﻿PROCEEDINGS 
  OE 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  245 
  

  

  The 
  following 
  communications 
  were 
  read 
  : 
  — 
  

  

  1. 
  " 
  On 
  Thecospoadylus 
  Horneri, 
  a 
  new 
  Dinosaur 
  from 
  the 
  

   Hastings 
  Sand, 
  indicated 
  by 
  the 
  Sacrum 
  and 
  the 
  Neural 
  Canal 
  of 
  

   the 
  Sacral 
  Region." 
  By 
  Prof. 
  H. 
  G. 
  Seeley, 
  F.R.S., 
  F.G.S. 
  

  

  2. 
  " 
  On 
  the 
  Dorsal 
  Eegion 
  of 
  the 
  Vertebral 
  Column 
  of 
  a 
  new 
  

   Dinosaur, 
  indicating 
  a 
  new 
  genus, 
  Sphenospondylus, 
  from 
  the 
  

   Wealden 
  of 
  Brook, 
  in 
  the 
  Isle 
  of 
  Wight, 
  preserved 
  in 
  the 
  Wood- 
  

   wardian 
  Museum 
  of 
  the 
  University 
  of 
  Cambridge." 
  By 
  Prof. 
  H. 
  G. 
  

   Seeley, 
  F.R.S., 
  F.G.S. 
  

  

  3. 
  " 
  On 
  Organic 
  Remains 
  from 
  the 
  Upper 
  Permian 
  Strata 
  of 
  

   Kargalinsk 
  in 
  Eastern 
  Russia." 
  By 
  W. 
  H. 
  Twelvetrees, 
  Esq., 
  

  

  F.G.S. 
  

  

  4. 
  "The 
  Rhaetics 
  of 
  Nottinghamshire." 
  By 
  E. 
  Wilson, 
  Esq., 
  

  

  F.G.S. 
  

  

  5. 
  "On 
  the 
  Silurian 
  and 
  Cambrian 
  Strata 
  of 
  the 
  Baltic 
  provinces 
  

   of 
  Russia, 
  as 
  compared 
  with 
  those 
  of 
  Scandinavia 
  and 
  the 
  British 
  

   Islands." 
  By 
  Dr. 
  F. 
  Schmidt. 
  Communicated 
  by 
  Dr. 
  H. 
  Woodward, 
  

   F.R.S., 
  F.G.S. 
  

  

  6. 
  " 
  On 
  Chilostomatous 
  Bryozoa 
  from 
  Bairnsdale 
  (Gippsland)." 
  

   By 
  A. 
  W. 
  Waters. 
  Esq., 
  F.G.S. 
  

  

  7. 
  " 
  The 
  Silurian 
  Species 
  of 
  Glauconome, 
  and 
  a 
  suggested 
  Classi- 
  

   fication 
  of 
  the 
  Palaeozoic 
  Polyzoa." 
  By 
  G. 
  W. 
  Shrubsole, 
  Esq., 
  

   F.G.S., 
  and 
  G. 
  R. 
  Vine, 
  Esq. 
  

  

  [Abstract.] 
  

  

  The 
  authors 
  discussed 
  the 
  history 
  of 
  our 
  knowledge 
  of 
  the 
  genus 
  

   Glauconome, 
  and 
  especially 
  of 
  the 
  Silurian 
  species. 
  They 
  then 
  

   characterized 
  the 
  genus, 
  to 
  which 
  they 
  refer 
  only 
  the 
  Bala 
  species 
  

   formerly 
  regarded 
  as 
  identical 
  with 
  G. 
  disticha, 
  Goldf., 
  but 
  which 
  

   they 
  describe 
  as 
  G. 
  SedgwicHi, 
  Shrubs. 
  Glauconome 
  disticha, 
  Goldf., 
  

   from 
  the 
  Wenlock 
  of 
  Dudley, 
  is 
  taken 
  as 
  the 
  type 
  of 
  a 
  new 
  genus 
  

   Arcanopora. 
  

  

  The 
  authors 
  then 
  remarked 
  upon 
  the 
  characters 
  on 
  which 
  the 
  

   classification 
  of 
  the 
  Polyzoa 
  is 
  founded, 
  drawn 
  from 
  the 
  study 
  of 
  the 
  

   recent 
  forms, 
  and 
  stated 
  that 
  throughout 
  the 
  Cainozoic 
  and 
  Mesozoic 
  

   series 
  no 
  Polyzoa 
  are 
  known 
  which 
  cannot 
  be 
  referred 
  to 
  the 
  recog- 
  

   nized 
  groups. 
  Many 
  Palaeozoic 
  forms 
  are 
  in 
  a 
  different 
  case. 
  The 
  

   orifices 
  seen 
  on 
  the 
  surface 
  are 
  not, 
  in 
  many 
  cases, 
  the 
  mouths 
  

   of 
  the 
  cells, 
  but 
  those 
  of 
  what 
  the 
  authors 
  call 
  vestibules, 
  beneath 
  

   which 
  the 
  true 
  cell-mouth 
  is 
  concealed. 
  For 
  these 
  types 
  they 
  

   propose 
  to 
  found 
  a 
  new 
  suborder 
  under 
  the 
  name 
  of 
  Cryptostomata, 
  

   characterized 
  by 
  having 
  the 
  zooecia 
  subtubular, 
  or, 
  in 
  section, 
  

   slightly 
  angular, 
  and 
  the 
  orifice 
  surrounded 
  by 
  a 
  vestibule 
  or 
  other- 
  

   wise 
  concealed. 
  The 
  families 
  referred 
  to 
  this 
  group 
  are 
  the 
  Ceramo- 
  

   poridae, 
  Ptilodictyidoe, 
  and 
  Arcanoporidae. 
  

  

  