﻿EEV. 
  W. 
  DOWKES 
  ON 
  THE 
  BLACKDOWN 
  BEDS. 
  87 
  

  

  Lamellibranchiata. 
  

  

  *Ostrea 
  frons 
  (Park.). 
  J, 
  B, 
  D. 
  Bed 
  12. 
  

  

  macroptera 
  (Sow.). 
  B. 
  

  

  ?sp. 
  E. 
  CE. 
  

  

  #Exogyra 
  conica 
  (Sow.). 
  Common. 
  Beds 
  7-12. 
  

  

  undata 
  (Sow.). 
  B, 
  OE. 
  

  

  # 
  plicata 
  (Lam.). 
  J, 
  E. 
  

  

  Anomia 
  ? 
  OE. 
  

  

  Hinnites, 
  sp. 
  J. 
  

   *Pecten 
  Milleri 
  (Sow.). 
  Bed 
  10. 
  Common. 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  19. 
  

  

  * 
  quadricostatus, 
  Sow. 
  Common. 
  Characteristic 
  of 
  bed 
  12, 
  beneath 
  which 
  

  

  it 
  is 
  never 
  found. 
  

   * 
  quinquecostatus 
  (Sow.). 
  J, 
  B, 
  E. 
  

  

  Stutchburyanus 
  (Sow.). 
  B. 
  

  

  orbicularis 
  (Sow.). 
  B. 
  

  

  ? 
  sp. 
  B. 
  

  

  ttLima 
  semisulcata 
  (Sow.). 
  Common. 
  Beds 
  14-16. 
  

  

  morenna? 
  (d'Orb.). 
  V. 
  

  

  Plicatula 
  ? 
  CE, 
  M. 
  

  

  Avicula 
  lanceolata 
  (Forbes). 
  CE, 
  V. 
  

  

  pectinata, 
  Sow. 
  M. 
  

  

  Bauliniana, 
  d' 
  Orb. 
  M. 
  

  

  # 
  anomala 
  (Sow.). 
  J, 
  B, 
  V. 
  CE. 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  18. 
  

  

  xG-ervillia 
  anceps 
  (Desk.). 
  Common. 
  Beds 
  4—10. 
  

  

  solenoides 
  (Def.). 
  J. 
  

  

  # 
  rostrata 
  (Sow.). 
  Common. 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  17. 
  

  

  Inoceramus 
  concentricus 
  (Park). 
  Common. 
  Beds 
  8-10. 
  

  

  sulcatus 
  (Park.). 
  Beds 
  4—10, 
  but 
  especially 
  5-6. 
  

  

  Pinna 
  tetragona 
  (Sow.). 
  J, 
  B, 
  W, 
  CE. 
  

  

  Mytilus 
  striatocostatus 
  (dOrb.). 
  J, 
  CE. 
  

   # 
  tridens 
  (Sow.). 
  Common. 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  14. 
  Bed 
  10. 
  

  

  praelongus 
  (Sow.). 
  B, 
  CE. 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  15. 
  

  

  inaequivalvis 
  (Sow.). 
  B. 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  16. 
  

  

  Modiola 
  gequalis 
  (Sow.). 
  J. 
  

  

  lygeriensis 
  ( 
  ? 
  Sow.). 
  J. 
  

  

  # 
  reversa 
  (Sow.). 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  13. 
  

  

  Area, 
  sp. 
  ? 
  J. 
  

  

  * 
  rotundata 
  (Sow.). 
  B. 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  8. 
  Probably, 
  like 
  the 
  corals, 
  

  

  a 
  trace 
  of 
  bed 
  13. 
  

  

  Limopsis, 
  sp. 
  ? 
  B, 
  W. 
  

   #Cucullsea 
  carinata=costellata 
  (Sow.). 
  Common. 
  Beds 
  8-12, 
  but 
  especially 
  

  

  * 
  fibrosa 
  (Sow.). 
  \ 
  If 
  these 
  are 
  two 
  species, 
  they 
  may 
  be 
  distinguished 
  as 
  

  

  # 
  glabra 
  (Park.). 
  J 
  their 
  name 
  suggests. 
  The 
  one 
  is 
  glabrous 
  and 
  the 
  other 
  

  

  fibrous; 
  but, 
  as 
  Mr. 
  Sowerby 
  remarks 
  (Min. 
  Con. 
  vol. 
  iii. 
  p. 
  9), 
  "the 
  

   smoothness 
  of 
  the 
  surface 
  may 
  arise 
  from 
  wear." 
  Bed 
  10, 
  where, 
  as 
  

   already 
  remarked, 
  the 
  glabrous 
  characteristic 
  may 
  be 
  easily 
  accounted 
  for. 
  

   formosa 
  (Sow.). 
  B. 
  Fitton, 
  pi. 
  xvii. 
  fig. 
  7. 
  

  

  ttPectunculus 
  umbonatus 
  (Sow.). 
  Common. 
  Bed 
  7, 
  and 
  occasionally 
  be- 
  

   neath 
  it. 
  

  

  # 
  subhevis 
  (Sow.)\. 
  Beds 
  11 
  & 
  12. 
  

  

  sp.? 
  J. 
  

  

  t 
  In 
  their 
  descriptions, 
  MM. 
  Briart 
  et 
  Cornet 
  (p. 
  62) 
  appear 
  to 
  have 
  referred 
  

   to 
  P. 
  sublcevis 
  the 
  characteristics 
  of 
  P. 
  umbonatus 
  and 
  vice 
  versa 
  : 
  e. 
  g., 
  describing 
  

   P. 
  sublcevis, 
  the 
  authors 
  say: 
  — 
  " 
  Cette 
  coquille 
  est 
  tres 
  voisine, 
  par 
  sa 
  forme 
  

   generale 
  et 
  ses 
  ornements, 
  de 
  la 
  precedente 
  [P. 
  umbonatus]. 
  Elle 
  s'en 
  distingue 
  

   cependant 
  par 
  sa 
  longueur 
  plus 
  grande, 
  et 
  par 
  son 
  epaisseur 
  beaucoup 
  moindre, 
  

   et 
  par 
  son 
  crochet 
  moins 
  proeminent. 
  Elle 
  a 
  aussi 
  la 
  cote 
  anal 
  tronque, 
  mais 
  

   d'une 
  maniere 
  moins 
  accusee" 
  (Mem. 
  Cour. 
  tome 
  xxxiv. 
  1870, 
  p. 
  62). 
  

  

  