﻿1864.] 
  POWRIE 
  FORFARSHIRE 
  FOSSILS. 
  415 
  

  

  The 
  most 
  prevalent 
  organisms 
  found 
  in 
  the 
  Forfarshire 
  beds 
  are 
  

   evidently 
  of 
  vegetable 
  (Algoid 
  ?) 
  origin. 
  In 
  only 
  one 
  or 
  two 
  in- 
  

   stances 
  have 
  I 
  ever 
  been 
  able 
  to 
  detect 
  in 
  them 
  the 
  slightest 
  trace 
  

   of 
  structure, 
  and 
  in 
  these 
  rare 
  exceptions 
  the 
  traces 
  are 
  exceed- 
  

   ingly 
  indistinct. 
  Burrows 
  and 
  tracks 
  which 
  may 
  have 
  been 
  formed 
  

   by 
  Annelids 
  are 
  not 
  uncommon 
  ; 
  but 
  the 
  only 
  animal-remains, 
  pro- 
  

   perly 
  so 
  called, 
  belong 
  entirely 
  to 
  the 
  classes 
  Crustacea 
  and 
  Pisces. 
  

  

  CRUSTACEA. 
  

  

  Crustacean 
  remains 
  are 
  very 
  widely 
  and 
  very 
  generally 
  distributed 
  

   through 
  those 
  beds 
  which 
  may 
  be 
  called 
  the 
  Arbroath 
  pavement- 
  

   beds, 
  and 
  are 
  found 
  in 
  nearly 
  equal 
  abundance 
  in 
  all. 
  Excepting 
  a 
  

   very 
  few 
  favoured 
  localities, 
  good 
  specimens 
  are 
  only 
  to 
  be 
  got 
  when 
  

   the 
  rocks 
  have 
  been 
  largely 
  quarried. 
  As 
  Mr. 
  H. 
  Woodward 
  has 
  at 
  

   present 
  this 
  class 
  in 
  hand 
  (a 
  task 
  for 
  which 
  his 
  acquirements 
  and 
  

   opportunities 
  so 
  eminently 
  fit 
  him), 
  I 
  shall 
  here 
  merely 
  indicate 
  the 
  

   various 
  genera 
  and 
  species 
  which 
  have 
  as 
  yet 
  been 
  found 
  in 
  the 
  For- 
  

   farshire 
  rocks. 
  

  

  The 
  following 
  four 
  genera 
  have, 
  up 
  to 
  the 
  present 
  time, 
  been 
  

   found 
  : 
  — 
  

  

  Campicaris, 
  Page. 
  

  

  The 
  only 
  known 
  species 
  of 
  this 
  curious 
  larva-looking 
  creature 
  is 
  

   the 
  Campicaris 
  Forfarensis, 
  Page 
  ; 
  it 
  occurs 
  in 
  Canterland 
  Den 
  in 
  

   Kincardineshire, 
  and 
  Balruddery 
  Den 
  in 
  Forfarshire. 
  

  

  Pterygotus, 
  Agassiz. 
  

   This 
  genus 
  appears 
  to 
  be 
  represented 
  by 
  only 
  one 
  species, 
  Ptery- 
  

   gotus 
  Anglicus. 
  Fragments 
  of 
  it 
  are, 
  however, 
  much 
  more 
  frequently 
  

   to 
  be 
  met 
  with 
  than 
  of 
  all 
  the 
  other 
  genera 
  which 
  lived 
  in 
  the 
  

   waters 
  in 
  which 
  the 
  Forfarshire 
  rocks 
  were 
  deposited. 
  This 
  crea- 
  

   ture 
  varied 
  much 
  in 
  size 
  ; 
  plates 
  in 
  my 
  collection 
  indicate 
  the 
  

   gigantic 
  length 
  of 
  at 
  least 
  6 
  feet, 
  by 
  over 
  18 
  inches 
  in 
  breadth, 
  

   while 
  some 
  moderately 
  complete 
  specimens 
  are 
  barely 
  6 
  inches 
  long. 
  

   Mr. 
  Page's 
  restoration, 
  in 
  his 
  * 
  Advanced 
  Text-Book,' 
  is 
  the 
  best 
  

   published, 
  embodying 
  nearly 
  all 
  that 
  is 
  known 
  with 
  certainty 
  of 
  

   this 
  species. 
  Fragments 
  of 
  Pterygotus 
  punctatus 
  have 
  also 
  been 
  

   found, 
  but 
  this 
  species 
  I 
  understand 
  belongs 
  to 
  the 
  genus 
  Stylonurus 
  

   rather 
  than 
  Pterygotus. 
  

  

  Eurypterus, 
  Dekay. 
  

   Mr. 
  Walter 
  M 
  c 
  Nicol 
  discovered 
  a 
  solitary 
  specimen 
  seemingly 
  of 
  

   Eurypterus 
  pygmceus, 
  Salter 
  ; 
  and 
  the 
  Rev. 
  H. 
  Brewster 
  obtained 
  

   from 
  the 
  deposit 
  at 
  Farnell 
  what 
  appears, 
  from 
  the 
  position 
  of 
  the 
  

   eyes 
  and 
  the 
  narrow 
  telson, 
  to 
  be 
  a 
  new 
  species 
  of 
  this 
  genus. 
  

  

  Stylonurus, 
  Page, 
  

  

  Is 
  represented 
  by 
  the 
  Stylonurus 
  Powriei, 
  Page, 
  and 
  by 
  at 
  least 
  

   one 
  other 
  new 
  species, 
  almost 
  rivalling 
  in 
  size 
  the 
  larger 
  specimens 
  

   of 
  Pterygotus 
  Anglicus. 
  

  

  Besides 
  these, 
  several 
  fragments 
  in 
  my 
  collection 
  indicate 
  other 
  

  

  distinct 
  snecies 
  of 
  Ettrypterus 
  and 
  Stylonurus. 
  . 
  . 
  

  

  2g2 
  

  

  