﻿BRYOZOA 
  FROM 
  THE 
  INFERIOR 
  OOLITE 
  OF 
  SHIPTON 
  GORGE. 
  561 
  

  

  35. 
  On 
  some 
  Bryozoa 
  from 
  the 
  Inferior 
  Oolite 
  of 
  Shipton 
  Gorge, 
  

   Dorset. 
  By 
  Edwin 
  A. 
  Walford, 
  Esq., 
  F.G.S. 
  — 
  Part 
  I. 
  (Read 
  

   April 
  3, 
  1889.) 
  

  

  [Plates 
  XYII.-XIX.] 
  

  

  So 
  little 
  attention 
  appears 
  to 
  have 
  been 
  paid 
  by 
  British 
  palaeonto- 
  

   logists 
  to 
  the 
  Jurassic 
  Bryozoa, 
  that 
  a 
  few 
  scattered 
  papers 
  constitute 
  

   the 
  literature 
  of 
  the 
  subject, 
  and 
  hardly 
  a 
  dozen 
  new 
  forms 
  have 
  

   been 
  described 
  since 
  the 
  appearance 
  of 
  Haime's 
  Monograph 
  in 
  1854. 
  

   In 
  a 
  paper 
  on 
  some 
  Lias 
  Polyzoa 
  *, 
  I 
  believe 
  I 
  have 
  given 
  the 
  titles 
  

   of 
  nearly 
  all 
  of 
  the 
  papers. 
  Mr. 
  Vine's 
  Richmond 
  report 
  f 
  and 
  

   two 
  later 
  contributions 
  complete 
  the 
  list. 
  This 
  neglect 
  can 
  scarcely 
  

   be 
  accounted 
  for 
  by 
  the 
  absence 
  of 
  material 
  to 
  work 
  upon, 
  for 
  

   though 
  the 
  argillaceous 
  seas 
  of 
  the 
  Lias 
  were 
  not 
  favourable 
  to 
  the 
  

   development 
  of 
  the 
  Bryozoa, 
  either 
  in 
  numbers 
  or 
  species, 
  yet 
  under 
  

   the 
  calcareous 
  conditions 
  of 
  the 
  Inferior 
  and 
  Great 
  Oolite 
  the 
  contrary 
  

   was 
  the 
  case. 
  The 
  reason 
  may 
  be 
  sought 
  for, 
  perhaps, 
  in 
  the 
  frequently 
  

   unsatisfactory 
  state 
  of 
  preservation 
  of 
  the 
  delicate 
  features 
  necessary 
  

   for 
  their 
  study, 
  as 
  well 
  as 
  in 
  the 
  difficulties 
  into 
  which 
  the 
  classi- 
  

   fication 
  has 
  drifted. 
  Certain 
  it 
  is 
  that 
  too 
  many 
  species 
  have 
  been 
  

   created 
  out 
  of 
  ill-preserved 
  examples, 
  and 
  thus 
  another 
  barrier 
  has 
  

   been 
  raised 
  in 
  the 
  way 
  of 
  systematic 
  nomenclature. 
  It 
  can 
  scarcely, 
  

   however, 
  be 
  said 
  that 
  there 
  is 
  yet 
  formed 
  a 
  natural 
  system 
  of 
  

   classification 
  for 
  the 
  division 
  to 
  which 
  most 
  of 
  the 
  Lower 
  Jurassic 
  

   forms 
  belong. 
  

  

  In 
  1885, 
  when 
  studying 
  the 
  Inferior 
  Oolite 
  in 
  the 
  neighbourhood 
  

   of 
  Bridport, 
  I 
  detected 
  in 
  a 
  small 
  quarry 
  some 
  marly 
  beds 
  rich 
  in 
  

   numerous 
  species 
  of 
  Bryozoa, 
  and 
  containing 
  an 
  otherwise 
  remark- 
  

   able 
  fauna 
  — 
  Echinoderms, 
  small 
  Brachiopods 
  {Crania, 
  Thecidea, 
  

   &c), 
  Sponges, 
  and 
  Eoraminifera. 
  The 
  tranquil 
  conditions 
  prevailing 
  

   during 
  the 
  deposition 
  of 
  the 
  beds 
  are 
  indicated 
  by 
  the 
  presence 
  of 
  

   so 
  many 
  slender 
  and 
  arborescent 
  forms 
  of 
  Bryozoa, 
  as 
  well 
  as 
  by 
  the 
  

   Crinoids 
  and 
  Sponges. 
  That 
  the 
  horizon 
  of" 
  the 
  Inferior 
  Oolite 
  in 
  

   which 
  the 
  forms 
  mentioned 
  are 
  found 
  is 
  the 
  upper 
  division 
  is 
  shown 
  

   by 
  the 
  presence 
  of 
  a 
  few 
  characteristic 
  shells, 
  notably 
  Terebratula 
  

   Phillipsii, 
  Crania 
  canalis, 
  Moore, 
  and 
  Acanthothyris 
  joanacanthina, 
  

   Buckm. 
  & 
  Walker. 
  The 
  zone 
  is 
  apparently 
  that 
  of 
  Ammonites 
  

   Parkinsoni. 
  It 
  is 
  worth 
  note 
  that 
  Eug. 
  Deslongchamps 
  J 
  quotes 
  a 
  

   somewhat 
  similar 
  fauna 
  of 
  Echinoderms, 
  Bryozoa, 
  and 
  Sponges 
  as 
  

   occurring 
  in 
  the 
  " 
  Oolithe 
  Blanche 
  " 
  of 
  Calvados. 
  

  

  The 
  following 
  section 
  will 
  illustrate 
  the 
  position 
  of 
  the 
  calcareo- 
  

  

  * 
  " 
  On 
  some 
  Polyzoa 
  from 
  the 
  Lias," 
  by 
  E. 
  A. 
  Walford, 
  F.G.S., 
  Quart. 
  

   Journ. 
  Geo! 
  Soc. 
  vol. 
  xliii. 
  (1887), 
  p. 
  632. 
  

  

  t 
  " 
  On 
  Polyzoa 
  found 
  in 
  the 
  boring 
  at 
  Richmond, 
  Surrey," 
  by 
  G. 
  E. 
  Vine, 
  

   Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xl. 
  (1884), 
  p. 
  784. 
  

  

  | 
  Etudes 
  Jurass. 
  Inf. 
  de 
  la 
  JNormandie, 
  par 
  M. 
  Eug. 
  Eudes 
  Deslongchamps, 
  

   p. 
  109 
  (Paris 
  & 
  Caen, 
  1864). 
  

  

  Q. 
  J.G.S. 
  Iso. 
  179. 
  2e 
  

  

  