﻿G. 
  E. 
  VINE 
  ON 
  THE 
  WEDLOCK 
  POLYZOA. 
  

  

  57 
  

  

  only 
  superficially 
  exact 
  ; 
  yet 
  we 
  have 
  no 
  other 
  genus 
  in 
  which 
  the 
  

   type 
  can 
  be 
  so 
  conveniently 
  placed 
  as 
  the 
  genus 
  Spiropora. 
  

  

  Locality. 
  More 
  or 
  less 
  abundant 
  in 
  the 
  washings 
  of 
  the 
  Buildwas 
  

   beds, 
  Wenlock 
  Limestone, 
  and 
  in 
  the 
  shales 
  over 
  the 
  Wenlock 
  Lime- 
  

   stone. 
  Not 
  frequent, 
  but 
  present 
  in 
  about 
  the 
  same 
  proportion 
  to 
  

   the 
  other 
  fossils 
  in 
  the 
  Niagara 
  Limestone 
  of 
  Lockport 
  as 
  in 
  the 
  

   Wenlock 
  Limestone, 
  Dudley. 
  

  

  Pigs. 
  7 
  & 
  8. 
  — 
  Spiropora 
  intermedia, 
  Vine. 
  

   7 
  8 
  

  

  7. 
  The 
  whole 
  of 
  the 
  cells 
  on 
  the 
  portion 
  of 
  branch 
  selected 
  for 
  illustration 
  : 
  

  

  X 
  12. 
  8. 
  Four 
  cells 
  from 
  fig. 
  7 
  further 
  enlarged, 
  to 
  show 
  the 
  various 
  con- 
  

   ditions 
  of 
  the 
  cell-mouth 
  : 
  X 
  24. 
  

  

  8. 
  Spiropora 
  intermedia, 
  sp. 
  n. 
  (Pigs. 
  7, 
  8.) 
  

  

  Zoarium 
  cylindrical, 
  subcylindrical, 
  club-shaped, 
  branching 
  or 
  

   not. 
  Zocecia 
  tubular 
  when 
  perfect 
  — 
  when 
  worn, 
  elongately 
  oval 
  or 
  

   pyriform 
  — 
  adnate 
  or 
  free 
  ; 
  orifice 
  circular, 
  raised 
  or 
  decumbent; 
  peri- 
  

   stome 
  thick. 
  Cells 
  irregularly 
  or 
  spirally 
  arranged, 
  opening 
  on 
  all 
  

   sides, 
  and 
  clustering 
  in 
  the 
  thickened 
  or 
  club-shaped 
  specimens 
  

   without 
  any 
  definite 
  order. 
  Cells 
  occasionally 
  exserted 
  and 
  bent 
  

   round. 
  Generally 
  speaking, 
  two 
  cells 
  occupy 
  the 
  space 
  of 
  a 
  line 
  ; 
  but 
  

   some 
  of 
  the 
  exserted 
  cells 
  measure 
  three 
  quarters 
  of 
  a 
  line 
  in 
  length. 
  

  

  Locality. 
  Tickwood 
  beds 
  ; 
  in 
  no. 
  25 
  washing 
  only. 
  

  

  It 
  is 
  necessary, 
  from 
  the 
  anomalous 
  character 
  of 
  this 
  species, 
  to 
  

   direct 
  particular 
  attention 
  to 
  the 
  exserted 
  cells 
  in 
  some 
  parts 
  of 
  the 
  

   zoarium. 
  In 
  this 
  respect 
  they 
  present 
  an 
  appearance 
  closely 
  resem- 
  

   bling 
  that 
  of 
  Entalophora. 
  Indeed, 
  if 
  I 
  were 
  dealing 
  with 
  Tertiary 
  

   species 
  of 
  Polyzoa, 
  such 
  as 
  the 
  Montecchio 
  Maggiore 
  material, 
  and 
  

   found 
  amongst 
  the 
  number 
  a 
  specimen 
  having 
  cells 
  of 
  a 
  similar 
  

   character 
  to 
  the 
  one 
  I 
  am 
  dealing 
  with, 
  I 
  should 
  not 
  have 
  the 
  

   least 
  hesitation 
  in 
  placing 
  it 
  under 
  the 
  genus 
  Entalophora. 
  In 
  the 
  

   Tertiary 
  species, 
  however 
  aged 
  the 
  colony 
  might 
  be 
  by 
  calcareous 
  in- 
  

   crustations, 
  in 
  some 
  patch 
  I 
  should 
  be 
  able 
  to 
  detect 
  the 
  rugose 
  

   markings 
  or 
  the 
  punctures 
  peculiar 
  to 
  this 
  and 
  other 
  genera 
  of 
  the 
  

  

  