﻿298 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  ^ 
  3. 
  Modiolopsis, 
  sp. 
  PI. 
  XVI. 
  fig. 
  2. 
  

  

  Clearly 
  distinct 
  by 
  its 
  subquadrate 
  form, 
  but 
  not 
  perfect 
  enough 
  

   to 
  require 
  a 
  name. 
  It 
  is 
  nearest 
  to 
  M. 
  Armorici. 
  

  

  >S 
  4. 
  MoDioLorsis 
  obliquus, 
  spec. 
  nov. 
  PI. 
  XVI. 
  fig. 
  3 
  (and 
  3c, 
  young). 
  

  

  Trapezoidal, 
  the 
  anterior 
  side 
  a 
  little 
  produced 
  and 
  narrow, 
  the 
  

   posterior 
  broad 
  and 
  expanded, 
  the 
  posterior 
  angle 
  rounded. 
  Beaks 
  

   compressed, 
  close, 
  placed 
  at 
  the 
  anterior 
  third 
  ; 
  the 
  umbonal 
  ridge 
  

   distinct, 
  prominent, 
  rounded 
  ; 
  the 
  posterior 
  slope 
  somewhat 
  flattened, 
  

   the 
  anterior 
  much 
  so, 
  and 
  with 
  a 
  slight 
  marginal 
  sinus, 
  not 
  forming 
  

   a 
  lobe. 
  Lines 
  of 
  growth 
  conspicuous, 
  becoming 
  irregular 
  wrinkles 
  

   over 
  the 
  anterior 
  slope. 
  Anterior 
  muscular 
  scar 
  large, 
  not 
  deep, 
  

   placed 
  high 
  up 
  towards 
  the 
  beak 
  ; 
  ligamental 
  ridge 
  well 
  defined, 
  but 
  

   not 
  prominent. 
  

  

  The 
  young 
  shell 
  (fig. 
  3 
  c) 
  shows 
  the 
  marginal 
  sinus 
  even 
  more 
  

   distinctly 
  than 
  the 
  old, 
  and 
  was 
  at 
  first 
  taken 
  for 
  a 
  distinct 
  species. 
  

   I 
  do 
  not 
  know 
  that 
  this 
  form 
  occurs 
  in 
  France. 
  

  

  5. 
  Modiolopsis 
  lingualis, 
  sp. 
  nov. 
  PL 
  XVI. 
  fig. 
  5. 
  

  

  A 
  small 
  species, 
  easily 
  distinguished 
  from 
  the 
  above 
  by 
  the 
  fol- 
  

   lowing 
  characters. 
  

  

  The 
  length 
  is 
  three-quarters 
  of 
  an 
  inch 
  ; 
  the 
  breadth 
  posteriorly 
  

   half 
  an 
  inch, 
  beneath 
  the 
  beak 
  hardly 
  more 
  than 
  quarter 
  of 
  an 
  inch 
  ; 
  

   the 
  depth 
  of 
  the 
  valve 
  slight. 
  The 
  beak 
  is 
  placed 
  far 
  forwards, 
  the 
  

   posterior 
  slope 
  convex; 
  a 
  distinct 
  sinus 
  separates 
  this, 
  behind 
  the 
  

   anterior 
  third, 
  from 
  the 
  rather 
  flattened 
  anterior 
  slope. 
  The 
  poste- 
  

   rior 
  margin 
  is 
  much 
  rounded. 
  The 
  surface 
  smooth, 
  except 
  a 
  few 
  

   ridges 
  of 
  growth, 
  most 
  visible 
  on 
  the 
  anterior 
  portion. 
  

  

  It 
  may 
  be 
  compared 
  with 
  such 
  species 
  as 
  the 
  M. 
  eccpansa, 
  Portlock, 
  

   or 
  the 
  M. 
  modiolaris, 
  M-'Coy 
  (Siluria, 
  2nd 
  edit. 
  p. 
  213), 
  but 
  is 
  quite 
  

   distinct. 
  

  

  XG. 
  Clidophokus? 
  amygdalus, 
  spec. 
  nov. 
  PL 
  XVI. 
  fig. 
  6. 
  

  

  Sixteen 
  lines 
  long 
  by 
  8-J- 
  high, 
  the 
  depth 
  of 
  the 
  united 
  valves 
  

   being 
  fully 
  half 
  an 
  inch. 
  Transverse 
  oval- 
  oblong, 
  gibbous 
  ; 
  the 
  beaks 
  

   depressed, 
  closely 
  approximate, 
  and 
  very 
  near 
  the 
  small 
  rounded 
  

   anterior 
  end, 
  which 
  has 
  a 
  strong 
  circular 
  muscular 
  scar. 
  A 
  strong 
  

   diagonal 
  rounded 
  ridge 
  runs 
  from 
  the 
  low 
  beak 
  to 
  the 
  rounded 
  pos- 
  

   terior 
  margin. 
  The 
  disk 
  convex, 
  the 
  posterior 
  slope 
  only 
  slightly 
  

   flattened. 
  Surface 
  concentrically 
  striate. 
  

  

  The 
  hinge 
  has 
  the 
  subcardinal 
  ligamental 
  posterior 
  ridge 
  short 
  and 
  

   slight, 
  and 
  anteriorly 
  shows 
  a 
  pair 
  of 
  divergent 
  teeth. 
  The 
  genus 
  is 
  

   doubtful. 
  The 
  affinity 
  of 
  Clidophorus 
  with 
  the 
  Arcadce 
  is 
  not 
  yet 
  

   settled, 
  but 
  there 
  is 
  a 
  good 
  deal 
  of 
  resemblance, 
  in 
  the 
  species 
  here 
  

   described, 
  to 
  such 
  forms 
  as 
  Redonia. 
  This 
  form 
  occurs 
  in 
  the 
  Caen 
  

   Sandstone 
  (De 
  Verneuil). 
  

  

  Pseud 
  axinus, 
  gen. 
  nov. 
  

   We 
  have 
  for 
  some 
  time 
  wanted 
  a 
  name 
  under 
  which 
  to 
  include 
  a 
  

  

  