﻿G. 
  K. 
  VINE 
  ON 
  THE 
  WENLOCK 
  POLYZOA. 
  63 
  

  

  Glauconome, 
  Goldfuss, 
  1826. 
  

  

  In 
  1849 
  Mr. 
  King 
  very 
  wisely 
  discussed 
  the 
  impropriety 
  of 
  accept- 
  

   ing 
  the 
  Glauconome 
  of 
  Goldfuss 
  as 
  a 
  genus 
  of 
  Palaeozoic 
  Polyzoa. 
  

   He 
  says 
  "the 
  genus 
  was 
  typified 
  by 
  a 
  Tertiary-like 
  Cellaria-salicornia 
  

  

  G. 
  marginata 
  In 
  this 
  case 
  the 
  name 
  Glauconome 
  becomes 
  

  

  obsolete." 
  To 
  take 
  in 
  such 
  forms 
  as 
  Retepora 
  pluma 
  and 
  the 
  Glau- 
  

   conome 
  of 
  M 
  c 
  Coy, 
  Mr. 
  King 
  founded 
  the 
  genus 
  Acanthocladia. 
  

   Seeing 
  that 
  the 
  type 
  G. 
  clisticha, 
  Goldfuss, 
  was 
  accepted 
  by 
  Lons- 
  

   dale, 
  and 
  has 
  since 
  been 
  generally 
  accepted 
  by 
  authors, 
  and 
  not 
  

   the 
  G. 
  marginata, 
  Minister, 
  it 
  seems 
  to 
  me 
  that 
  Glauconome 
  ought 
  to 
  

   keep 
  its 
  place 
  in 
  our 
  literary 
  history. 
  Acanthocladia 
  too 
  is 
  neither 
  

   a 
  Silurian 
  nor 
  a 
  Carboniferous 
  typical 
  genus. 
  It 
  is 
  applicable 
  for 
  

   Permian, 
  not 
  for 
  earlier 
  types. 
  

  

  1839. 
  Restricted 
  by 
  Lonsdale, 
  ' 
  Silurian 
  System/ 
  

  

  This 
  genus 
  founded 
  by 
  Goldfuss, 
  was 
  originally 
  intended 
  for 
  

   species 
  of 
  Cellaria 
  which 
  were 
  figured 
  and 
  described 
  by 
  Miinster 
  in 
  

   the 
  Petr. 
  Germ. 
  tab. 
  36. 
  figs. 
  5 
  to 
  8. 
  The 
  placing 
  under 
  the 
  

   generic 
  description 
  a 
  species 
  of 
  Silurian 
  Polyzoa 
  by 
  its 
  author 
  is 
  

   sufficient 
  to 
  redeem 
  it 
  from 
  oblivion. 
  The 
  diagnosis, 
  as 
  furnished 
  by 
  

   Goldfuss, 
  is 
  useless 
  ; 
  and 
  we 
  are 
  obliged 
  to 
  accept 
  the 
  restricted 
  defini- 
  

   tion 
  originally 
  given 
  by 
  Lonsdale, 
  but 
  somewhat 
  modified 
  by 
  M 
  c 
  

   Coy. 
  

  

  " 
  Zoarium 
  strong, 
  thin, 
  laterally 
  branched, 
  bearing 
  longitudinally 
  

   disposed 
  cells. 
  Branches 
  not 
  united 
  by 
  transverse 
  dissepiments 
  : 
  

   reverse 
  striated." 
  

  

  16. 
  Glauconome 
  disticha, 
  Goldfuss. 
  

  

  Zoarium 
  branched, 
  the 
  branches 
  diverging 
  nearly 
  at 
  right 
  angles, 
  

   both 
  from 
  the 
  central 
  stem, 
  and 
  from 
  the 
  lateral 
  branches 
  : 
  four 
  

   rows 
  of 
  long 
  quadrangular 
  cells 
  on 
  one 
  side, 
  the 
  opposite 
  side 
  striated. 
  

   (< 
  Sil. 
  System,' 
  pi. 
  15. 
  fig. 
  12.) 
  

  

  The 
  above 
  is 
  Lonsdale's 
  description 
  of 
  the 
  specimens 
  found 
  in 
  the 
  

   "Wenlock 
  Limestones. 
  The 
  description 
  of 
  Goldfuss 
  is 
  somewhat 
  

   different 
  ; 
  but 
  the 
  types 
  described 
  by 
  the 
  two 
  authors 
  are 
  the 
  same 
  

   (Petr. 
  Germ. 
  pi. 
  65. 
  fig. 
  15, 
  p. 
  217). 
  

  

  This 
  species 
  is 
  present, 
  but 
  not 
  very 
  widely 
  distributed, 
  in 
  the 
  

   shales. 
  In 
  the 
  Tickwood 
  beds, 
  in 
  the 
  washing 
  marked 
  25, 
  it 
  is 
  rather 
  

   plentiful 
  ; 
  but 
  fragments 
  are 
  not 
  what 
  may 
  be 
  called 
  abundant 
  even 
  

   here. 
  The 
  only 
  other 
  shales 
  in 
  which 
  1 
  have 
  found 
  any 
  quantity 
  of 
  

   specimens 
  are 
  24 
  and 
  46 
  ; 
  and 
  these 
  are 
  washings 
  of 
  shales 
  from 
  over 
  

   the 
  Wenlock 
  Limestone. 
  

  

  Ptilodictya, 
  Lonsdale. 
  

  

  1839. 
  Ptilodictya, 
  Lonsdale, 
  ' 
  Silurian 
  System,' 
  descriptive 
  text 
  of 
  

   pi. 
  15. 
  

  

  This 
  genus 
  was 
  founded 
  by 
  Lonsdale 
  for 
  a 
  most 
  peculiar 
  group 
  of 
  

   Polyzoa 
  which 
  were 
  very 
  widely 
  distributed 
  in 
  the 
  Silurian 
  rocks, 
  

   and 
  survived 
  in 
  some 
  places 
  even 
  into 
  the 
  Devonian. 
  The 
  type 
  

   of 
  Lonsdale's 
  genus 
  is 
  a 
  Flastra 
  of 
  Goldfuss 
  ; 
  and 
  his 
  species 
  is 
  found 
  

   in 
  the 
  Wenlock 
  Limestone. 
  

  

  