﻿643 
  Geological 
  Society. 
  

  

  PROCEEDINGS 
  OF 
  LEARNED 
  SOCIETIES. 
  

  

  GEOLOGICAL 
  SOCIETY. 
  

  

  January 
  11th, 
  1911.— 
  Prof. 
  W. 
  W. 
  Watts, 
  Sc.D., 
  M.Sc, 
  F.R.S., 
  

   President, 
  in 
  the 
  Chair. 
  

  

  The 
  following 
  communication 
  was 
  read 
  : 
  — 
  

  

  'On 
  a 
  Collection 
  of 
  Insect- 
  Remains 
  from 
  the 
  South 
  Wales 
  

   Coalfield.' 
  By 
  Herbert 
  Bolton, 
  F.R.S.E., 
  F.G.S., 
  Curator 
  of 
  

   the 
  Bristol 
  Natural 
  History 
  Museum. 
  

  

  The 
  Author 
  describes 
  nine 
  examples 
  of 
  insect-remains, 
  all 
  being, 
  

   with 
  one 
  exception, 
  blattoid 
  in 
  character. 
  Seven 
  are 
  described 
  

   as 
  new 
  species. 
  Six 
  of 
  the 
  specimens 
  were 
  obtained 
  from 
  tho 
  

   horizon 
  of 
  the 
  Mynyddislwyn 
  Vein 
  and 
  Swansea 
  Four-Foot 
  Seam 
  ; 
  

   two 
  from 
  shales 
  associated 
  with 
  the 
  Graigola 
  Seam, 
  and 
  a 
  22-inch 
  

   seam 
  occurring 
  40 
  yards 
  below 
  it 
  ; 
  while 
  one 
  specimen 
  was 
  found 
  

   in 
  shales 
  associated 
  with 
  the 
  Rhondda 
  No. 
  2 
  Seam, 
  and 
  therefore 
  

   on 
  the 
  same 
  horizon 
  as 
  the 
  example 
  of 
  Etoblattina 
  (Arehimy- 
  

   laeris) 
  woodwardi, 
  Bolton, 
  previously 
  described 
  by 
  the 
  Author 
  

   in 
  the 
  ' 
  Geological 
  Magazine 
  ' 
  for 
  1910, 
  p. 
  147. 
  

  

  The 
  whole 
  of 
  the 
  insect-remains 
  are 
  referable 
  to 
  three 
  horizons 
  — 
  

   one 
  at 
  the 
  base 
  of 
  the 
  Upper 
  Series 
  of 
  the 
  Coal 
  Measures, 
  and 
  two 
  in 
  

   the 
  upper 
  part 
  of 
  the 
  Pennant 
  Series. 
  Two 
  indeterminate 
  species 
  

   are 
  referred 
  to 
  the 
  genus 
  Arehimylaeris, 
  two 
  to 
  Ifemimylacris, 
  one 
  

   to 
  Arehimylaeris 
  (Schizoblatta), 
  one 
  to 
  Arehimylaeris 
  (Etoblattina 
  J, 
  

   one 
  to 
  Oerablattiaa 
  (Aphthoroblatiina), 
  one 
  to 
  Orthomylacris, 
  and 
  

   one 
  to 
  Lamproptilia. 
  The 
  last-named 
  genus 
  is 
  new 
  to 
  the 
  British 
  

   Coal 
  Measures. 
  Attention 
  is 
  drawn 
  to 
  the 
  association 
  of 
  the 
  blattoid 
  

   remains 
  with 
  Cordaites 
  leaves 
  bearing 
  the 
  impressions 
  of 
  the 
  tests 
  

   of 
  Spirorbis 
  pusillus. 
  The 
  suggestion 
  is 
  put 
  forward 
  that 
  possibly 
  

   Carboniferous 
  cockroaches 
  were 
  not 
  only 
  phytophagous 
  in 
  habit, 
  

   but 
  frequented 
  decaying 
  Cordaites 
  leaves 
  in 
  order 
  to 
  feed 
  upon 
  the 
  

   Spirorbis. 
  

  

  The 
  presence 
  of 
  Archimylacrid 
  and 
  Orthomylacrid 
  forms, 
  no 
  

   less 
  than 
  the 
  presence 
  of 
  a 
  species 
  of 
  Lamproptilia, 
  is 
  considered 
  

   indicative 
  of 
  a 
  considerable 
  advance 
  in 
  insect 
  development 
  in 
  the 
  

   British 
  Carboniferous 
  beyond 
  the 
  more 
  primitive 
  paloeodictyopteran 
  

   types; 
  while 
  their 
  abundance 
  in 
  the 
  Pennant 
  and 
  Upper 
  Series 
  of 
  the 
  

   South 
  Wales 
  Coalfield 
  may 
  justify 
  the 
  hope 
  of 
  finding 
  more 
  primitive 
  

   forms 
  at 
  a 
  lower 
  horizon 
  in 
  the 
  same 
  coalfield. 
  Their 
  occurrence 
  may 
  

   also 
  be 
  indicative 
  of 
  the 
  remains 
  of 
  a 
  terrestrial 
  fauna 
  somewhere 
  

   in 
  the 
  South 
  Wales 
  Coal 
  Measures. 
  

  

  