﻿448 
  REV. 
  G. 
  E. 
  WHIDBORNE 
  — 
  DESCRIPTION 
  OF 
  THE 
  [Aug. 
  1897 
  r 
  

  

  margin, 
  and 
  turning 
  suddenly 
  near 
  the 
  inferior 
  margin 
  become 
  

   sub-parallel 
  to 
  it 
  ; 
  the 
  line 
  through 
  the 
  angles 
  thus 
  produced 
  forms 
  

   a 
  concave 
  curve 
  from 
  the 
  posterio-inferior 
  corner 
  to 
  the 
  limbs. 
  

   Umbo 
  apparently 
  inconspicuous, 
  situate 
  nearly 
  at 
  the 
  antero- 
  

   superior 
  corner. 
  

  

  Remarks. 
  It 
  seems 
  to 
  me 
  by 
  no 
  means 
  certain 
  that 
  this 
  fossil 
  is 
  

   a 
  lamellibranch. 
  It 
  is 
  somewhat 
  like 
  Leaia 
  Leidyi, 
  Hupert 
  Jones,, 
  

   in 
  shape, 
  but 
  has 
  no 
  radiating 
  ridge. 
  The 
  species 
  of 
  Estheria 
  

   described 
  by 
  Rupert 
  Jones 
  are 
  all 
  more 
  oval, 
  and 
  show 
  no 
  sudden 
  

   bend 
  in 
  the 
  striation. 
  On 
  the 
  other 
  hand, 
  while 
  it 
  has 
  a 
  general 
  

   resemblance 
  to 
  Cypricardinia, 
  the 
  posterior 
  slope 
  (occupying 
  § 
  of 
  

   the 
  shell) 
  would 
  be 
  unusually 
  large 
  for 
  that 
  genus, 
  and 
  there 
  are 
  

   no 
  signs 
  of 
  its 
  usual 
  median 
  constriction. 
  The 
  size 
  of 
  the 
  slope 
  

   may, 
  however, 
  have 
  been 
  exaggerated 
  by 
  its 
  compression. 
  

  

  It 
  is 
  a 
  longer 
  and 
  more 
  oblong 
  shell 
  than 
  C. 
  scalaris, 
  Phillips, 
  sp. 
  

  

  Gosseletia 
  ? 
  Kayseri, 
  Freeh 
  ? 
  (PI. 
  XXXI. 
  figs. 
  6 
  & 
  6 
  a.) 
  

  

  Locality. 
  Treborough. 
  One 
  specimen. 
  

  

  Size. 
  About 
  25 
  mm. 
  long. 
  

  

  Remarks. 
  This 
  is 
  a 
  very 
  indistinct 
  and 
  enigmatical 
  fossil. 
  It 
  

   consists 
  of 
  a 
  low, 
  convex, 
  transversely 
  ovoid 
  central 
  cast, 
  having 
  

   some 
  grooves 
  at 
  the 
  upper 
  corner 
  of 
  the 
  broad 
  end, 
  and 
  terminated 
  

   by 
  an 
  abrupt 
  deflexion 
  at 
  the 
  narrow 
  end. 
  It 
  is 
  bounded 
  above 
  by 
  a 
  

   sharp 
  impressed 
  straight 
  line, 
  beyond 
  which 
  is 
  a 
  narrow 
  border, 
  

   bearing 
  numerous 
  obliquely 
  horizontal 
  striae, 
  which 
  vanish 
  toward 
  

   the 
  broad 
  end 
  of 
  the 
  fossil. 
  

  

  Its 
  nature 
  is 
  very 
  doubtful; 
  but 
  a 
  comparison 
  of 
  Gosseletia 
  

   devonica, 
  1 
  Barrois, 
  and 
  Myalina 
  lodanensis, 
  Freeh, 
  2 
  suggests 
  a 
  

   relationship, 
  while 
  Freeh's 
  3 
  and 
  especially 
  Kayser's 
  4 
  figures 
  of 
  the 
  

   Lower 
  Devonian 
  G. 
  Kayseri 
  render 
  it 
  not 
  impossible 
  that 
  it 
  may 
  be 
  

   a 
  small 
  specimen 
  of 
  that 
  species. 
  

  

  Grammysia 
  ? 
  sp. 
  (PI. 
  XXXI. 
  figs. 
  7-9.) 
  

  

  Locality. 
  Treborough. 
  Two 
  specimens. 
  

  

  Size. 
  A 
  crushed 
  and 
  imperfect 
  specimen 
  is 
  14 
  mm. 
  high 
  by 
  32 
  long. 
  

   Remarks. 
  Of 
  these 
  fossils 
  it 
  can 
  only 
  be 
  said 
  that 
  they 
  seem 
  

   transversely 
  oval, 
  very 
  oblique 
  bivalves, 
  apparently 
  with 
  small 
  

   umbones 
  and 
  strongly 
  curved 
  lateral 
  margins, 
  and 
  covered 
  with 
  

   about 
  12 
  rather 
  irregular 
  growth-lines, 
  which 
  seem 
  to 
  vanish 
  on 
  the 
  

   posterior 
  slope. 
  They 
  may 
  possibly 
  belong 
  to 
  Grammysia, 
  but 
  

   there 
  is 
  nothing 
  to 
  prove 
  that 
  they 
  do 
  so, 
  and 
  it 
  must 
  be 
  distinctly 
  

   understood 
  that 
  they 
  are 
  at 
  present 
  only 
  doubtfully 
  and 
  provision- 
  

   ally 
  placed 
  under 
  this 
  heading 
  for 
  convenience. 
  

  

  1 
  1882. 
  Barrois, 
  Mem. 
  Soc. 
  Geol. 
  Nord, 
  vol. 
  ii. 
  p. 
  274, 
  pi. 
  xii. 
  figs. 
  1-1^. 
  

  

  2 
  1891. 
  Freeh, 
  Abh. 
  geol. 
  Specialk. 
  Preuss. 
  vol. 
  ix. 
  pt. 
  iii. 
  p. 
  158 
  & 
  pi. 
  xv^ 
  

   figs. 
  1-2 
  a. 
  

  

  3 
  Ibid. 
  p. 
  126 
  & 
  pi. 
  xiii. 
  figs. 
  1-3. 
  

  

  4 
  1889. 
  Kayser, 
  Abh. 
  k. 
  Preuss. 
  geol. 
  Landesanst., 
  n. 
  s., 
  pt. 
  i. 
  p. 
  18 
  & 
  pi. 
  viii. 
  

   fig. 
  6. 
  

  

  