﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  151 
  

  

  The 
  Lias 
  in 
  Gloucestershire 
  and 
  Worcestershire, 
  as 
  well 
  as 
  in 
  

   Yorkshire, 
  characterized 
  by 
  JEgoceras 
  Henleyi 
  contains 
  nearly 
  the 
  

   same 
  species 
  as 
  those 
  just 
  mentioned, 
  Rhabdocidaris 
  Moraldina,Hemi- 
  

   pedina 
  Jardini, 
  Opliioderma 
  Brodiei, 
  and 
  Pentacrinus 
  punctifer 
  being 
  

   newly 
  added. 
  None 
  of 
  the 
  German 
  beds 
  have 
  yielded 
  so 
  large 
  an 
  

   Asteroidal 
  or 
  Crinoidal 
  fauna 
  as 
  our 
  own 
  Middle 
  and 
  Lower 
  Lias 
  ; 
  but 
  

   little 
  can 
  be 
  said 
  for 
  the 
  abundance 
  of 
  the 
  Echinoidea 
  all 
  through 
  

   the 
  Lias. 
  

  

  The 
  Asteroidea 
  and 
  Crinoidea 
  in 
  the 
  widely-extended 
  zone 
  of 
  

   Amaltheus 
  margaritatus, 
  which 
  is 
  to 
  be 
  traced 
  from 
  the 
  Cleveland 
  

   area 
  in 
  Yorkshire 
  to 
  the 
  coast 
  near 
  Lyme 
  Eegis, 
  are 
  nearly 
  the 
  

   same 
  species 
  as 
  in 
  the 
  preceding, 
  Pentacrinus 
  gracilis, 
  however, 
  being 
  

   hitherto 
  unobserved. 
  The 
  Scotch 
  beds 
  on 
  this 
  horizon 
  do 
  not 
  appear 
  

   to 
  possess 
  remains 
  of 
  either 
  the 
  Echinoidea 
  or 
  the 
  Asteroidea. 
  

   Although 
  the 
  deposits 
  at 
  Skye 
  and 
  Raasay 
  are 
  largely 
  developed, 
  

   the 
  Yorkshire 
  sections 
  have 
  hitherto 
  yielded 
  the 
  richest 
  harvest 
  

   in 
  this 
  group 
  : 
  Aspidura 
  loricata, 
  Astropecten 
  Hastingsiai, 
  Opliio- 
  

   derma 
  Milleri, 
  Uraster 
  carinatus, 
  Ophiura 
  Murrayi, 
  &c. 
  all 
  occur 
  

   in 
  the 
  fine 
  section 
  at 
  Staithes. 
  

  

  Upper 
  Lias. 
  — 
  From 
  Somersetshire 
  to 
  Yorkshire 
  the 
  Upper 
  Lias 
  

   carries 
  with 
  it 
  successively 
  or 
  intermittently 
  the 
  series 
  of 
  clays 
  and 
  

   pseudo-limestones 
  containing 
  the 
  defined 
  horizons 
  of 
  Steplianoceras 
  

   annulatum, 
  Harpoceras 
  serpentinum, 
  and 
  H. 
  bifrons; 
  and 
  in 
  these 
  

   beds, 
  mostly 
  in 
  the 
  middle 
  of 
  England, 
  occur 
  Acrosalenia 
  crinifera, 
  

   Cidaris 
  ilminsterensis, 
  C. 
  Moorei, 
  Diplocidaris 
  Desori, 
  Hemipedina 
  

   Etheridgei, 
  Palceocoma 
  carinata, 
  6 
  species 
  of 
  Pentacrinus, 
  Pseudo- 
  

   diadema 
  Moorei, 
  and 
  P. 
  ivickense. 
  Not 
  a 
  single 
  species 
  of 
  Echino- 
  

   dermata 
  that 
  I 
  have 
  named, 
  nor 
  any 
  of 
  the 
  53 
  species 
  Jknown 
  

   to 
  occur 
  in 
  the 
  whole 
  of 
  the 
  Lias, 
  pass 
  the 
  upward 
  limits 
  of 
  the 
  for- 
  

   mation, 
  or 
  are 
  common 
  to 
  the 
  Oolitic 
  beds 
  above. 
  

  

  Annelida. 
  — 
  Eorty-five 
  species 
  have 
  been 
  described 
  from 
  the 
  entire 
  

   Jurassic 
  series, 
  from 
  the 
  Lias 
  to 
  the 
  Portland. 
  Serpula, 
  Vermilia, 
  

   and 
  Ditrypa 
  are 
  the 
  only 
  three 
  genera 
  known 
  in 
  the 
  Jurassic 
  rocks, 
  

   if 
  we 
  omit 
  Vermetus. 
  Eourteen 
  species 
  occur 
  in 
  the 
  three 
  divisions 
  

   of 
  the 
  Lias, 
  and 
  illustrate 
  the 
  three 
  genera 
  named 
  : 
  — 
  Serpula, 
  with 
  

   8 
  species 
  in 
  the 
  Lower 
  and 
  3 
  in 
  the 
  Middle 
  Lias 
  ; 
  Ditrypa, 
  with 
  

   2 
  species 
  in 
  the 
  Middle 
  Lias 
  ; 
  and 
  Vermilia, 
  with 
  2 
  species 
  in 
  the 
  

   Upper. 
  Serpula 
  lituiformis, 
  S. 
  socicdis, 
  and 
  Vermilia 
  sulcata 
  are 
  all 
  

   that 
  pass 
  to 
  the 
  Inferior 
  Oolite 
  or 
  any 
  higher 
  beds. 
  We 
  should 
  

   have 
  expected, 
  from 
  so 
  large 
  a 
  specific 
  fauna 
  in 
  the 
  Lias 
  (14 
  

   species 
  belonging 
  to 
  only 
  3 
  genera), 
  that 
  more 
  species 
  would 
  have 
  

   passed 
  to 
  higher 
  horizons, 
  the 
  division 
  Tubicola 
  (to 
  which 
  all 
  

   belong) 
  including 
  moderately 
  deep-sea 
  forms, 
  scarcely 
  subjected 
  to 
  

   the 
  same 
  vicissitudes 
  as 
  certain 
  genera 
  of 
  Mollusca, 
  littoral 
  in 
  their 
  

   habits. 
  

  

  The 
  45 
  species 
  of 
  Annelida 
  are 
  distributed 
  very 
  unequally 
  through 
  

   the 
  Jurassic 
  series 
  : 
  11 
  species 
  occur 
  in 
  the 
  Inferior 
  Oolite, 
  3 
  in 
  the 
  

   Puller's 
  Earth, 
  7 
  in 
  the 
  Great 
  Oolite, 
  1 
  in 
  the 
  Eorest-marble, 
  5 
  in 
  

   the 
  Cornbrash, 
  1 
  in 
  the 
  Kellaways 
  Bock, 
  2 
  in 
  the 
  Oxford 
  Clay, 
  7 
  in 
  

   the 
  Coral 
  Eag, 
  3 
  in 
  the 
  Kimmeridge 
  Clay, 
  and 
  4 
  in 
  the 
  Portland 
  

  

  