﻿452 
  REV. 
  G. 
  E. 
  WHIDBORKE 
  DESCRIPTION 
  OF 
  THE 
  [Aug. 
  1 
  897,. 
  

  

  From 
  Eh. 
  daleklensis, 
  F. 
  Rbmer, 
  1 
  or 
  Eli. 
  livonica, 
  von 
  Buch, 
  2 
  sp.^ 
  

   it 
  seems 
  to 
  differ 
  by 
  the 
  greater 
  number 
  of 
  ribs 
  on 
  its 
  fold. 
  

  

  Stropheodonta 
  tjsniolata 
  (Sandberger). 
  (PI. 
  XXXIV. 
  figs. 
  8 
  & 
  9.) 
  

  

  Locality. 
  Oakhampton 
  Quarry. 
  Three 
  specimens. 
  

  

  Size. 
  About 
  20 
  mm. 
  long 
  by 
  22 
  wide. 
  

  

  Desertion. 
  Semi-oval, 
  flattish 
  ; 
  width 
  nearly 
  if 
  not 
  quite 
  equal 
  

   to 
  length; 
  apparently 
  geniculate 
  near 
  the 
  margins. 
  Hinge-line 
  

   equal 
  to 
  greatest 
  length, 
  straight, 
  bearing 
  on 
  the 
  margin 
  a 
  series 
  of 
  

   serrations 
  fitting 
  into 
  those 
  of 
  the 
  opposite 
  valve. 
  Muscular 
  

   impressions 
  rather 
  small, 
  cordate, 
  radially 
  striated 
  (?), 
  bounded 
  

   by 
  raised 
  margins 
  and 
  divided 
  by 
  a 
  median 
  ridge. 
  Pallial 
  region 
  

   strongly 
  papillose 
  within. 
  Surface 
  covered 
  with 
  very 
  numerous 
  

   fine 
  rays, 
  between 
  each 
  of 
  which 
  there 
  appear 
  to 
  have 
  been 
  possibly 
  

   several 
  still 
  finer. 
  

  

  EemarJcs. 
  With 
  its 
  serrated 
  hinge 
  and 
  probably 
  double 
  system 
  of 
  

   strise 
  this 
  shell 
  seems 
  akin 
  to 
  Stropheodonta 
  (Leptosna) 
  inter 
  strialis, 
  

   Phillips, 
  sp., 
  3 
  but 
  may, 
  I 
  think, 
  be 
  distinguished 
  by 
  its 
  greater 
  size, 
  

   less 
  transverseness, 
  etc. 
  Where 
  so 
  few 
  characters 
  are 
  seen 
  it 
  is 
  

   difficult 
  to 
  point 
  out 
  distinctions, 
  but 
  the 
  general 
  impression 
  which 
  

   it 
  conveys 
  seems 
  different 
  from 
  that 
  of 
  Lummaton 
  examples 
  of 
  

   Phillips's 
  shell. 
  From 
  the 
  Lower 
  Devonian 
  (Daleiden) 
  fossils, 
  

   however, 
  figured 
  by 
  Schnur 
  4 
  under 
  the 
  same 
  name, 
  it 
  does 
  not 
  seem 
  

   separable. 
  Strophomena 
  tceniolata, 
  Sandberger, 
  5 
  from 
  the 
  Spiriferen- 
  

   sandstein 
  of 
  Daleiden, 
  etc., 
  seems 
  also 
  almost 
  exactly 
  alike, 
  his 
  

   figures 
  differing 
  only 
  in 
  being 
  slightly 
  longer 
  and 
  in 
  having 
  rather 
  

   large 
  muscle-scars. 
  With 
  this 
  shell 
  Sandberger 
  unites 
  St. 
  Phillipsii, 
  

   Barrande 
  6 
  (which 
  Barrande 
  compares 
  with 
  St. 
  inter 
  strialis), 
  but 
  

   in 
  it 
  the 
  serrations 
  on 
  the 
  hinge 
  are 
  much 
  finer 
  and 
  the 
  shape 
  

   more 
  spherical. 
  St. 
  imbrex, 
  Pander, 
  7 
  differs 
  internally, 
  while 
  

   St. 
  euglypha, 
  Sowerby, 
  8 
  has 
  the 
  ventral 
  valve 
  concave 
  instead 
  of 
  

   convex. 
  

  

  Strophomena 
  (Stropheodonta?) 
  explanata 
  (Sowerbv) 
  ? 
  (PI. 
  

   XXXI. 
  figs. 
  11-13, 
  & 
  PI. 
  XXXII. 
  figs. 
  1-3.) 
  

  

  Locality. 
  Treborough. 
  Numerous 
  specimens. 
  

  

  Size. 
  One 
  specimen 
  (elongated) 
  is 
  80 
  mm. 
  long 
  by 
  60 
  mm. 
  

   wide 
  ; 
  another 
  (widened) 
  is 
  50 
  mm. 
  long 
  by 
  100 
  mm. 
  wide. 
  

  

  Description. 
  Yery 
  large, 
  apparently 
  nearly 
  flat, 
  perhaps 
  rather 
  

   longer 
  than 
  wide. 
  Umbo 
  slightly 
  produced. 
  Hinge-line 
  as 
  long 
  

  

  1 
  1844. 
  F. 
  Komer, 
  ' 
  Ehein. 
  Uebergangsgeb.' 
  p. 
  65 
  & 
  pi. 
  i. 
  fig. 
  7. 
  

  

  2 
  1834. 
  Von 
  Buch, 
  « 
  Ueber 
  Terebrat.' 
  p. 
  37 
  & 
  pL 
  ii 
  fig. 
  30 
  a-c. 
  

  

  3 
  1841. 
  Phillips, 
  ' 
  Pal. 
  Foss.' 
  p. 
  61 
  & 
  pi. 
  xxv. 
  fig. 
  103. 
  

  

  4 
  1853. 
  Schnur, 
  ' 
  Eifel 
  Brach.' 
  p. 
  222 
  & 
  pi. 
  xli. 
  figs. 
  2 
  a-/. 
  

  

  f 
  5 
  1856. 
  Sandberger, 
  ' 
  Verst. 
  Bhein. 
  Nassau,' 
  p. 
  360 
  & 
  pi. 
  xxxiv. 
  figs. 
  11-11 
  c, 
  . 
  

   Etage 
  F. 
  

  

  6 
  1847. 
  Barrande, 
  < 
  Naturw. 
  Abhandl.' 
  vol. 
  ii. 
  p. 
  226, 
  pi. 
  xxi. 
  figs. 
  10-11. 
  

  

  7 
  1871. 
  Davidson, 
  '• 
  Brit. 
  Foss. 
  Brach.' 
  vol. 
  iii. 
  p. 
  286 
  & 
  pi. 
  xli. 
  figs. 
  1-6. 
  

  

  8 
  1871. 
  Ibid. 
  p. 
  288 
  & 
  pi. 
  xl. 
  figs. 
  1-5. 
  

  

  