﻿Geology 
  and 
  Natural 
  History. 
  155 
  

  

  2. 
  A 
  Revision 
  of 
  the 
  Genera 
  and 
  Sjiecies 
  of 
  Canadian 
  Palaeo- 
  

   zoic 
  Corals, 
  the 
  JIadreporaria 
  Perforata 
  and 
  the 
  Alcyonaria 
  ; 
  

   by 
  Lawrence 
  M. 
  Lambe, 
  pp. 
  1-96, 
  plates 
  i-v, 
  1899. 
  (Contribu- 
  

   tions 
  to 
  Canadian 
  Paleontology, 
  Volume 
  IV, 
  Parti.) 
  — 
  This 
  report 
  

   is 
  particularly 
  interesting 
  as 
  adding 
  to 
  our 
  knowledge 
  of 
  the 
  

   Paleozoic 
  corals 
  some 
  details 
  as 
  to 
  their 
  geological 
  range 
  and 
  the 
  

   characteristics 
  marking 
  their 
  relation 
  to 
  time. 
  The 
  author 
  notes 
  

   that 
  the 
  genus 
  Favosites, 
  when 
  occurring 
  in 
  the 
  Cambro-Silurian 
  

   or 
  Silurian, 
  has 
  spiniform 
  septa 
  whilst 
  those 
  of 
  the 
  Devonian 
  

   have 
  squamulse. 
  This 
  is 
  a 
  confirmation 
  of 
  Rominger's* 
  observa- 
  

   tion. 
  P. 
  Gothlandica 
  is 
  observed 
  to 
  occur 
  at 
  numerous 
  localities 
  

   in 
  the 
  Niagara, 
  Guelph 
  and 
  Lower 
  Helderberg 
  formations, 
  in 
  

   divisions 
  2, 
  3 
  and 
  4 
  of 
  the 
  Anticosti 
  Group 
  and 
  in 
  rocks 
  of 
  sup- 
  

   posed 
  Hudson 
  River 
  age. 
  " 
  The 
  only 
  difference 
  between 
  F. 
  

   Helderberg 
  ice 
  and 
  F. 
  Xiagarensis 
  appears 
  to 
  be 
  in 
  the 
  shape 
  of 
  

   the 
  corallum 
  which 
  in 
  the 
  former 
  species 
  ' 
  is 
  large, 
  lenticular, 
  

   depressed, 
  convex 
  or 
  hemispherical,' 
  and 
  in 
  the 
  latter 
  spherical 
  or 
  

   clavate, 
  a 
  difference 
  which, 
  though 
  slight, 
  may 
  be 
  considered 
  suffi- 
  

   cient, 
  if 
  it 
  be 
  constant, 
  for 
  the 
  separation 
  of 
  the 
  two 
  species." 
  In 
  

   •discussing 
  the 
  genus 
  Calapcecia, 
  the 
  writer 
  has 
  been 
  forced 
  to 
  

   regard 
  V. 
  Canadensis, 
  C. 
  Huronensis 
  and 
  C. 
  Anticostiensis 
  as 
  

   belonging 
  to 
  the 
  same 
  species. 
  Syringopora 
  bifurcata 
  Lonsdale, 
  

   is 
  reported 
  from 
  both 
  the 
  Niagara 
  and 
  Lower 
  Helderberg 
  

   formations. 
  In 
  the 
  discussion 
  of 
  the 
  genus 
  Halysites, 
  Mr. 
  Lambe 
  

   remarks 
  that 
  " 
  Particular 
  stress 
  has 
  been 
  laid 
  on 
  the 
  pres- 
  

   ence 
  or 
  absence 
  of 
  septal 
  spines 
  by 
  Dr. 
  Nicholson. 
  In 
  his 
  ' 
  Palae- 
  

   ozoic 
  Tabulate 
  corals,' 
  p. 
  229, 
  it 
  is 
  stated 
  that 
  ' 
  the 
  form 
  known 
  

   as 
  H. 
  escharoides 
  Lam., 
  is 
  distinguished 
  from 
  the 
  typical 
  H. 
  

   cutenularia 
  Linn., 
  not 
  only 
  by 
  the 
  superficial 
  characters 
  just 
  men- 
  

   tioned, 
  but 
  also 
  by 
  the 
  constant 
  possession 
  of 
  spiniform 
  septa, 
  and 
  

   the 
  apparently 
  constant 
  absence 
  of 
  small 
  tubes 
  between 
  the 
  large 
  

   ones.' 
  This 
  is 
  not 
  borne 
  out, 
  however, 
  by 
  Canadian 
  specimens. 
  

   An 
  example 
  from 
  the 
  Xiagara 
  limestone 
  of 
  Ontario 
  has 
  tubules 
  

   between 
  the 
  corallites 
  admirably 
  shown 
  as 
  well 
  as 
  rows 
  of 
  septal 
  

   spines 
  ; 
  other 
  examples 
  with 
  tubules 
  and 
  septal 
  spines 
  have 
  been 
  

   collected 
  at 
  Lake 
  Teniiscaming 
  (Niagara), 
  at 
  Cross 
  Lake 
  Rapids 
  

   on 
  the 
  Saskatchewan 
  River 
  and 
  .at 
  Cedar 
  Lake 
  (Niagara) 
  and 
  

   from 
  the 
  Lower 
  Helderberg 
  rocks 
  of 
  l'Anse-au-Gascon, 
  l'Anse 
  a, 
  

   la 
  Barbe, 
  etc., 
  Baie 
  des 
  Chaleurs. 
  When 
  the 
  tubules 
  are 
  present 
  

   and 
  the 
  septal 
  spines 
  are 
  not 
  seen, 
  it 
  is 
  possible 
  that 
  the 
  latter, 
  

   on 
  account 
  of 
  their 
  small 
  size, 
  have 
  not 
  been 
  preserved 
  or 
  are 
  not 
  

   sufficiently 
  distinct 
  to 
  be 
  recognized. 
  The 
  gradation 
  of 
  one 
  form 
  

   of 
  II. 
  catc/vdaria 
  into 
  another 
  would 
  lead 
  to 
  the 
  belief 
  that 
  it 
  

   consists 
  of 
  one 
  typical 
  form 
  with 
  several 
  stratigraphical 
  varieties 
  ; 
  

   the 
  typical 
  form 
  not 
  being 
  the 
  oldest." 
  

  

  From 
  a 
  comparative 
  study 
  of 
  the 
  Canadian 
  specimens, 
  he 
  con- 
  

   cludes, 
  u 
  that 
  H. 
  catenularia 
  and 
  its 
  varieties 
  range 
  from 
  the 
  

   Black 
  River 
  limestone 
  at 
  the 
  base 
  of 
  the 
  Trenton 
  formation 
  up 
  

   to 
  the 
  rocks 
  of 
  the 
  Lower 
  Helderberg 
  Group 
  ; 
  and 
  that 
  the 
  Black 
  

  

  -Geological 
  Survey 
  of 
  Michigan, 
  Fossil 
  Corals, 
  p. 
  19, 
  1876. 
  

  

  