﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  l6l 
  

  

  JEJgoceras 
  angulatum, 
  whose 
  fauna 
  is 
  Hettangian, 
  being 
  identical 
  with 
  

   that 
  of 
  the 
  Gres 
  infraliasique 
  de 
  Hettange, 
  and 
  the 
  Cote-d'Or 
  beds 
  

   containing 
  Ammonites 
  Moreanus 
  inferior 
  to 
  those 
  with 
  Ammonites 
  

   Bucklandi 
  and 
  Lima 
  gigantea. 
  The 
  Bucklandi-beds 
  with 
  the 
  persis- 
  

   tent 
  Ostrea 
  arcuata 
  (Gryphoea 
  incurva) 
  exceed 
  all 
  others; 
  and 
  the 
  

   latter 
  species 
  marks 
  with 
  unerring 
  certainty 
  the 
  above 
  horizon, 
  

   readily 
  distinguishing 
  the 
  Bucklandi- 
  from 
  the 
  Angulatus-series, 
  which 
  

   is 
  equally 
  crowded 
  with 
  Ostrea 
  irregularis. 
  Prof. 
  Tate 
  enumerates 
  

   no 
  less 
  than 
  38 
  species 
  from 
  his 
  zone 
  of 
  Belemnites 
  acutus 
  at 
  Ballin- 
  

   toy, 
  including 
  12 
  species 
  of 
  Dimyaria 
  and 
  7 
  Monomyaria, 
  with 
  9 
  

   Ammonites 
  and 
  2 
  species 
  of 
  Belemnites. 
  

  

  In 
  the 
  same 
  year 
  Mr. 
  Tate 
  critically 
  noticed 
  and 
  discussed 
  the 
  

   " 
  Possiliferous 
  Development 
  of 
  the 
  Zone 
  of 
  Ammonites 
  angulatus 
  

   in 
  Great 
  Britain," 
  giving 
  a 
  copious 
  list 
  of 
  the 
  contents 
  of 
  the 
  zone 
  

   from 
  five 
  localities 
  ; 
  15 
  genera 
  and 
  25 
  species 
  of 
  Dimyaria 
  are 
  given, 
  

   chiefly 
  from 
  Ireland 
  and 
  Marton. 
  • 
  The 
  Monomyaria 
  number 
  8 
  

   genera 
  and 
  22 
  species. 
  The 
  series 
  recorded 
  by 
  Mr. 
  Tate 
  from 
  the 
  

   Angulatus-zone 
  includes 
  100 
  species 
  — 
  78 
  from 
  the 
  Irish 
  beds, 
  46 
  from 
  

   Marton, 
  12 
  from 
  Down-Hatherly, 
  16 
  from 
  Brocastle, 
  and 
  4 
  from 
  Sut- 
  

   ton. 
  30 
  species 
  are 
  common 
  to 
  the 
  Irish 
  and 
  Marton 
  beds. 
  In 
  1870 
  

   Mr. 
  Tate 
  again 
  published 
  an 
  important 
  paper 
  upon 
  the 
  " 
  Palaeon- 
  

   tology 
  of 
  the 
  Junction-beds 
  of 
  the 
  Lower 
  and 
  Middle 
  Lias 
  in 
  

   Gloucestershire" 
  *. 
  He 
  there 
  records 
  50 
  species 
  from 
  the 
  zones 
  of 
  

   Amaliheus 
  oocynotus 
  and 
  Arietites 
  raricostatus, 
  and 
  from 
  the 
  suc- 
  

   ceeding 
  ^Egoceras-Jamesoni 
  beds 
  no 
  less 
  than 
  116 
  species 
  ; 
  60 
  of 
  

   these 
  116 
  pass 
  to 
  higher 
  zones, 
  and 
  14 
  species 
  are 
  common 
  to 
  the 
  

   Lower 
  and 
  Middle 
  Lias 
  of 
  that 
  area. 
  The 
  Dimyaria 
  number 
  16 
  

   genera 
  and 
  27 
  species. 
  Mr. 
  Tate 
  proposed 
  upon 
  faunal 
  grounds 
  to 
  

   draw 
  the 
  line 
  separating 
  the 
  Lower 
  and 
  Middle 
  Lias 
  between 
  the 
  

   zones 
  of 
  Arietites 
  obtusus 
  and 
  Amaliheus 
  oxynotus, 
  thus 
  giving 
  a 
  

   total 
  of 
  164 
  species 
  for 
  the 
  united 
  zone, 
  6 
  passing 
  to 
  the 
  Middle 
  Lias. 
  

  

  The 
  rich 
  beds 
  of 
  the 
  Jamesoni-zone 
  at 
  Penny 
  Compton, 
  rendered 
  

   conspicuous 
  by 
  the 
  fine 
  collection 
  made 
  from 
  them 
  by 
  Mr. 
  T. 
  Beesley, 
  

   P.C.S., 
  of 
  Banbury, 
  have 
  yielded 
  a 
  large 
  Dimyarian 
  fauna 
  : 
  no 
  less 
  

   than 
  19 
  genera 
  and 
  35 
  species 
  are 
  in 
  Mr. 
  Beesley's 
  collection 
  from 
  

   this 
  one 
  horizon 
  and 
  locality 
  alone. 
  

  

  Pew 
  bivalve 
  species 
  occur 
  in 
  the 
  zones 
  of 
  AZgoceras 
  Henleyi 
  and 
  

   Amaliheus 
  ibex. 
  The 
  only 
  good 
  description 
  of 
  the 
  latter 
  zone 
  

   and 
  its 
  contents 
  is 
  due 
  to 
  the 
  researches 
  of 
  Mr. 
  E. 
  B. 
  Tawney, 
  who 
  

   has 
  most 
  carefully 
  and 
  critically 
  examined 
  the 
  species 
  in 
  this 
  zone 
  

   near 
  Radstock, 
  in 
  Somersetshire 
  f 
  . 
  Here 
  the 
  Ibex-beds 
  are 
  associated 
  

   with 
  the 
  Jamesoni-series, 
  and 
  seven 
  or 
  eight 
  species 
  of 
  Ammonites, 
  

   including 
  ^Egoceras 
  brevispina, 
  2E. 
  Jamesoni, 
  and 
  Amaliheus 
  ibex, 
  

   seem 
  to 
  be 
  characteristic 
  here. 
  The 
  Dimyarian 
  fauna 
  of 
  the 
  zone 
  of 
  

   Amaltheus 
  margaritatus 
  in 
  Gloucestershire 
  and 
  Dorsetshire, 
  as 
  con- 
  

   trasted 
  with 
  that 
  of 
  Yorkshire, 
  is 
  not 
  large. 
  Again, 
  in 
  Rutland 
  it 
  

   can 
  be 
  divided 
  into 
  five 
  sections, 
  from 
  the 
  yellowish-brown 
  sandy 
  

  

  * 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxvi. 
  p. 
  394 
  (1870). 
  

  

  t 
  " 
  Notes 
  on 
  the 
  Lias 
  in 
  the 
  Neighbourhood 
  of 
  Eadstock," 
  Proc. 
  Bristol 
  

   Naturalists' 
  Soe. 
  vol. 
  i. 
  p. 
  178 
  &c. 
  (1875). 
  

  

  vol. 
  xxxviii. 
  n 
  

  

  