﻿SALTER 
  BUDLEIGH 
  SALTERTON 
  FOSSILS. 
  301 
  

  

  area 
  much 
  arched, 
  furnished 
  with 
  four 
  or 
  five 
  oblique 
  teeth, 
  which 
  

   are 
  all 
  in 
  the 
  same 
  direction 
  ; 
  hence 
  the 
  name. 
  There 
  are 
  three 
  

   distinct 
  and 
  very 
  oblique 
  nearly 
  transverse 
  teeth 
  in 
  front 
  of 
  the 
  

   beak, 
  and 
  behind 
  it 
  one 
  long 
  cardinal 
  tooth 
  in 
  each 
  valve, 
  as 
  indi- 
  

   cated 
  by 
  the 
  cast. 
  This 
  long 
  tooth 
  reaches 
  to 
  the 
  extremity 
  of 
  the 
  

   arched 
  hinge-line, 
  and 
  is 
  quite 
  parallel 
  to 
  the 
  margin. 
  The 
  others 
  

   radiate 
  more 
  or 
  less, 
  not 
  from 
  the 
  beak 
  outwards 
  (as 
  in 
  the 
  

   Lyrodesma, 
  just 
  described) 
  but 
  from 
  the 
  lower 
  edge 
  of 
  the 
  hinge 
  - 
  

   plate 
  ; 
  the 
  muscular 
  scar 
  in 
  front 
  is 
  large 
  and 
  round, 
  the 
  hinder 
  one 
  

   elongated. 
  

  

  The 
  subtrigonal 
  shape 
  distinguishes 
  this 
  easily 
  from 
  all 
  the 
  Cana- 
  

   dian 
  species 
  (Geol. 
  Canada, 
  1863, 
  p. 
  147, 
  &c). 
  None 
  of 
  the 
  British 
  

   species 
  have 
  so 
  narrow 
  and 
  pointed 
  a 
  posterior 
  end. 
  

  

  y 
  ^\Z. 
  Ctenodonta 
  Bertrandi, 
  Kouault, 
  sp. 
  PI. 
  XY. 
  fig. 
  8. 
  

  

  Nucula 
  Bertrandi, 
  Rouault, 
  Bull. 
  Soc. 
  Geol. 
  Fr. 
  2nd 
  ser. 
  vol. 
  iv. 
  

   1846-47, 
  p. 
  322. 
  

  

  I 
  do 
  not 
  feel 
  certain 
  of 
  this 
  identification, 
  but 
  M. 
  de 
  Yerneuil, 
  in 
  

   his 
  letter 
  to 
  me, 
  admits 
  it. 
  

  

  ^14. 
  Solen 
  ? 
  (or 
  some 
  allied 
  genus). 
  PI. 
  XYI. 
  fig. 
  11. 
  

  

  There 
  are, 
  besides 
  the 
  above, 
  a 
  Strophomena 
  somewhat 
  allied 
  to 
  

   S. 
  comjpressa, 
  ' 
  Sil. 
  Syst.,' 
  and 
  of 
  about 
  the 
  same 
  size, 
  plano-convex 
  

   in 
  form 
  ; 
  two 
  species 
  of 
  Bellerophon 
  ; 
  an 
  Orihoceras 
  with 
  close 
  septa 
  

   and 
  a 
  nearly 
  lateral 
  siphon, 
  and 
  one 
  or 
  two 
  other 
  smooth 
  species 
  of 
  

   the 
  same 
  genus 
  ; 
  and 
  several 
  undescribed 
  Lamellibranchiata, 
  which 
  

   must 
  await 
  illustration 
  at 
  some 
  future 
  opportunity. 
  

  

  EXPLANATION 
  OF 
  PLATES 
  XY, 
  XVI., 
  XVII. 
  

  

  Illustrative 
  of 
  Fossils 
  from 
  Budleigh 
  Salterton. 
  

  

  Plate 
  XV. 
  

  

  Fig. 
  1. 
  Homalonotus 
  Brongniarti, 
  Deslongchamps, 
  sp. 
  : 
  a, 
  glabella 
  and 
  fixed 
  

   cheeks; 
  b, 
  free 
  cheek 
  ; 
  c, 
  thorax-joint 
  ; 
  d, 
  tail, 
  showing 
  serrate 
  margin. 
  

  

  2. 
  H. 
  Brongniarti, 
  var. 
  with 
  somewhat 
  squarer 
  outline 
  to 
  head. 
  

  

  3. 
  Homalonotus, 
  sp. 
  not 
  yet 
  described 
  in 
  France 
  or 
  England. 
  

  

  4. 
  Phacops 
  incertus, 
  Deslongch., 
  sp. 
  : 
  a, 
  interior 
  cast 
  of 
  head 
  ; 
  b, 
  exterior 
  

  

  mould, 
  in 
  gutta-percha, 
  of 
  the 
  tail-piece. 
  

  

  5. 
  Calymene 
  Tristani, 
  Brongn. 
  Interior 
  cast 
  of 
  tail. 
  

  

  6. 
  Pseudaxinus 
  trigonus, 
  Salter. 
  Two 
  views 
  of 
  an 
  interior 
  cast 
  of 
  the 
  right 
  

  

  valve 
  of 
  a 
  thin 
  shell. 
  

  

  7. 
  Hippomya 
  ringens, 
  Salter 
  : 
  a, 
  dorsal 
  view 
  ; 
  b, 
  ventral 
  view, 
  showing 
  the 
  

  

  passage 
  for 
  the 
  huge 
  byssus. 
  

  

  8. 
  Ctenodonta 
  Bertrandi, 
  Kouault 
  : 
  a, 
  interior 
  of 
  right 
  valve 
  ; 
  b, 
  magnified 
  

  

  surface. 
  

  

  9. 
  Trachyderma 
  serrata, 
  Salter 
  : 
  a 
  shows 
  the 
  projecting 
  squamose 
  ridges 
  of 
  

  

  the 
  tube 
  ; 
  b 
  is 
  a 
  rough 
  interior 
  cast. 
  

  

  Plate 
  XVI. 
  

  

  Fig. 
  1. 
  Modiolopsis 
  Armorici, 
  spec. 
  nov. 
  : 
  a, 
  cast 
  of 
  interior, 
  right 
  valve 
  ; 
  b, 
  dor- 
  

   sal 
  view 
  of 
  broken 
  pair 
  of 
  valves. 
  

   2. 
  Modiolopsis, 
  sp. 
  : 
  cast 
  of 
  left 
  valve, 
  and 
  edge-view 
  of 
  ditto. 
  

  

  