﻿62 
  G. 
  E. 
  VINE 
  ON 
  THE 
  WENLOCK 
  POLYZOA. 
  

  

  species 
  of 
  Lonsdale 
  in 
  these 
  lower 
  beds 
  ; 
  neither 
  have 
  I 
  found 
  any 
  

   ally 
  of 
  the 
  smaller 
  in 
  the 
  higher 
  beds. 
  My 
  fragments 
  of 
  both 
  species 
  

   show 
  the 
  mode 
  of 
  growth 
  of 
  If. 
  ? 
  crassa 
  ; 
  and 
  also 
  of 
  H. 
  ? 
  delicatida 
  ; 
  

   and 
  these 
  are 
  different 
  in 
  their 
  origin 
  and 
  also 
  in 
  their 
  mode 
  of 
  

   development. 
  

  

  14. 
  PoLYPOEA? 
  PEOBLEMATICA, 
  sp. 
  n. 
  

  

  I 
  have 
  in 
  my 
  cabinet 
  several 
  specimens 
  of 
  a 
  most 
  peculiar 
  type 
  ; 
  

   but 
  whether 
  to 
  call 
  it 
  a 
  Polyzoon 
  or 
  an 
  Actinozoon 
  is 
  to 
  me 
  a 
  puzzle. 
  

   Salter 
  was 
  well 
  acquainted 
  with 
  the 
  organism 
  ; 
  but 
  I 
  believe 
  he 
  

   left 
  it 
  unnamed 
  amongst 
  the 
  Cambridge 
  fossils. 
  

  

  Zoarium 
  dendroid, 
  with 
  a 
  strong 
  base. 
  Zoceoia 
  on 
  one 
  side 
  

   irregularly 
  oval, 
  contiguous, 
  but 
  having 
  distinctly 
  individual 
  walls 
  

   to 
  each 
  cell, 
  though 
  to 
  all 
  appearance 
  the 
  walls 
  are 
  inseparable 
  : 
  on 
  

   the 
  reverse 
  of 
  the 
  zoarium 
  spaces 
  are 
  striated, 
  some 
  of 
  which 
  striae 
  

   enclose 
  a 
  slightly 
  elongated 
  nucleus 
  having 
  a 
  similar 
  appearance 
  to 
  

   that 
  found 
  in 
  the 
  reverse 
  side 
  of 
  species 
  of 
  Hornera. 
  I 
  am 
  unable 
  

   to 
  associate 
  it 
  with 
  any 
  known 
  species 
  of 
  Phjllopora 
  or 
  Polypora. 
  

  

  Localities. 
  Buildwas 
  beds 
  and 
  Tickwood 
  beds. 
  

  

  Fenestella, 
  Lonsdale, 
  1839. 
  

  

  15. 
  F. 
  peisca, 
  Lonsdale. 
  

  

  F. 
  Londsdulei, 
  d'Orb. 
  of 
  authors. 
  

  

  This 
  genus 
  has 
  been 
  ably 
  reviewed 
  and 
  revised 
  by 
  Mr. 
  G. 
  W. 
  

   Shrubsole, 
  F.G.S., 
  in 
  three 
  papers 
  read 
  before 
  the 
  Geological 
  Society*. 
  

   In 
  his 
  paper 
  on 
  British 
  Upper 
  Silurian 
  Fenestellidue 
  (May 
  1880), 
  

   the 
  author 
  writes 
  very 
  correctly 
  about 
  F. 
  prisca, 
  Lonsdale. 
  From 
  

   the 
  details 
  and 
  figures 
  furnished 
  by 
  Lonsdale 
  it 
  is 
  impossible 
  to 
  

   form 
  a 
  correct 
  idea 
  respecting 
  this 
  species 
  ; 
  and 
  d' 
  Orbigny 
  seems 
  

   to 
  have 
  added 
  but 
  little 
  to 
  the 
  details 
  after 
  changing 
  the 
  name. 
  So 
  

   far 
  as 
  these 
  authors 
  are 
  concerned, 
  Mr. 
  Shrubsole 
  did 
  perfectly 
  right 
  

   in 
  striking 
  this, 
  with 
  others, 
  off 
  the 
  list 
  of 
  our 
  described 
  Fenestella?. 
  

   I 
  have, 
  I 
  have 
  not 
  the 
  least 
  doubt, 
  specimens 
  of 
  the 
  species 
  de- 
  

   scribed 
  by 
  Lonsdale 
  as 
  F.prisca, 
  and 
  figured 
  as 
  such 
  in 
  pi. 
  15, 
  i 
  Sil. 
  

   System.' 
  The 
  specimens 
  are 
  about 
  the 
  same 
  size, 
  15 
  a 
  15 
  b 
  ; 
  but 
  they 
  

   are 
  so 
  incrusted 
  by 
  coral 
  growth 
  that 
  I 
  am 
  not 
  at 
  all 
  surprised 
  

   that 
  both 
  the 
  coral 
  growth 
  and 
  Fenestella 
  growth 
  should 
  form 
  parts 
  

   of 
  the 
  diagnosis 
  of 
  Lonsdale. 
  When 
  any 
  part 
  of 
  the 
  zoarium 
  is 
  free 
  

   from 
  the 
  parasite, 
  the 
  real 
  number 
  of 
  cells 
  on 
  each 
  side 
  of 
  the 
  

   fenestrule 
  is 
  three. 
  These 
  are 
  separated 
  by 
  a 
  keel 
  which 
  looks 
  like 
  

   a 
  dark 
  line 
  passing 
  along 
  the 
  centre 
  of 
  the 
  branch. 
  The 
  dissepiments 
  

   are 
  deeply 
  set 
  ; 
  but 
  the 
  most 
  characteristic 
  feature 
  is, 
  for 
  a 
  specimen 
  

   so 
  small, 
  the 
  strongly-rooted 
  base. 
  The 
  described 
  species 
  of 
  Fenes- 
  

   tella 
  which 
  form 
  the 
  substance 
  of 
  Mr. 
  Shrubsole's 
  second 
  paper 
  are 
  

   from 
  Wenlock 
  Limestone. 
  My 
  specimens 
  are 
  from 
  No. 
  25, 
  Tickwood 
  

   beds, 
  of 
  the 
  Wenlock 
  Shales. 
  So 
  very 
  scarce 
  are 
  even 
  fragments 
  

   of 
  Fenestella 
  in 
  these 
  shales 
  that 
  I 
  cannot 
  forbear 
  giving 
  the 
  

   specimens 
  I 
  have 
  found 
  prominence 
  in 
  this 
  report 
  on 
  the 
  organisms 
  

   of 
  the 
  Wenlock 
  Shales. 
  

  

  * 
  Quart. 
  Journ. 
  Gbol. 
  Soc. 
  May 
  1879, 
  May 
  1830, 
  May 
  1881. 
  

  

  