﻿116 
  TwEXTY-EIGHTH 
  EePORT 
  OX 
  THE 
  STATE 
  MlJBBUlL 
  

  

  times 
  nearly 
  circular, 
  closely 
  and 
  irregularly 
  arranged. 
  In- 
  

   tercellular 
  space 
  usually 
  occupied 
  by 
  a 
  single 
  series 
  of 
  angular 
  

   pits. 
  Margins 
  of 
  cell-apertures 
  elevated, 
  and 
  ornamented 
  by 
  

   from 
  two 
  to 
  five 
  short 
  spinules. 
  A 
  transparent 
  section 
  shows 
  

   an 
  intercellular 
  vesiculose 
  structure, 
  with 
  transverse 
  septa 
  in 
  

   the 
  cell-tubes. 
  

  

  The 
  more 
  recent 
  collections 
  from 
  TTaldron 
  contain 
  a 
  con- 
  

   siderable 
  number 
  of 
  specimens 
  of 
  this 
  species 
  in 
  various 
  

   conditions 
  of 
  preservation. 
  The 
  better 
  specimens 
  preserve 
  

   the 
  short 
  spinules 
  surrounding 
  the 
  cell 
  apertures, 
  with 
  a 
  dis- 
  

   tinct 
  row 
  of 
  pits 
  marking 
  the 
  intercellular 
  space. 
  In 
  some 
  

   of 
  the 
  specimens 
  the 
  spinulae 
  are 
  more 
  or 
  less 
  worn 
  away 
  or 
  

   irregularly 
  preserved, 
  and 
  in 
  further 
  wearing, 
  the 
  intercellular 
  

   spaces 
  appear 
  as 
  thick, 
  solid 
  walls 
  separating 
  the 
  cell-aper- 
  

   tures. 
  The 
  specimen 
  originally 
  figured 
  as 
  Alveolites 
  exstU 
  

   is 
  evidently 
  a 
  Callopoea 
  encrusting 
  and 
  on]y 
  partially 
  cov- 
  

   ering 
  the 
  surface 
  of 
  Ceramopora 
  confluens. 
  The 
  illustration 
  

   in 
  figure 
  4 
  of 
  plate 
  9 
  is 
  incorrect 
  in 
  representing 
  the 
  cell- 
  

   apertures 
  as 
  angular 
  and 
  oblique, 
  while 
  the 
  cells 
  open 
  directly 
  

   upwards: 
  the 
  intercellular 
  spaces 
  are 
  thicker 
  and 
  covered 
  

   with 
  granula?. 
  and 
  are 
  formed 
  by 
  numerous 
  very 
  small 
  angular 
  

   pits 
  or 
  pores. 
  

  

  It 
  is 
  distinguished 
  from 
  a 
  condition 
  of 
  Ceramopora 
  confluens 
  

   by 
  the 
  intercellular 
  granular 
  and 
  pits. 
  

  

  LICHEXALIA 
  Rail. 
  

  

  LlCHEXALlA 
  COXCEXTEICA. 
  

   Plate 
  5, 
  Figs. 
  9-16: 
  Plate 
  6, 
  Figs. 
  1. 
  2. 
  4. 
  7-10, 
  and 
  Plate 
  7, 
  Figs. 
  3-11. 
  

   Lichenalia 
  concentrica 
  Hall. 
  Pal. 
  X. 
  Y.. 
  vol. 
  ii. 
  p. 
  171. 
  pi. 
  40E. 
  figs. 
  b.i-o:. 
  1S52. 
  

  

  The 
  name 
  Lichexalia" 
  was 
  originally 
  applied 
  by 
  me 
  to 
  cir- 
  

   cular 
  or 
  fiabelliform 
  epithecal 
  expansions, 
  one 
  side 
  of 
  which 
  is 
  

   concentrically 
  wrinkled, 
  and 
  when 
  in 
  perfect 
  condition 
  is 
  usu- 
  

   ally 
  marked 
  by 
  fine 
  radiating 
  and 
  concentric 
  stria?, 
  which 
  

   vary 
  in 
  character 
  and 
  degree 
  in 
  different 
  species. 
  The 
  op- 
  

   posite 
  side 
  is 
  celluliferous. 
  The 
  celluliferous 
  face 
  is 
  usu- 
  

   ally 
  adherent 
  to 
  the 
  stone, 
  and 
  the 
  exposed 
  surface 
  pre- 
  

   sents 
  the 
  ordinary 
  characters 
  of 
  the 
  epitkecal 
  covering 
  of 
  

   a 
  coral 
  or 
  bryozoum. 
  In 
  well-preserved 
  examples 
  the 
  tine 
  

   concentric 
  and 
  radiating 
  stria? 
  are 
  apparently 
  character- 
  

   istic 
  of 
  the 
  genus, 
  and 
  in 
  some 
  specimens 
  the 
  cell-bases 
  

   are 
  visible 
  from 
  the 
  non-celluliferous 
  face. 
  When 
  the 
  exte- 
  

  

  * 
  Palceontology 
  of 
  Xeic 
  York, 
  vol. 
  ii. 
  p. 
  171. 
  

  

  