﻿CANYON 
  FERRY 
  FOSSIL 
  VERTEBRATES 
  — 
  WHITE 
  421 
  

  

  museums. 
  I 
  have 
  prepared 
  table 
  1 
  (below), 
  partly 
  from 
  the 
  

   Uterature 
  and 
  partly 
  from 
  my 
  knowledge 
  of 
  the 
  collections 
  in 
  a 
  few 
  

   museums, 
  to 
  show 
  the 
  distribution 
  of 
  this 
  group 
  in 
  North 
  America. 
  

   An 
  examination 
  of 
  this 
  table 
  shows 
  that 
  the 
  smaller 
  form, 
  Parictis, 
  

   persisted 
  from 
  the 
  Lower 
  Ohgocene 
  into 
  the 
  Lower 
  Miocene, 
  while 
  

   Daphoenocyon 
  continued 
  only 
  into 
  the 
  Middle 
  Ohgocene 
  (Hough, 
  1948, 
  

   p. 
  595) 
  and 
  we 
  have 
  no 
  record 
  of 
  it 
  after 
  that. 
  In 
  the 
  Lower 
  Miocene 
  

   two 
  new 
  forms 
  appeared, 
  Pachycynodon 
  and 
  the 
  form 
  from 
  Florida 
  

   which 
  I 
  described 
  as 
  Parictis 
  bathygenus 
  White 
  (1947, 
  p. 
  500). 
  Even 
  

   though 
  the 
  available 
  data 
  are 
  limited, 
  they 
  appear 
  to 
  substantiate 
  

   the 
  opinion 
  (Simpson, 
  1947, 
  p. 
  630) 
  that 
  this 
  group 
  is 
  Eurasian 
  in 
  

   origin 
  and 
  immigrated 
  to 
  North 
  America. 
  Also 
  it 
  appears 
  that 
  there 
  

  

  USNM 
  

   19094 
  

  

  Figure 
  SO. 
  — 
  Occlusal 
  view 
  of 
  dPj_4 
  and 
  Mi-a 
  (USNM 
  19094) 
  of 
  Daphoenocyon 
  dodgei 
  

   (Scott). 
  X 
  1^. 
  

  

  was 
  a 
  migration 
  in 
  the 
  Lower 
  Ohgocene 
  and 
  another 
  in 
  the 
  Lower 
  

   Miocene, 
  since 
  neither 
  Pachycynodon 
  nor 
  Parictis 
  bathygenus 
  are 
  

   at 
  all 
  closely 
  related 
  to 
  the 
  American 
  Ohgocene 
  forms. 
  

  

  Table 
  1. 
  — 
  Distribution 
  of 
  the 
  Amphicynodontinae 
  in 
  the 
  Early 
  Tertiary 
  of 
  North 
  

  

  America 
  

  

  Order 
  PERISSODACTYLA 
  

   Family 
  Equidae 
  

  

  Mesohippus 
  hypostylus 
  Osborn 
  

  

  CM 
  9184, 
  left 
  maxilla 
  with 
  M^""; 
  CM 
  8998, 
  palate 
  with 
  right 
  and 
  

   left 
  P2-M2; 
  unnumbered, 
  right 
  maxilla 
  with 
  M^-^; 
  USNM 
  18946, 
  skull 
  

  

  