﻿46 
  A. 
  W. 
  EDGELL 
  ON 
  BEDLEIGH-SAXTERTON 
  LAMELLIBBANCHS. 
  

  

  almost 
  horizontal 
  ; 
  the 
  bedding 
  is 
  otherwise 
  obscure. 
  The 
  strike 
  

   appears 
  to 
  be 
  about 
  N.W. 
  and 
  S.E. 
  

  

  I 
  cannot 
  help 
  thinking 
  that 
  a 
  closer 
  acquaintance 
  with 
  the 
  beds 
  

   of 
  Normandy 
  and 
  Brittany 
  will 
  assist 
  persons 
  acquainted 
  with 
  the 
  

   Budleigh-Salterton 
  bed 
  to 
  refer 
  each 
  pebble 
  to 
  its 
  proper 
  origin, 
  

   though 
  the 
  resemblance 
  between 
  the 
  Silurian 
  and 
  Devonian 
  quart- 
  

   zites 
  of 
  France 
  in 
  some 
  cases 
  is 
  very 
  great 
  indeed. 
  The 
  figures 
  

   given 
  here 
  are 
  all 
  of 
  the 
  natural 
  size*. 
  

  

  Modiolopsis 
  Armorici 
  (Salter). 
  PI. 
  IV. 
  figs. 
  1, 
  la. 
  (Mr. 
  Vicary's 
  

   collection.) 
  

  

  Syn. 
  Modiolopsis 
  armoricana 
  ; 
  M. 
  armorica, 
  Bigsby, 
  * 
  Thesaurus 
  

   Siluricus 
  ;' 
  Avicula 
  prima, 
  D'Orbigny, 
  ' 
  Prodrome.' 
  

  

  This 
  figure 
  has 
  been 
  recognized 
  by 
  all 
  the 
  three 
  above-named 
  

   gentlemen 
  ; 
  and 
  M. 
  Bayan 
  found 
  a 
  specimen 
  in 
  M. 
  de 
  Yerneuil's 
  

   collection 
  labelled 
  " 
  Modiolopsis 
  armoricana, 
  Salter. 
  Avicula 
  prima, 
  

   D'Orb." 
  The 
  figure 
  given 
  by 
  Salter, 
  Q. 
  J. 
  G. 
  S. 
  vol. 
  xx. 
  pi. 
  16. 
  fig. 
  1, 
  

   is, 
  as 
  I 
  believe, 
  the 
  interior 
  cast 
  of 
  this 
  ; 
  such 
  interior 
  casts 
  are 
  com- 
  

   mon 
  and 
  variable 
  in 
  form. 
  I 
  have 
  figured 
  one 
  from 
  my 
  collection, 
  

   PI. 
  V. 
  fig. 
  6. 
  As 
  it 
  is 
  clearly 
  not 
  an 
  Avicula, 
  I 
  have 
  kept 
  Salter's 
  

   name. 
  

  

  Modiolopsis 
  Lebesconti, 
  sp. 
  nov. 
  PI. 
  IV. 
  figs. 
  2, 
  2a. 
  (Mr. 
  Vicary's 
  

   collection.) 
  

  

  The 
  outline 
  of 
  this, 
  which 
  I 
  take 
  to 
  be 
  an 
  interior 
  cast, 
  differs 
  

   from 
  that 
  of 
  any 
  other 
  in 
  Mr. 
  Vicary's 
  collection. 
  The 
  cast 
  is 
  ovate, 
  

   rather 
  gibbous 
  at 
  about 
  one 
  third 
  from 
  the 
  hinge 
  ; 
  and 
  the 
  gibbosity 
  

   decreases 
  more 
  rapidly 
  towards 
  the 
  hinge-line 
  than 
  towards 
  the 
  

   ventral 
  margin. 
  The 
  pallial 
  impression 
  is 
  visible 
  in 
  places 
  in 
  a 
  

   strong 
  light. 
  Length 
  2 
  in. 
  7| 
  lines; 
  breadth 
  (from 
  hinge-line 
  to 
  

   ventral 
  margin) 
  1 
  in. 
  7 
  lines 
  ; 
  thickness 
  4 
  lines. 
  I 
  have 
  ventured 
  to 
  

   name 
  this 
  after 
  M. 
  Lebesconte, 
  of 
  Bennes, 
  as 
  I 
  am 
  informed 
  that, 
  

   though 
  known 
  in 
  May, 
  it 
  has 
  received 
  no 
  name. 
  

  

  SANoumoLiTES 
  ? 
  sp. 
  (contortus, 
  Salter?) 
  PI. 
  IV. 
  figs. 
  3, 
  3a. 
  (Mr. 
  

   Vicary's 
  collection.) 
  

  

  This 
  appears 
  to 
  be 
  crushed 
  ; 
  but 
  Mr. 
  Vicary 
  informs 
  me 
  that 
  it 
  

   was 
  not 
  considered 
  by 
  Mr. 
  Salter 
  to 
  be 
  so. 
  The 
  left 
  valve 
  is 
  convex 
  

   along 
  the 
  hinge-line, 
  while 
  the 
  right 
  valve, 
  from 
  the 
  beak 
  to 
  the 
  anal 
  

   angle, 
  is 
  concave. 
  The 
  beak 
  of 
  the 
  left 
  valve 
  curves 
  over 
  the 
  hinge- 
  

   line, 
  which 
  is 
  straight 
  ; 
  it 
  is 
  marked 
  by 
  irregular 
  lines 
  of 
  growth. 
  

   Length 
  of 
  hinge-line 
  1 
  in. 
  2 
  lines 
  ; 
  from 
  hinge-line 
  to 
  ventral 
  margin 
  

   10| 
  lines. 
  It 
  answers, 
  as 
  well 
  as 
  can 
  be 
  observed, 
  to 
  the 
  genus 
  it 
  is 
  

   here 
  referred 
  to 
  ; 
  it 
  bears 
  a 
  label 
  " 
  allied 
  to 
  Sanguinolites 
  contortus," 
  

   which 
  I 
  believe 
  to 
  be 
  in 
  Mr. 
  Salter's 
  writing. 
  This 
  form 
  is 
  recog- 
  

   nized 
  by 
  M. 
  Lebesconte 
  as 
  French. 
  

  

  * 
  Since 
  the 
  above 
  remarks 
  were 
  written, 
  I 
  hear 
  from 
  M. 
  de 
  Tromelin 
  that 
  the 
  

   pebbles 
  of 
  Bayeux 
  and 
  Carentan 
  are 
  fossiliferous, 
  Orthis 
  redux 
  being 
  common 
  

   in 
  them. 
  They 
  occur 
  in 
  the 
  Trias, 
  as 
  do 
  the 
  Budleigh 
  pebbles. 
  

  

  