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  While 
  aptus 
  faunaoccurs 
  only 
  in 
  the 
  Appalachian 
  re- 
  

  

  :i, 
  Canadian 
  basin 
  and 
  the 
  far 
  west 
  and 
  Pacific 
  region, 
  but 
  not 
  

  

  -; 
  of 
  til 
  ppi, 
  Diplograptus 
  a 
  m 
  p 
  1 
  e 
  xi 
  cau 
  lis 
  

  

  is 
  also 
  found 
  in 
  tin* 
  Trenton 
  of 
  central 
  New 
  fork 
  (Middleville, 
  

   Trenton 
  Falls) 
  and 
  in 
  the 
  Lorraine 
  beds 
  of 
  northwestern, 
  New 
  York 
  

  

  rin 
  i. 
  and 
  in 
  [owa 
  (J. 
  F. 
  Janus, 
  foe. 
  cit.). 
  The 
  fauna 
  found 
  by 
  

   Ami 
  associated 
  with 
  the 
  Dicellograptns 
  fauna 
  in 
  the 
  Quebec 
  

  

  ion 
  and 
  tin- 
  fauna 
  of 
  tin* 
  conglomerate 
  beds 
  of 
  ftjoordiener 
  

   kill 
  and 
  Rysedorph 
  hill, 
  arc 
  different 
  in 
  strong 
  features 
  from 
  the 
  

   Trenton 
  of 
  the 
  rest 
  of 
  New 
  York 
  and 
  the 
  stales 
  directly 
  south- 
  

   west 
  of 
  ii. 
  Bere 
  is 
  the 
  genus 
  Christ 
  iania, 
  which 
  has 
  not 
  

  

  n 
  found 
  in 
  the 
  Lower 
  Siluric 
  of 
  North 
  America, 
  but 
  lived 
  at 
  

   that 
  era 
  in 
  Europe-ail 
  waters, 
  the 
  Bohemians 
  genus 
  Pater 
  u 
  la, 
  

   which 
  is 
  well 
  represented 
  in 
  the 
  Normans 
  kill 
  shales 
  and 
  which 
  

   besides 
  has 
  been 
  found 
  only 
  in 
  Canada 
  and 
  is 
  therefore 
  restricted 
  

   to 
  the 
  continental 
  margin; 
  the 
  trilobite 
  genera 
  Agnostus, 
  

   Aegl 
  ina 
  (r 
  e 
  di 
  vi 
  v 
  a 
  Barr. 
  ?), 
  A 
  mjiyx, 
  Dionide 
  (?), 
  ob- 
  

  

  ed 
  by 
  Ami 
  with 
  the 
  Normans 
  kill 
  graptolites, 
  and 
  the 
  genera 
  

   A 
  in 
  \) 
  y 
  x 
  and 
  Kemopleurides 
  in 
  the 
  conglomerate 
  bed 
  of 
  

   Ky>« 
  dorpfa 
  hill, 
  all 
  forms 
  which 
  had 
  apparently 
  become 
  extinct 
  in 
  

   the 
  typical 
  Trenton 
  of 
  New 
  York, 
  but 
  continued 
  to 
  live 
  in 
  Europe. 
  

   Furthermore, 
  as 
  the 
  Normans 
  kill 
  graptolite 
  fauna 
  has 
  been 
  

  

  nd 
  by 
  Lapworth 
  to 
  be 
  an 
  exact 
  correlate 
  of 
  a 
  European 
  grapto- 
  

   lite 
  zone, 
  the 
  conclusion 
  seems 
  to 
  be 
  unavoidable 
  that 
  the 
  Nor- 
  

   mans 
  kill 
  or 
  Dicellograptns 
  fauna 
  was 
  foreign 
  to 
  the 
  American 
  

  

  ; 
  mental 
  platform 
  east 
  of 
  the 
  Mississippi 
  but 
  was 
  at 
  home 
  in 
  

   the 
  oceanic 
  basins 
  of 
  lower 
  Trenton 
  time 
  and 
  entered 
  North 
  

   America 
  along 
  the 
  eastern 
  continental 
  shelf. 
  

  

  The 
  middle 
  Trenton 
  shales 
  of 
  south 
  Troy 
  and 
  Watervliet 
  are, 
  

  

  by 
  the 
  occurrence 
  of 
  Diplograptus 
  amp 
  lexicaulis, 
  

  

  and 
  P 
  r 
  o 
  «• 
  tus 
  p 
  a 
  r 
  v 
  i 
  u 
  s 
  c 
  u 
  Ins. 
  connected 
  with 
  the 
  Trenton 
  

  

  inn 
  Falls 
  and 
  the 
  eastern 
  Mississippi 
  basin. 
  

  

  The 
  [Jtica 
  graptolite 
  fauna 
  is 
  again 
  fully 
  represented 
  in 
  Europe, 
  

  

  quite 
  certainly 
  entered 
  the 
  North 
  American 
  continent 
  

  

  from 
  the 
  northt 
  . 
  asserted 
  by 
  Matthew 
  (47) 
  and 
  the 
  writer 
  

  

  sted 
  by 
  Freeh 
  (54. 
  2:100) 
  the 
  highroad 
  

  

  