﻿CANYON 
  FERRY 
  FOSSIL 
  VERTEBRATES 
  — 
  WHITE 
  403 
  

  

  Order 
  INSECTIVORA 
  

   Family 
  Solenodontidae 
  

  

  Apternodus 
  mediaevus 
  Matthew 
  

  

  USNM 
  18914, 
  fragment 
  of 
  right 
  maxilla 
  with 
  M^ 
  from 
  locality 
  

   No. 
  24LC16; 
  CM 
  Field 
  No. 
  30/48, 
  skull 
  and 
  jaws 
  somewhat 
  crushed, 
  

   from 
  locahty 
  No. 
  24BW18. 
  

  

  The 
  discovery 
  of 
  the 
  skull 
  and 
  jaws 
  was 
  unusually 
  fortunate 
  in 
  

   that 
  they 
  show 
  the 
  character 
  of 
  the 
  enlarged 
  upper 
  and 
  lower 
  first 
  (?) 
  

   incisors. 
  

  

  Description. 
  — 
  Upper 
  incisor 
  is 
  simple, 
  placed 
  nearly 
  vertical 
  in 
  the 
  pre- 
  

   maxilla, 
  tapering 
  very 
  slightly 
  in 
  width 
  toward 
  the 
  tip 
  and 
  slanted 
  medi- 
  

   ally 
  so 
  that 
  the 
  tips 
  meet, 
  stronger 
  anteroposterior 
  taper 
  which 
  extends 
  

   from 
  base 
  to 
  tip 
  on 
  the 
  posterior 
  side, 
  anterior 
  face 
  slightly 
  convex 
  

   dorsoventrally 
  and 
  with 
  uniform 
  curvature, 
  enamel 
  covered 
  except 
  

   at 
  tip 
  where 
  worn. 
  Lower 
  incisor 
  is 
  simple, 
  making 
  a 
  very 
  obtuse 
  

   angle 
  with 
  the 
  axis 
  of 
  the 
  jaw, 
  medial 
  face 
  flattened, 
  lateral 
  surface 
  

   convex, 
  very 
  slight 
  taper 
  in 
  width, 
  anteroposterior 
  taper 
  from 
  base 
  

   to 
  tip, 
  tooth 
  enamel 
  covered. 
  

  

  Family 
  Leptictidae 
  

  

  Ictops 
  acutidens 
  Douglass 
  

  

  USNM 
  18910, 
  badly 
  broken 
  skull 
  and 
  jaws 
  with 
  skeletal 
  fragments; 
  

   USNM 
  18912, 
  left 
  maxillary 
  fragment 
  with 
  P*-M^ 
  Both 
  specimens 
  

   are 
  from 
  locahty 
  No. 
  24LC16. 
  

  

  This 
  material 
  does 
  not 
  permit 
  any 
  additions 
  to 
  be 
  made 
  to 
  Mat- 
  

   thew's 
  (1903, 
  p. 
  207) 
  discussion 
  of 
  the 
  species. 
  

  

  Family 
  Talpidae 
  

  

  C^nus 
  and 
  species 
  undetermined 
  

  

  USNM 
  18915, 
  right 
  humerus 
  lacking 
  the 
  distal 
  epiphysis, 
  from 
  

   locahty 
  No. 
  24LC16; 
  USNM 
  19024, 
  right 
  humerus 
  lacking 
  the 
  distal 
  

   epiphysis, 
  from 
  Pipestone 
  Springs; 
  CM 
  9184, 
  right 
  humerus 
  lacking 
  

   the 
  distal 
  epiphysis, 
  from 
  locality 
  No. 
  24BW18. 
  

  

  Discussion. 
  — 
  A 
  comparison 
  of 
  this 
  material 
  with 
  the 
  humeri 
  of 
  

   recent 
  moles 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  does 
  not 
  reveal 
  any 
  

   close 
  affinities 
  with 
  any 
  of 
  the 
  genera 
  represented. 
  On 
  the 
  other 
  

   han'd, 
  the 
  derivation 
  of 
  the 
  humerus 
  of 
  the 
  Talpinae 
  and 
  Scalopinae 
  

   from 
  this 
  type 
  of 
  humerus 
  would 
  require 
  only 
  an 
  exaggeration 
  of 
  its 
  

   present 
  characters. 
  Consequently, 
  the 
  reference 
  of 
  this 
  material 
  to 
  

   the 
  Talpidae 
  is 
  reasonably 
  certain, 
  but 
  generic 
  designation 
  will 
  be 
  

   withheld 
  pending 
  the 
  acquisition 
  of 
  better 
  material. 
  

  

  273552—54 
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