﻿CANYON 
  FERRY 
  FOSSIL 
  VERTEBRATES 
  — 
  ^WHITE 
  409 
  

  

  Family 
  Eomyidae 
  

  

  Paradjidaumo 
  cf. 
  minor 
  (Douglass) 
  

  

  USNM 
  18759, 
  left 
  mandible 
  with 
  P4-M3, 
  from 
  locality 
  No. 
  24LC16; 
  

   USNM 
  18758, 
  right 
  mandible 
  with 
  P4-M2, 
  from 
  locality 
  No. 
  24LC17. 
  

  

  Discussion. 
  — 
  In 
  size, 
  this 
  material 
  agrees 
  with 
  both 
  size 
  groups 
  

   which 
  Wood 
  (1937, 
  p. 
  244) 
  records 
  from 
  Pipestone 
  Springs, 
  but 
  it 
  

   differs 
  in 
  that 
  Mi 
  and 
  M2 
  are 
  broader 
  than 
  long 
  in 
  both 
  specimens. 
  

   One 
  cf 
  the 
  specimens 
  measured 
  by 
  Wood 
  (AMNH 
  9635) 
  shows 
  this 
  

   condition, 
  but 
  with 
  such 
  a 
  limited 
  sample 
  it 
  is 
  impossible 
  to 
  properly 
  

   evaluate 
  this 
  character. 
  

  

  Although 
  one 
  of 
  these 
  specimens 
  is 
  from 
  the 
  Chadron 
  equivalent 
  

   and 
  the 
  other 
  from 
  the 
  Lower 
  Brule 
  equivalent, 
  I 
  could 
  find 
  no 
  

   morphological 
  characters 
  of 
  the 
  teeth 
  which 
  would 
  separate 
  them. 
  

   Also, 
  in 
  the 
  Paradjidaumo 
  material 
  from 
  Pipestone 
  Springs 
  in 
  the 
  

   U. 
  S. 
  National 
  Museum 
  there 
  is 
  one 
  specimen 
  which 
  agrees 
  with 
  

   P. 
  trilophus 
  in 
  its 
  dental 
  morphology, 
  including 
  the 
  flattened 
  anterior 
  

   face 
  of 
  the 
  lower 
  incisor. 
  In 
  view 
  of 
  the 
  above 
  facts 
  and 
  the 
  variation 
  

   in 
  size 
  and 
  tooth 
  proportions 
  found 
  in 
  the 
  material 
  from 
  Pipestone 
  

   Springs 
  and 
  the 
  Badlands, 
  it 
  is 
  difficult 
  to 
  escape 
  the 
  inference 
  that 
  

   P. 
  minor 
  and 
  P. 
  trilophus 
  represent 
  species 
  groups 
  rather 
  than 
  single 
  

   species. 
  Measurements 
  of 
  teeth 
  (in 
  millimeters): 
  

  

  P4-M3 
  

  

  P4 
  

  

  M, 
  

  

  M2 
  

  

  Ms 
  

  

  Paradjidaumo 
  spokanensis, 
  new 
  species 
  

  

  Holotype. 
  — 
  USNM 
  18760, 
  a 
  badly 
  crushed 
  skull 
  with 
  right 
  mandible. 
  

  

  Horizon 
  and 
  locality. 
  — 
  Middle 
  Oligocene, 
  Orellan; 
  SE^SE)^ 
  sec. 
  10, 
  

   T. 
  10 
  N., 
  R. 
  1 
  W., 
  of 
  the 
  Montana 
  prime 
  meridian, 
  about 
  ji 
  mile 
  

   southeast 
  of 
  Canyon 
  Ferry, 
  Lewis 
  and 
  Clark 
  County, 
  Mont. 
  

  

  Diagnosis. 
  — 
  Upper 
  teeth 
  broader 
  than 
  long 
  with 
  mesoloph 
  extending 
  

   to 
  labial 
  margin, 
  posterior 
  cingulum 
  uniting 
  with 
  hypocone 
  and 
  

   extending 
  nearly 
  to 
  labial 
  margin, 
  mure 
  extending 
  nearly 
  to 
  middle 
  of 
  

   tooth, 
  shortest 
  on 
  P* 
  and 
  longest 
  on 
  M^ 
  . 
  Lower 
  teeth 
  with 
  mesolophid 
  

   long, 
  extending 
  to 
  lingual 
  margin, 
  free 
  on 
  P4 
  and 
  Mi 
  but 
  uniting 
  with 
  

   entoconid 
  on 
  M2 
  and 
  M3 
  with 
  wear. 
  P4 
  longer 
  than 
  broad 
  and 
  M3 
  

   nearly 
  as 
  broad 
  as 
  long. 
  Measurements 
  of 
  teeth 
  (in 
  millimeters) 
  : 
  

  

  