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  THE 
  EXTINCT 
  VERTEBRATE 
  ANIMALS 
  

  

  slightly 
  deeper 
  below 
  than 
  above, 
  is 
  highly 
  probable, 
  but 
  I 
  fail 
  to 
  

   see 
  any 
  evidence 
  of 
  the 
  existence 
  of 
  a 
  heterocercal 
  tail 
  such 
  as 
  is 
  

   shown 
  in 
  Mr. 
  Woodward's 
  figure. 
  

  

  Genus 
  HOMOSTEUS, 
  Asmuss. 
  

  

  (Asterolepis, 
  Agassiz 
  pars, 
  non 
  Eichwald.) 
  

  

  Homosteus 
  Milleri, 
  Traquair, 
  1888. 
  

  

  Syn. 
  Asterolepis, 
  Hugh 
  Miller 
  ; 
  Asterolepis 
  Asmusii, 
  J. 
  Morris 
  (non 
  

   Agassiz). 
  

  

  (Outline 
  of 
  cranial 
  and 
  dorsal 
  shields, 
  PI. 
  iv. 
  fig. 
  2.) 
  

   This 
  great 
  Coccostean, 
  which 
  formed 
  the 
  text 
  to 
  Hugh 
  Miller's 
  well- 
  

   known 
  work, 
  Footprints 
  of 
  the 
  Creator, 
  or 
  the 
  Asterolepis 
  of 
  Strom- 
  

   ness, 
  is 
  very 
  rare 
  in 
  the 
  Moray 
  Firth 
  region. 
  In 
  fact, 
  I 
  only 
  know 
  

   of 
  one 
  instance 
  of 
  its 
  occurrence, 
  namely, 
  a 
  head 
  with 
  dorsal 
  plates 
  

   in 
  situ, 
  from 
  Hillhead 
  quarry 
  near 
  Dalcross, 
  which 
  is 
  in 
  the 
  collec- 
  

   tion 
  of 
  the 
  Geological 
  Survey 
  of 
  Scotland. 
  It 
  occurs 
  in 
  Orkney, 
  

   but 
  it 
  is 
  from 
  the 
  neighbourhood 
  of 
  Thurso, 
  in 
  Caithness, 
  that 
  the 
  

   greater 
  number 
  of 
  specimens 
  have 
  hitherto 
  been 
  obtained. 
  

  

  Order 
  ACIPENSEROIDEI. 
  

   Family 
  PAKEONISCnXE. 
  

  

  Genus 
  CHEIROLEPIS, 
  Agassiz. 
  

   Cheirolepis 
  Trail 
  I 
  i, 
  Agassiz, 
  1835. 
  

  

  Syn. 
  Ch. 
  uragus, 
  Ag. 
  ; 
  Ch. 
  Cummingiaz, 
  Ag. 
  ; 
  Ch. 
  curtus, 
  M'Coy 
  ; 
  Ch. 
  

   rmcrocephalus, 
  M'Coy 
  ; 
  Ch. 
  velox, 
  M'Coy. 
  

  

  (Restored 
  figure, 
  PI. 
  iii. 
  fig. 
  4.) 
  

   Edderton 
  j 
  Cromarty 
  ; 
  Lethen 
  Bar 
  ; 
  Clune 
  ; 
  Tynet 
  Burn 
  ; 
  Gamrie. 
  

   Agassiz 
  distinguished 
  two 
  species 
  of 
  Cheirolepis 
  from 
  the 
  Moray 
  

   Firth 
  nodules, 
  namely, 
  uragus 
  from 
  Gamrie, 
  and 
  Cummingioz 
  from 
  

   Lethen 
  Bar, 
  but 
  the 
  sole 
  difference 
  lies 
  in 
  the 
  mode 
  of 
  preservation, 
  

   the 
  outer 
  ganoine 
  layer 
  of 
  the 
  scales 
  being 
  shown 
  in 
  specimens 
  

   from 
  Cromarty 
  and 
  Gamrie, 
  whereas 
  in 
  those 
  from 
  Lethen, 
  Clune, 
  

   and 
  Tynet, 
  it 
  generally 
  adheres 
  to 
  the 
  matrix, 
  and 
  the 
  external 
  

   striated 
  sculpture 
  of 
  the 
  scales 
  is 
  consequently 
  invisible. 
  But 
  both 
  

   of 
  these 
  presumed 
  species 
  are 
  identical 
  with 
  his 
  Ch. 
  Trailli 
  from 
  

   Orkney, 
  and 
  upon 
  Orkney 
  specimens 
  M 
  f 
  Coy 
  manufactured 
  still 
  

  

  