﻿CANYON 
  FERRY 
  FOSSIL 
  VERTEBRATES 
  — 
  ^WHITE 
  

  

  411 
  

  

  c* 
  Lingual 
  portion 
  of 
  anterior 
  cingulum 
  on 
  M2 
  about 
  half 
  as 
  long 
  as 
  

   labial 
  latidens 
  

  

  c' 
  Lingual 
  portion 
  of 
  anterior 
  cingulum 
  on 
  M2 
  obsolete 
  or 
  absent. 
  

  

  spokanensis 
  

   6.* 
  Cross 
  lophs 
  weak, 
  ectolophid 
  strong 
  exiguus 
  

  

  Eumys 
  cricetodontoides, 
  new 
  species 
  

  

  Holotype. 
  — 
  USNM 
  18748 
  (fig. 
  45), 
  right 
  mandible 
  with 
  the 
  incisor 
  

   and 
  Mi_3. 
  

  

  Horizon 
  and 
  locality. 
  — 
  Middle 
  Oligocene, 
  Orellan; 
  SEJiSE}^ 
  sec. 
  10, 
  

   T. 
  10 
  N., 
  K. 
  1 
  W., 
  of 
  the 
  Montana 
  prime 
  meridian, 
  about 
  % 
  mile 
  

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

  

  Figure 
  45. 
  — 
  Occlusal 
  and 
  lateral 
  views 
  of 
  the 
  type 
  (USNM 
  18747) 
  of 
  Eumys 
  cricetodontoides 
  

   new 
  species. 
  X 
  7, 
  

  

  Rejerred 
  material. 
  — 
  USNM 
  18749-18754, 
  six 
  mandibles 
  from 
  the 
  

   same 
  locaUty. 
  

  

  Description 
  of 
  type. 
  — 
  Mi 
  elongate, 
  anteroconid 
  large, 
  nearly 
  as 
  

   wide 
  as 
  tooth, 
  anterior 
  arm 
  of 
  protoconid 
  united 
  with 
  anteroconid 
  

   and 
  posterior 
  arm 
  with 
  the 
  metaconid, 
  mesolophid 
  short 
  but 
  distinct, 
  

   posterior 
  cingulum 
  not 
  united 
  with 
  entoconid; 
  M2 
  quadrangular, 
  

   longer 
  than 
  broad, 
  anterior 
  cingulum 
  extending 
  across 
  anterior 
  

   border 
  of 
  tooth, 
  lingual 
  and 
  labial 
  portions 
  subequal, 
  posterior 
  arm 
  

   of 
  protoconid 
  extending 
  nearly 
  to 
  lingual 
  margin 
  of 
  tooth, 
  closely 
  

   applied 
  but 
  not 
  united 
  with 
  metaconid, 
  mesolophid 
  short 
  but 
  very 
  

  

  273552—54 
  8 
  

  

  