﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRE8IDENT. 
  1 
  65 
  

  

  From 
  the 
  Middle 
  Lias 
  of 
  the 
  Santon 
  railway- 
  cutting 
  Mr. 
  Cross 
  

   obtained 
  16 
  genera 
  and 
  26 
  species. 
  Taken 
  in 
  connexion 
  with 
  the 
  

   Yorkshire 
  Lias 
  to 
  the 
  north 
  of 
  the 
  Humber, 
  and 
  the 
  greatly 
  de- 
  

   veloped 
  beds 
  of 
  Lower 
  and 
  Middle 
  Lias 
  to 
  the 
  south 
  of 
  Mr. 
  Cross's 
  

   area 
  of 
  investigation, 
  few 
  papers 
  have 
  added 
  more 
  to 
  our 
  knowledge 
  

   of 
  the 
  Lower 
  Lias. 
  The 
  value 
  of 
  the 
  work 
  done 
  in 
  the 
  higher 
  mem- 
  

   bers 
  of 
  the 
  Jurassic 
  group 
  I 
  will 
  notice 
  under 
  that 
  head. 
  Six 
  new 
  

   species 
  were 
  added 
  to 
  the 
  Lias 
  and 
  Oolite 
  by 
  Mr. 
  Cross, 
  viz. 
  Tancredia 
  

   ferrea, 
  Cross 
  ; 
  T. 
  liassica, 
  Cross 
  ; 
  Hippopodium 
  ferri, 
  Cross 
  ; 
  

   Cucullcea 
  Rolandi, 
  Cross 
  ; 
  0. 
  suttonensis, 
  Cross 
  ; 
  and 
  Astarte 
  diva- 
  

   ricately 
  Cross. 
  The 
  three 
  first 
  named 
  are 
  Lower 
  Lias, 
  the 
  remain- 
  

   ing 
  three 
  Inferior 
  Oolite. 
  I 
  have 
  since 
  visited 
  the 
  localities 
  and 
  

   sections 
  described 
  by 
  Mr. 
  Cross, 
  with 
  my 
  late 
  colleagues 
  Messrs. 
  

   Strangways 
  and 
  Ussher, 
  adding 
  greatly 
  to 
  my 
  knowledge 
  of 
  the 
  

   Brigg 
  area 
  and 
  these 
  Lower-Lias 
  iron-ore 
  beds. 
  

  

  Prof. 
  Judd, 
  in 
  his 
  Eutland 
  Memoir 
  (loc. 
  cit.), 
  has, 
  from 
  personal 
  

   observation, 
  named 
  21 
  genera 
  and 
  52 
  species 
  from 
  the 
  Lower 
  Lias, 
  

   and 
  from 
  the 
  Middle 
  Lias 
  22 
  genera 
  and 
  38 
  species 
  ; 
  but 
  the 
  

   fauna 
  of 
  the 
  Upper 
  Lias 
  is 
  poor 
  in 
  all 
  but 
  Ammonites, 
  and 
  this 
  

   is 
  the 
  case 
  generally 
  south 
  of 
  the 
  Humber. 
  15 
  genera 
  and 
  28 
  species 
  

   occur 
  ; 
  but 
  of 
  this 
  number 
  13 
  species 
  belong 
  to 
  the 
  Ammonites. 
  

  

  Gasteropoda. 
  — 
  No 
  less 
  than 
  76 
  genera 
  and 
  1015 
  species 
  of 
  this 
  

   class 
  occur 
  in 
  the 
  Jurassic 
  rocks 
  in 
  the 
  British 
  islands 
  ; 
  and 
  51 
  

   genera 
  and 
  388 
  species 
  are 
  now 
  known 
  in 
  the 
  Lias. 
  They 
  are 
  dis- 
  

   tributed 
  as 
  follows 
  : 
  — 
  

  

  41 
  genera 
  and 
  226 
  species 
  occur 
  in 
  the 
  Lower 
  Lias, 
  

   27 
  „ 
  136 
  „ 
  Middle 
  Lias, 
  

  

  19 
  „ 
  55 
  „ 
  Upper 
  Lias 
  ; 
  

  

  but 
  only 
  6 
  genera 
  and 
  6 
  species 
  pass 
  to 
  the 
  Inferior 
  Oolite, 
  none 
  

   to 
  the 
  Fuller's 
  Earth, 
  and 
  only 
  1 
  genus 
  and 
  species 
  (Amberlya 
  capi- 
  

   tanea) 
  to 
  the 
  Great 
  Oolite 
  and 
  Forest 
  Marble. 
  None 
  range 
  higher. 
  

   These 
  6 
  genera 
  and 
  6 
  species 
  I 
  will 
  dispose 
  of 
  at 
  once. 
  They 
  are 
  

   Actaionina 
  pulla, 
  Amberlya 
  capitanea, 
  Ceriihium 
  papillosum, 
  JSatica 
  

   adducta, 
  Onustus 
  pyramidatus, 
  and 
  Pleurotomaria 
  princeps. 
  Those 
  

   genera 
  most 
  largely 
  represented, 
  and 
  therefore 
  probably 
  of 
  the 
  

   highest 
  stratigraphical 
  value, 
  are 
  the 
  following 
  : 
  — 
  

  

  Actseonina, 
  yielding 
  8 
  sp., 
  3 
  of 
  which 
  occur 
  in 
  L. 
  Lias, 
  3 
  in 
  M. 
  and 
  2 
  in 
  U. 
  Lias. 
  

  

  Cerithium, 
  

  

  49 
  

  

  30 
  

  

  Chemnitzia, 
  

  

  23 
  

  

  15 
  

  

  Discohelix, 
  

  

  9 
  

  

  6 
  

  

  Eulima, 
  

  

  10 
  

  

  3 
  

  

  Melania, 
  

  

  9 
  

  

  9 
  

  

  Patella, 
  

  

  10 
  

  

  8 
  

  

  Pleurotomaria, 
  

  

  39 
  

  

  24 
  

  

  Trochus, 
  

  

  41 
  

  

  19 
  

  

  Turbo, 
  

  

  49 
  

  

  20 
  

  

  Turritella, 
  

  

  12 
  

  

  8 
  

  

  10 
  „ 
  

  

  10 
  

  

  8 
  „ 
  

  

  2 
  

  

  2 
  „ 
  

  

  1 
  

  

  8 
  ,, 
  

  

  — 
  

  

  »> 
  

   2 
  „ 
  

  

  z 
  

  

  20 
  „ 
  

  

  2 
  

  

  20 
  „ 
  

  

  5 
  

  

  23 
  „ 
  

  

  9 
  

  

  2 
  „ 
  

  

  2 
  

  

  259 
  145 
  98 
  33 
  

  

  The 
  genera 
  Maria, 
  Amberlya, 
  Cryptamia, 
  Littorina, 
  Natica, 
  

   Nerincea, 
  Neritopsis, 
  Orthostoma, 
  Phasianella, 
  Pitonellus, 
  Solarium, 
  

  

  