length 
  of 
  carapace 
  _■ 
  

  

  Greatest 
  width 
  of 
  carapace 
  

  

  Greatest 
  length 
  of 
  plastron 
  

  

  Gi-eatest 
  length 
  of 
  anterior 
  lobe 
  

  

  Greatest 
  width 
  of 
  anterior 
  lobe 
  

  

  Greatest 
  length 
  of 
  posterior 
  lobe 
  

  

  Greatest 
  width 
  of 
  posterior 
  lobe 
  

  

  Greatest 
  width 
  of 
  bridge 
  

  

  Greatest 
  width 
  of 
  anterior 
  lip 
  at 
  gUlar 
  notch. 
  

  

  408 
  

   356 
  

   440 
  

   132 
  

   200 
  

   120 
  

   200 
  

  

  87 
  

  

  436 
  

   332 
  

   440 
  

   132 
  

   202 
  

   110 
  

   193 
  

   200 
  

   90 
  

  

  435 
  

   340 
  

   443 
  

   137 
  

   203 
  

   110 
  

   196 
  

   197 
  

  

  Specimens 
  U.S.N.M. 
  Nos. 
  15854 
  and 
  16731 
  are 
  practically 
  free 
  from 
  

   distortion 
  and 
  thus 
  give 
  a 
  true 
  picture 
  of 
  the 
  normal 
  shell. 
  It 
  will 
  be 
  

   noted 
  in 
  the 
  table 
  of 
  measurements 
  that 
  the 
  Wyoming 
  carapaces 
  are 
  

   considerably 
  narrower 
  than 
  that 
  of 
  the 
  type. 
  This 
  difference 
  may 
  be 
  

   partly 
  due 
  to 
  the 
  crushing 
  to 
  which 
  the 
  type 
  has 
  been 
  subjected. 
  In 
  

   cross 
  section 
  at 
  midlength 
  the 
  shells 
  of 
  Nos. 
  15854 
  and 
  16731 
  are 
  evenly 
  

   rounded 
  from 
  side 
  to 
  side, 
  whereas 
  the 
  type 
  is 
  said 
  to 
  be 
  flattened 
  on 
  

   top. 
  All 
  three, 
  however, 
  can 
  be 
  classed 
  as 
  having 
  a 
  depressed 
  style 
  of 
  

   shell, 
  and 
  all 
  are 
  of 
  female 
  sex, 
  as 
  shown 
  by 
  the 
  flatness 
  of 
  their 
  plastra. 
  

  

  Other 
  minor 
  differences 
  observed 
  between 
  these 
  two 
  specimens 
  and 
  

   the 
  type 
  fall 
  well 
  within 
  the 
  variations 
  expected 
  in 
  individuals 
  of 
  a 
  

   single 
  species. 
  

  

  The 
  skeletal 
  parts 
  preserved 
  with 
  the 
  shell 
  of 
  U.S.N.M. 
  No. 
  15854 
  

   have 
  been 
  carefully 
  compared 
  with 
  the 
  homologous 
  bones 
  of 
  T. 
  

   praeextans 
  and 
  other 
  species 
  of 
  Testudo, 
  but 
  except 
  for 
  their 
  smaller 
  

   size 
  no 
  other 
  characters 
  for 
  distinguishing 
  between 
  them 
  were 
  dis- 
  

   covered. 
  

  

  Hay 
  ^ 
  has 
  pointed 
  out 
  in 
  his 
  study 
  of 
  the 
  type 
  of 
  T. 
  laticunea 
  that 
  the 
  

   "neurals 
  have 
  not 
  attained 
  so 
  liigh 
  a 
  degree 
  of 
  differentiation 
  as 
  they 
  

   have 
  in 
  most 
  species 
  of 
  the 
  genus." 
  Although 
  the 
  complete 
  neural 
  

   series 
  cannot 
  be 
  traced 
  out 
  in 
  either 
  specimen, 
  the 
  correctness 
  of 
  the 
  

  

  » 
  Hay, 
  O. 
  P., 
  Carnegie 
  Inst. 
  Washington 
  Publ. 
  75, 
  p. 
  403, 
  1908. 
  

  

  