﻿102 
  LAND 
  PLANTS 
  FROM 
  THE 
  PEN-Y-GLOG 
  SLATE-QUARRY, 
  N. 
  WALES. 
  

  

  nected 
  with 
  the 
  structure 
  of 
  the 
  plants, 
  but 
  that 
  possibly 
  they 
  were 
  

   spores 
  of 
  some 
  kind. 
  The 
  structure 
  of 
  the 
  shale 
  seemed 
  interesting 
  

   and 
  should 
  be 
  further 
  carefully 
  examined. 
  The 
  plants 
  of 
  the 
  

   Halifax 
  Coal-measures 
  were 
  derived 
  from 
  the 
  Ganister 
  series, 
  where 
  

   they 
  were 
  associated 
  with 
  Aviculojpecten, 
  Goniatites, 
  and 
  other 
  

   marine 
  forms. 
  

  

  The 
  President 
  said 
  that 
  the 
  cortical 
  portions 
  of 
  Sigillaria 
  in 
  the 
  

   sandstone 
  of 
  the 
  Pennant 
  measures 
  were 
  often 
  converted 
  into 
  a 
  

   substance 
  resembling 
  anthracite. 
  Some 
  of 
  the 
  specimens 
  of 
  Dr. 
  

   Hicks 
  could 
  hardly 
  be 
  other 
  than 
  vegetable. 
  

  

  Dr. 
  Hicks 
  said 
  he 
  had 
  referred 
  in 
  his 
  previous 
  paper 
  to 
  Glypto- 
  

   dendron. 
  It 
  was 
  as 
  nearly 
  as 
  possible 
  on 
  the 
  same 
  horizon. 
  The 
  

   structure 
  noticed 
  by 
  Prof. 
  Duncan 
  was 
  natural 
  to 
  the 
  anthracite. 
  

   Plants 
  were 
  commonly 
  found 
  in 
  these 
  older 
  beds 
  associated 
  with 
  

   marine 
  remains. 
  He 
  had 
  referred 
  to 
  the 
  fact 
  that 
  all 
  the 
  plant- 
  

   remains 
  were 
  in 
  a 
  fragmentary 
  condition, 
  and 
  that 
  they 
  must 
  have 
  

   drifted 
  into 
  their 
  present 
  positions. 
  

  

  

  