﻿882 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  In 
  1842, 
  Prof. 
  D. 
  D. 
  Owen, 
  in 
  Amer. 
  Jour. 
  Science, 
  vol. 
  43, 
  

   p. 
  19, 
  published 
  a 
  figure 
  of 
  Le 
  Sueur's 
  proposed 
  genus 
  A 
  rchimedes, 
  

   which 
  differs 
  from 
  the 
  ordinary 
  forms 
  of 
  Fenestella 
  in 
  its 
  spiral 
  

   mode 
  of 
  growth.* 
  

  

  In 
  1844, 
  Prof. 
  McCoy 
  (Carb. 
  Foss. 
  of 
  Ireland, 
  p. 
  206) 
  pro- 
  

   posed 
  a 
  new 
  genus, 
  Polypora, 
  and 
  referring 
  to 
  the 
  genus 
  

   Fenestella 
  of 
  Miller, 
  as 
  described 
  by 
  Lonsdale 
  in 
  1841, 
  says: 
  

   "From 
  Fenestella 
  it 
  is 
  well 
  distinguished 
  by 
  the 
  numerous 
  

   rows 
  of 
  pores 
  and 
  the 
  absence 
  of 
  a 
  keel 
  on 
  the 
  interstices 
  

   (branches)." 
  

  

  In 
  1^45, 
  Lonsdale 
  (Russia 
  and 
  the 
  Ural 
  Mountains, 
  Yol. 
  I, 
  

   appendix 
  A, 
  p. 
  6z9) 
  gives 
  the 
  following 
  generic 
  characters 
  of 
  

   Fenestella: 
  

  

  "A 
  ramose 
  cellular, 
  calcareous 
  polypidom 
  ; 
  cells 
  variously 
  dis- 
  

   tributed 
  on 
  one 
  side 
  of 
  the 
  branches, 
  with 
  or 
  without 
  dividing 
  

   ridges 
  ; 
  branches 
  connected 
  by 
  transverse 
  or 
  oblique 
  processes, 
  

   cellular 
  or 
  not, 
  forming 
  generally 
  expansions 
  or 
  funnel-shaped 
  

   bodies; 
  the 
  latter 
  with 
  the 
  cellular 
  surface 
  sometimes 
  on 
  the 
  

   inner, 
  sometimes 
  on 
  the 
  outer 
  side 
  ; 
  cells 
  cylindrical, 
  obliquely 
  

   arranged, 
  overlying, 
  mouths 
  inclined 
  outward, 
  more 
  or 
  less 
  

   distant 
  ; 
  interior 
  of 
  mature 
  specimens 
  a 
  layer 
  of 
  vertical 
  capillary 
  

   tubuli; 
  reverse 
  side 
  of 
  young 
  specimens, 
  the 
  layer 
  tubuli, 
  

   of 
  mature 
  specimens, 
  a 
  crust 
  perforated 
  by 
  minute 
  pores 
  ; 
  in 
  aged 
  

   specimens 
  both 
  cellular 
  and 
  reverse 
  surfaces 
  greatly 
  thickened, 
  

   all 
  external 
  ribs 
  or 
  sculpturing 
  obliterated, 
  and 
  oval 
  apertures 
  

   more 
  or 
  less 
  contracted 
  ; 
  a 
  row 
  of 
  foramina 
  or 
  chambers 
  between 
  

   parallelly-dis 
  posed 
  cells, 
  or 
  a 
  small 
  cavity 
  over 
  the 
  mouth 
  in 
  

   species 
  with 
  cells 
  in 
  quincunx. 
  

  

  In 
  1847, 
  D'Orbigny 
  proposed 
  the 
  genus 
  Eeteporina, 
  consist- 
  

   ing 
  of 
  species 
  having 
  the 
  cellules, 
  " 
  placees 
  sur 
  deux 
  lignes 
  

   paralleles, 
  rapproches 
  regulieres, 
  longitudinales, 
  non 
  separees 
  par 
  

   une 
  cote, 
  sont 
  a 
  la 
  partie 
  superieure 
  de 
  branches 
  largement 
  

   anastomosees, 
  ne 
  maniere 
  a 
  ne 
  laisser 
  entre 
  elles 
  que 
  des 
  oscules 
  

   oblongs, 
  reguliers, 
  places 
  par 
  lignes 
  divergentes." 
  

  

  * 
  This 
  is 
  probably 
  the 
  first 
  published 
  notice 
  of 
  the 
  genus, 
  and 
  Dr. 
  Owen 
  remarks: 
  " 
  I 
  am 
  not 
  

   sure 
  that 
  Le 
  Sueur 
  ever 
  published 
  a 
  description 
  of 
  this 
  fossil, 
  but 
  I 
  know 
  that 
  when 
  he 
  

   resided 
  here 
  (New 
  Harmony) 
  he 
  engraved 
  a 
  plate 
  containing 
  several 
  views 
  of 
  it 
  with 
  that 
  

   Intention. 
  He 
  considers 
  it, 
  I 
  believe, 
  a 
  new 
  genus, 
  but 
  it 
  may 
  be 
  only 
  a 
  new 
  spec 
  es 
  of 
  Retepora, 
  

   if 
  so 
  most.aptly 
  entitled 
  Retepora 
  Archimedes." 
  

  

  