﻿310 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  The 
  quadrate 
  form 
  of 
  this 
  beak 
  with 
  diverging 
  lateral 
  edges 
  is 
  more 
  

   like 
  that 
  of 
  T. 
  quadrata 
  Cope 
  than 
  of 
  any 
  other 
  species, 
  but 
  it 
  differs 
  

   in 
  having 
  the 
  gulohunieral 
  sidci 
  running 
  backward 
  and 
  inward 
  to 
  

   meet 
  on 
  the 
  median 
  line 
  instead 
  of 
  directly 
  across 
  this 
  bone 
  at 
  right 
  

   angles 
  to 
  the 
  midline, 
  as 
  in 
  the 
  type 
  of 
  the 
  species. 
  This 
  feature, 
  

   stressed 
  by 
  both 
  Cope 
  and 
  Hay, 
  is 
  so 
  at 
  variance 
  with 
  all 
  other 
  known 
  

   species 
  of 
  Testudo, 
  both 
  living 
  and 
  extinct, 
  that 
  it 
  leaves 
  one 
  wondering 
  

   if 
  it 
  is 
  not 
  an 
  abnormal 
  condition 
  peculiar 
  only 
  to 
  that 
  individual. 
  

  

  Specimen 
  No. 
  16737 
  is 
  larger 
  than 
  the 
  type, 
  as 
  shown 
  by 
  the 
  

   measurements 
  given 
  in 
  table 
  11. 
  

  

  With 
  the 
  possible 
  exception 
  of 
  length, 
  the 
  other 
  differences 
  observed 
  

   between 
  the 
  two 
  specimens 
  may 
  be 
  regarded 
  as 
  individual 
  variations. 
  

   The 
  beak 
  is 
  shorter 
  than 
  that 
  of 
  the 
  type 
  although 
  exceeding 
  it 
  in 
  all 
  

   other 
  dimensions. 
  Regardless 
  of 
  the 
  question 
  of 
  doubt 
  that 
  this 
  

   difference 
  may 
  engender 
  as 
  to 
  its 
  proper 
  specific 
  assignment, 
  this 
  

   fragmentary 
  specimen 
  certainly 
  indicates 
  the 
  presence 
  in 
  the 
  Brule 
  

   of 
  the 
  Hat 
  Creek 
  Basin 
  of 
  a 
  third 
  species 
  of 
  Testudo. 
  

  

  NOTE 
  ON 
  THE 
  GEOLOGICAL 
  DISTRIBUTION 
  OF 
  TESTUDO 
  

   IN 
  NORTH 
  AMERICA 
  

  

  In 
  the 
  "Fossil 
  Turtles 
  of 
  North 
  America," 
  p. 
  397, 
  1908, 
  Hay 
  lists 
  six 
  

   species 
  of 
  Oligocene 
  Testudo 
  as 
  occurring 
  in 
  the 
  Oreodon 
  beds 
  (Brule) 
  

   and 
  two 
  as 
  coming 
  from 
  the 
  Titanotherium 
  beds 
  (Chadron), 
  as 
  follows: 
  

  

  Brule 
  Chadron 
  

  

  Testudo 
  amphithorax 
  Cope 
  T. 
  brontops 
  Marsh 
  

  

  T. 
  ciiltrnta 
  Cope 
  T. 
  exornata 
  Lambe 
  

  

  T. 
  laticunea 
  Cope 
  

   T. 
  ligonia 
  Cope 
  

   T. 
  quadrata 
  Cope 
  

   T. 
  ihomsoni 
  Hay 
  

  

  In 
  a 
  subsequent 
  publication, 
  "Second 
  Bibliography 
  and 
  Catalogue 
  

   of 
  the 
  Fossil 
  Vertebrates 
  of 
  North 
  America," 
  Hay 
  assigned 
  all 
  the 
  

   Brule 
  species 
  to 
  the 
  Chadron. 
  One 
  is 
  at 
  a 
  loss 
  to 
  understand 
  whether 
  

   this 
  change 
  was 
  made 
  on 
  the 
  basis 
  of 
  new 
  information 
  or 
  whether 
  it 
  was 
  

   a 
  slip 
  of 
  the 
  pen. 
  

  

  In 
  view 
  of 
  the 
  recognition 
  of 
  two, 
  if 
  not 
  three, 
  of 
  the 
  species 
  in 
  im- 
  

   doubted 
  Brule 
  deposits, 
  it 
  would 
  appear 
  to 
  show 
  the 
  original 
  geologic 
  

   assignment 
  was 
  correct. 
  That 
  some 
  of 
  these 
  species 
  may 
  have 
  per- 
  

   sisted 
  from 
  the 
  Chadron 
  into 
  the 
  Brule 
  is 
  suggested 
  by 
  a 
  specimen 
  in 
  

   the 
  Yale 
  Aluseum 
  from 
  the 
  Titanotherium 
  beds, 
  which 
  Hay 
  '^ 
  identified 
  

   as 
  belonging 
  to 
  Testudo 
  laticunea. 
  That 
  such 
  was 
  the 
  case 
  needs 
  ad- 
  

   ditional 
  verification. 
  Tliis 
  assertion 
  is 
  made 
  on 
  the 
  fact 
  that 
  the 
  

   commonest 
  of 
  all 
  land 
  tortoises 
  of 
  the 
  Brule, 
  Stylemys 
  nebrascensis, 
  has 
  

   never 
  been 
  recognized 
  as 
  occurring 
  in 
  the 
  Chadron. 
  

  

  11 
  Hay, 
  O. 
  P., 
  Carnegie 
  Inst. 
  Washington 
  Publ. 
  75, 
  p. 
  404, 
  1908. 
  

  

  U. 
  S. 
  GOVERNMENT 
  PRINTING 
  OFFICE: 
  1946 
  

  

  