﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  1 
  63 
  

  

  Stonebarrow 
  Hill, 
  and 
  Westhay 
  Cliff, 
  the 
  grand 
  exhibition 
  at 
  Golden 
  

   Cap, 
  and 
  the 
  Middle 
  and 
  Upper 
  Lias 
  of 
  Down 
  Cliffs, 
  are 
  all 
  delineated 
  

   by 
  Mr. 
  Day 
  in 
  trne 
  dip 
  succession. 
  He' 
  enumerates 
  13 
  genera 
  and 
  

   15 
  species 
  of 
  Monomyaria, 
  and 
  30 
  genera 
  and 
  35 
  species 
  of 
  Dim) 
  - 
  

   aria, 
  from 
  the 
  middle 
  division 
  of 
  the 
  Lias, 
  along 
  the 
  Dorsetshire 
  

   coast. 
  From 
  the 
  so-called 
  " 
  Belemnite-beds," 
  persistent 
  in 
  all 
  the 
  

   above-named 
  cliffs, 
  Mr. 
  Day 
  obtained 
  evidence 
  of 
  the 
  occurrence 
  

   of 
  38 
  species 
  — 
  amongst 
  them 
  9 
  species 
  of 
  Ammonites, 
  the 
  dominant 
  

   species 
  being 
  JEgoceras 
  Henleyi, 
  JE. 
  Bechei, 
  Phylloceras 
  Losco7nbii, 
  

   and 
  Lytoceras 
  fimbriatum 
  ; 
  5 
  species 
  of 
  Belemnites, 
  and 
  the 
  remark- 
  

   able 
  Xiphoteuthis 
  elongate, 
  noticed 
  by 
  De 
  la 
  Beche 
  thirty-six 
  years 
  

   before 
  ; 
  2 
  species 
  of 
  Nautili, 
  and 
  2 
  Ichthyosauri, 
  /. 
  communis 
  and 
  1. 
  

   tenuirostris. 
  The 
  remaining 
  19 
  forms 
  are 
  chiefly 
  Lamellibranchiata. 
  

   The 
  locally 
  so-called 
  Green 
  Ammonite 
  beds 
  containing 
  Am. 
  lati- 
  

   costatus, 
  Sow., 
  with 
  Phylloceras 
  Loscombi, 
  Am. 
  heterogenus, 
  and 
  

   JEgoceras 
  Davcei, 
  are 
  a 
  marked 
  feature 
  in 
  all 
  the 
  sections. 
  These 
  beds 
  

   have 
  yielded 
  16 
  species, 
  9 
  of 
  them 
  Cephalopoda, 
  4 
  Gasteropoda, 
  arid 
  

   2 
  Saurians 
  ; 
  only 
  1 
  Lamellibranch 
  has 
  occurred. 
  Beds 
  called 
  the 
  

   " 
  Three 
  Tiers 
  " 
  conspicuously 
  mark 
  a 
  special 
  horizon 
  in 
  the 
  

   cliffs 
  at 
  Westhay 
  and 
  Golden 
  Cap, 
  surmounted 
  by 
  the 
  " 
  Shell- 
  

   bed," 
  so 
  called 
  from 
  its 
  rich 
  assemblage 
  of 
  Conchifera, 
  about 
  30 
  

   species 
  occurring. 
  Besting 
  upon 
  this 
  thin 
  yet 
  prolific 
  Shell-bed 
  is 
  

   the 
  well-known 
  " 
  Starfish-bed," 
  containing 
  Ophioderma 
  Egertoni 
  

   and 
  its 
  var. 
  0. 
  tenuibranchiata 
  : 
  this 
  bed 
  forms 
  a 
  remarkable 
  feature 
  

   in 
  the 
  grand 
  face 
  of 
  the 
  cliffs 
  at 
  Golden 
  Cap. 
  The 
  fauna 
  of 
  the 
  

   succeeding 
  Middle 
  Lias 
  sands 
  is 
  then 
  given 
  by 
  Mr. 
  Day 
  (25 
  species). 
  

   He 
  then 
  notices 
  the 
  single 
  bed 
  of 
  Marlstone 
  above 
  the 
  sands 
  

   with 
  Amaltheus 
  spinatus, 
  which 
  contains 
  no 
  less 
  than 
  94 
  species, 
  

   18 
  Brachiopoda, 
  9 
  species 
  of 
  Monomyaria, 
  23 
  Dimyaria, 
  25 
  Gastero- 
  

   poda, 
  8 
  species 
  of 
  Ammonites, 
  with 
  Belemnites, 
  Echinodermata, 
  

   Annelida, 
  &c. 
  The 
  dying-out 
  of 
  the 
  Middle 
  Lias 
  here, 
  and 
  the 
  

   commencement 
  of 
  the 
  Upper 
  Lias, 
  result 
  in 
  the 
  appearance 
  of 
  

   5 
  well-known 
  Upper-Lias 
  Ammonites, 
  Stephanoceras 
  crassum, 
  

   Harpoceras 
  serpentinum, 
  Stephanoceras 
  commune, 
  S. 
  Holandrei, 
  

   and 
  Harpoceras 
  radians. 
  The 
  same 
  thing 
  occurs 
  in 
  Rutlandshire, 
  at 
  

   Edmondthorpe 
  and 
  "Wymondham, 
  as 
  stated 
  by 
  Professor 
  Judd 
  in 
  

   his 
  memoir, 
  p. 
  71. 
  Mr. 
  Day, 
  in 
  his 
  endeavour 
  to 
  account 
  for 
  this 
  

   abnormal 
  condition, 
  says 
  : 
  — 
  " 
  Nor 
  is 
  this 
  bed, 
  so 
  valuable 
  in 
  the 
  

   abundance 
  of 
  its 
  palaeontological 
  evidence, 
  less 
  suggestive 
  of 
  physical 
  

   facts. 
  This 
  thin 
  and 
  interrupted 
  bed, 
  which 
  I 
  consider 
  to 
  be 
  the 
  

   representative 
  of 
  the 
  Marlstone, 
  the 
  pebbles 
  and 
  small 
  boulders 
  

   imbedded 
  therein, 
  the 
  perforations 
  of 
  i:h.e 
  Lithodomi, 
  the 
  masses 
  of 
  

   shells 
  here 
  and 
  there 
  collected 
  into 
  hollows, 
  as 
  it 
  were, 
  of 
  the 
  

   underlying 
  rock, 
  the 
  Serpulce 
  covering 
  the 
  shells 
  and 
  pebbles, 
  and 
  

   the 
  very 
  intermixture 
  of 
  Upper-Lias 
  species, 
  all 
  point 
  to 
  a 
  sea- 
  

   bottom 
  upon 
  which 
  for 
  a 
  long 
  period, 
  little 
  or 
  no 
  deposit 
  took 
  place, 
  

   the 
  waterworn 
  fragments 
  which 
  lie 
  upon 
  it, 
  on 
  the 
  contrary, 
  indi- 
  

   cating 
  that, 
  during 
  that 
  period, 
  previously 
  formed 
  strata 
  were 
  again 
  

   destroyed. 
  From 
  what 
  I 
  have 
  seen 
  of 
  the 
  junction 
  of 
  the 
  Middle 
  

   with 
  the 
  Upper 
  Lias, 
  both 
  here 
  and 
  at 
  Glastonbury 
  in 
  Somerset- 
  

  

  n2 
  

  

  