﻿458 
  DR. 
  H. 
  HICKS 
  ON" 
  THE 
  MOKTE 
  SLATES, 
  AND 
  [Aug. 
  1 
  897, 
  

  

  Plate 
  XXXIII. 
  (continued). 
  

  

  Oakhampton 
  House 
  Quarry. 
  

  

  Figs. 
  9-13. 
  Dalmanites 
  (Cryph&us) 
  laciniatus, 
  F. 
  Eomer 
  ?, 
  var. 
  occidentalis. 
  

   11, 
  12. 
  Pygidia 
  showing 
  the 
  terminal 
  spine 
  and 
  the 
  long 
  thorn-like 
  

   lateral 
  spines 
  separated 
  by 
  wide 
  intervals. 
  13. 
  Rather 
  more 
  than 
  half 
  

   the 
  margin 
  of 
  a 
  pygidium 
  with 
  rather 
  broad 
  and 
  closer 
  (but 
  still 
  not 
  

   contiguous) 
  spines. 
  The 
  lowest 
  spine 
  but 
  one 
  is 
  probably 
  the 
  ter- 
  

   minal 
  spine. 
  

   14 
  & 
  15. 
  Aviculoyeeten 
  onundus, 
  sp. 
  nov. 
  14 
  a 
  & 
  15 
  a. 
  Portions 
  of 
  surface 
  

   enlarged, 
  showing 
  the 
  transverse 
  ornament. 
  

  

  Plate 
  XXXIV. 
  

  

  Oakhampton 
  House 
  Quarry. 
  

  

  Figs. 
  1 
  & 
  2. 
  Limoptera 
  semiradiata, 
  Freeh 
  ? 
  la, 
  2 
  a. 
  Portions 
  X 
  3 
  to 
  show 
  the 
  

  

  ornament 
  of 
  the 
  opposite 
  valves. 
  

   Fig. 
  3. 
  Spirifera 
  sp., 
  showing 
  the 
  umbonal 
  portion 
  of 
  the 
  ribs 
  adjacent 
  to 
  an 
  

  

  elongate 
  body 
  of 
  doubtful 
  character. 
  

   Figs. 
  4 
  & 
  5. 
  Rhynchonella 
  hercynica, 
  Kayser 
  ? 
  4 
  is 
  twice 
  nat. 
  size. 
  

  

  6 
  & 
  7. 
  Rhynchonella 
  nympha, 
  Barrande 
  ? 
  (The 
  best 
  fragments 
  of 
  this 
  shell 
  

  

  are 
  too 
  imperfect 
  to 
  convey 
  any 
  idea 
  of 
  it 
  in 
  a 
  drawing.) 
  

   8 
  & 
  9. 
  8trop>heodonta 
  tcsniolata 
  (Sandberger). 
  x 
  2. 
  

  

  Plate 
  XXXV. 
  

  

  Geological 
  Map 
  of 
  a 
  portion 
  of 
  West 
  Somerset, 
  on 
  the 
  scale 
  of 
  

   2 
  miles 
  to 
  the 
  inch. 
  

  

  Discussion. 
  

  

  Mr. 
  Etheridge 
  could 
  not 
  agree 
  with 
  the 
  Author 
  of 
  the 
  paper 
  

   upon 
  the 
  important 
  question 
  at 
  issue, 
  either 
  as 
  to 
  the 
  stratigraphical 
  

   or 
  palgeontological 
  evidence 
  afforded 
  by 
  the 
  Morte 
  Slates 
  justifying 
  

   the 
  assertion 
  that 
  they 
  are 
  ' 
  the 
  oldest 
  rocks 
  in 
  North 
  Devon 
  ' 
  ; 
  and 
  

   he 
  differed 
  entirely 
  from 
  the 
  Author 
  in 
  the 
  conclusions 
  drawn, 
  as 
  

   based 
  upon 
  this 
  assertion. 
  No 
  proof 
  has 
  been 
  shown 
  for 
  the 
  

   attempted 
  change 
  in 
  the 
  stratigraphical 
  position 
  of 
  the 
  Morte 
  Slates 
  

   either 
  in 
  North 
  Devon 
  or 
  West 
  Somerset, 
  the 
  eastern 
  (or 
  West 
  

   Somerset) 
  extension 
  of 
  the 
  North 
  Devon 
  Morte 
  Beds 
  being 
  only 
  a 
  

   continuity 
  of 
  the 
  same 
  set 
  of 
  glossy 
  or 
  slaty 
  beds 
  from 
  Mortehoe 
  to 
  

   the 
  quarries 
  at 
  Oakhampton, 
  and 
  its 
  apparently 
  rich 
  Devonian 
  

   fauna, 
  40 
  miles 
  distant. 
  The 
  few 
  fossils 
  obtained 
  by 
  the 
  Author 
  

   from 
  the 
  western 
  part 
  of 
  the 
  Morte 
  Series 
  were 
  said 
  to 
  be 
  Silurian, 
  

   but 
  close 
  examination 
  shows 
  them 
  to 
  have 
  been 
  wrongly 
  identified. 
  

   This 
  somewhat 
  hasty 
  determination 
  gave 
  rise 
  to 
  the 
  view 
  that 
  the 
  

   Morte 
  Beds 
  must 
  or 
  should 
  be 
  assigned 
  to 
  the 
  Wenlock 
  Group 
  of 
  the 
  

   Upper 
  Silurian, 
  and 
  that 
  as 
  a 
  consequence 
  of 
  their 
  stratigraphical 
  

   position 
  they 
  should 
  be 
  regarded 
  as 
  the 
  oldest 
  rocks 
  in 
  North 
  Devon, 
  

   interstratified 
  in 
  the 
  Middle 
  Devonian 
  Series. 
  No 
  attempt 
  has 
  now 
  

   been 
  made 
  by 
  the 
  Author 
  to 
  establish, 
  or 
  even 
  suggest, 
  how 
  or 
  

   whence 
  this 
  40 
  miles 
  of 
  faulted 
  area, 
  between 
  the 
  Ilfracombe 
  and 
  

  

  