﻿REV. 
  W. 
  DOWNES 
  ON 
  THE 
  BLACKDOWN 
  BEDS. 
  91 
  

  

  tatus 
  and 
  Trigonia 
  dcedalea 
  occur 
  down 
  to 
  the 
  very 
  base 
  of 
  the 
  

   series 
  at 
  Haldon 
  ; 
  and 
  the 
  agreement 
  is 
  further 
  confirmed 
  litholo- 
  

   gically 
  by 
  the 
  chert-bands 
  and 
  the 
  fragments 
  of 
  fossils 
  covered 
  with 
  

   concentric 
  rings 
  of 
  chalcedony. 
  I 
  think 
  that 
  beds 
  10 
  and 
  11 
  of 
  

   Blackdown 
  must 
  be 
  represented 
  at 
  Haldon, 
  though 
  I 
  failed 
  to 
  

   identify 
  them 
  in 
  situ. 
  Some 
  of 
  Mr. 
  Vicary's 
  specimens 
  exactly 
  

   agree 
  with 
  bed 
  10 
  of 
  Blackdown, 
  both 
  in 
  the 
  fossils 
  and 
  in 
  their 
  mode 
  

   of 
  occurrence. 
  I 
  infer 
  therefore 
  the 
  presence 
  of 
  beds 
  10 
  and 
  11. 
  

   Probably 
  they 
  are 
  thin, 
  and 
  possibly 
  only 
  local 
  ; 
  while 
  the 
  surface- 
  

   slippage 
  of 
  bed 
  12 
  would 
  quite 
  account 
  for 
  the 
  fact 
  that 
  they 
  are 
  

   not 
  easily 
  to 
  be 
  found*. 
  The 
  stream-sections 
  also 
  are 
  greatly 
  marked 
  

   by 
  debris, 
  and 
  the 
  few 
  clean-cut 
  sections 
  which 
  exist 
  exhibit 
  gene- 
  

   rally 
  only 
  the 
  upper 
  portions 
  of 
  the 
  series. 
  The 
  only 
  complete 
  

   section 
  that 
  I 
  know 
  of 
  is 
  that 
  at 
  Smallacombe 
  Goyle, 
  on 
  Little 
  Hal- 
  

   don, 
  and 
  this 
  is 
  partly 
  a 
  stream-section. 
  These 
  two 
  distinct 
  beds 
  

   beneath 
  bed 
  12 
  were 
  seen 
  by 
  Mr. 
  Champernowne 
  and 
  by 
  myself; 
  

   but 
  we 
  found 
  no 
  fossils 
  in 
  them. 
  

  

  Turning 
  then, 
  lastly, 
  to 
  the 
  higher 
  beds 
  at 
  Haldon, 
  we 
  find 
  a 
  thin 
  

   band 
  containing 
  a 
  distinct 
  and 
  all 
  but 
  unique 
  fauna. 
  

  

  In 
  this 
  are 
  several 
  species 
  of 
  Annelids, 
  but 
  the 
  main 
  feature 
  in 
  the 
  

   fauna 
  is 
  the 
  Corals. 
  Professor 
  Duncan 
  enumerates 
  the 
  following 
  : 
  — 
  

  

  Peplosmilia 
  Austeni 
  (Ed. 
  8f 
  H.). 
  

   Placosmilia 
  cuneiformis 
  (Ed. 
  § 
  H.). 
  

  

  Parkinsoni 
  (Ed. 
  $ 
  R.). 
  

  

  magnifica 
  (Duncan). 
  

  

  depressa 
  (E. 
  de 
  From.). 
  

  

  Cyathophora 
  monticularia 
  (d'Orb.). 
  

  

  Favia 
  minutissima 
  (Duncan). 
  

  

  Troohosmilia 
  varians 
  (Beuss). 
  

  

  Thamnastrasa 
  belgica 
  (Ed. 
  <$r 
  H.). 
  

  

  Haldonia 
  Yicaryi, 
  sp. 
  nov. 
  ^ 
  

  

  Stellaria 
  incrustans, 
  sp. 
  nov. 
  \ 
  

  

  Baryhelia 
  reticulata, 
  sp. 
  nov. 
  From 
  Mr 
  VicarVs 
  

  

  Thamnastrsea 
  Eamsayi, 
  sp. 
  nov. 
  | 
  g^^ens 
  

  

  Actinacis 
  stellulata, 
  sp. 
  nov. 
  ^ 
  O 
  T 
  T 
  S 
  "F 
  b 
  18*79 
  

  

  insignia, 
  sp. 
  nov. 
  ^' 
  

  

  Trochoseris 
  constricta, 
  sp. 
  nov. 
  

  

  Morrisi, 
  sp. 
  nov. 
  

  

  Heliopora 
  cserulea 
  ( 
  Grimm.). 
  j 
  

  

  Sinilotrochus 
  Austeni 
  (E. 
  fy 
  H.) 
  is 
  also 
  in 
  Mr. 
  Vicary's 
  collection. 
  

  

  Speaking 
  of 
  Heliopora 
  ccerulea 
  (Grimm.), 
  Prof. 
  Duncan 
  remarks 
  

   that 
  this 
  fossil 
  from 
  Haldon 
  cannot 
  be 
  distinguished 
  from 
  the 
  

   in 
  crusting 
  recent 
  form. 
  

  

  Of 
  Polyzoa 
  there 
  are 
  many, 
  but 
  I 
  am 
  not 
  aware 
  that 
  they 
  are 
  

   anywhere 
  described. 
  

  

  Brachiopoda. 
  — 
  I 
  have 
  seen 
  two 
  species 
  of 
  Rhynchonella 
  from 
  this 
  

   bed. 
  One 
  of 
  Mr. 
  Vicary's 
  is 
  labelled 
  R. 
  Cuvieri. 
  

  

  Of 
  Lamellibrancliiata 
  there 
  are 
  several. 
  Fragments 
  of 
  Ostrea 
  and 
  

  

  * 
  The 
  terminal 
  slippage 
  of 
  the 
  higher 
  beds 
  over 
  the 
  lower 
  ones 
  is 
  very 
  

   general 
  at 
  Blackdown. 
  The 
  pits 
  thus 
  often 
  traverse 
  fossiliferous 
  beds 
  at 
  the 
  

   entrance, 
  and 
  afterwards 
  pass 
  under 
  them. 
  

  

  pi. 
  viii. 
  figs. 
  1-18. 
  

  

  