﻿244 
  

  

  THE 
  EXTINCT 
  VERTEBRATE 
  ANIMALS 
  

  

  Class 
  PISCES. 
  

  

  Sub-class 
  ELASMOBRANCHIL 
  

   Order 
  ACANTHODEI. 
  

   Family 
  DIPLACANTHIDiE. 
  

  

  Genus 
  DIP 
  LA 
  CANTH 
  US, 
  Agassiz. 
  

   Diplacanthus 
  striatus, 
  Agassiz, 
  1844. 
  

   Syn. 
  D. 
  striatulus, 
  Agassiz 
  ; 
  D. 
  crassispinus, 
  Agassiz 
  ; 
  D. 
  gibbus, 
  M'Coy. 
  

   (Restored 
  figure, 
  PI. 
  ii. 
  fig. 
  1.) 
  

   Especially 
  common 
  at 
  Cromarty, 
  but 
  also 
  occurring 
  at 
  Lethen, 
  Clune, 
  

   Tynet 
  Burn, 
  and 
  Gamrie. 
  Those 
  from 
  Lethen 
  and 
  Tynet 
  were 
  

   distinguished 
  by 
  Agassiz 
  under 
  the 
  name 
  of 
  D. 
  striatulus, 
  but 
  

   they 
  are 
  undoubtedly 
  identical 
  with 
  the 
  Cromarty 
  types, 
  except 
  

   in 
  colour 
  and 
  mode 
  of 
  preservation. 
  D. 
  crassispinus, 
  Agass., 
  and 
  

   D. 
  gibbus, 
  M'Coy, 
  from 
  the 
  Orkney 
  flags, 
  are 
  also 
  synonyms. 
  

   D. 
  striatus 
  occurs 
  also 
  at 
  Achanarras 
  in 
  Caithness. 
  

  

  Diplacanthus 
  tenuistriatus, 
  Traquair, 
  1894. 
  

  

  Rare. 
  I 
  only 
  know 
  of 
  three 
  specimens, 
  all 
  of 
  which 
  are 
  in 
  the 
  

   Museum 
  of 
  Science 
  and 
  Art, 
  Edinburgh. 
  One 
  of 
  these, 
  from 
  

   Cromarty, 
  is 
  in 
  the 
  Hugh 
  Miller 
  collection, 
  the 
  other 
  two 
  were 
  

   found 
  at 
  Gamrie 
  by 
  Mr. 
  Jex, 
  collector 
  to 
  Mr. 
  R. 
  F. 
  Damon 
  of 
  

   Weymouth. 
  

  

  Genus 
  BHA 
  DIN 
  A 
  CAN 
  THUS, 
  Traquair, 
  1888. 
  

   Rhadinacanthus 
  longispinus 
  (Agassiz), 
  1844. 
  

   Syn. 
  Diplacanthus 
  longispinus, 
  Ag. 
  et 
  cet. 
  auct. 
  ; 
  D. 
  perarmatus, 
  M'Coy. 
  

   Distinguished 
  by 
  its 
  long 
  slender 
  spines 
  and 
  its 
  sharply 
  and 
  beauti- 
  

   fully 
  sculptured 
  scales. 
  Diplacanthus 
  perarmatus, 
  M'Coy, 
  from 
  

   Orkney, 
  belongs 
  unquestionably 
  to 
  the 
  same 
  species, 
  which 
  also 
  

   occurs 
  at 
  Achanarras 
  in 
  Caithness. 
  

  

  In 
  the 
  Moray 
  Firth 
  area 
  it 
  is 
  rather 
  rare, 
  except 
  at 
  Gamrie, 
  

   where 
  many 
  fine 
  specimens 
  have 
  been 
  collected. 
  The 
  type 
  speci- 
  

   men 
  is 
  however 
  from 
  Cromarty, 
  and 
  it 
  also 
  occurs 
  at 
  Lethen 
  and 
  

   Tynet. 
  

  

  A 
  closely 
  allied 
  species, 
  E. 
  (Diplacanthus) 
  horridus, 
  has 
  been 
  

   described 
  by 
  Mr. 
  Smith 
  Woodward 
  from 
  the 
  Upper 
  Devonian 
  of 
  

   Canada. 
  

  

  