﻿R. 
  E. 
  TOMES 
  (m 
  LOWER-OOLITE 
  MADREPORARIA. 
  445 
  

  

  latter 
  would 
  alone 
  be 
  sufficient 
  to 
  distinguish 
  it 
  from 
  the 
  j^attheim 
  

   species. 
  But 
  it 
  was 
  not 
  until, 
  by 
  the 
  kindness 
  of 
  Dr. 
  Holl, 
  I 
  had 
  

   examined 
  the 
  type 
  specimen 
  of 
  the 
  Gyclolites 
  Lycetti 
  of 
  Prof. 
  Dun- 
  

   can, 
  that 
  I 
  discovered 
  that 
  the 
  Crickley 
  coral 
  I 
  had 
  referred 
  

   to 
  D. 
  cluhia 
  was 
  specifically 
  identical 
  with 
  it. 
  On 
  removing 
  

   some 
  of 
  the 
  soft 
  stony 
  matter 
  from 
  the 
  calicular 
  surface 
  of 
  the 
  

   figured 
  specimen 
  of 
  Cyclolites 
  Lycetti, 
  a 
  central 
  large 
  calice 
  sur- 
  

   rounded 
  by 
  a 
  circle 
  of 
  smaller 
  ones 
  was 
  revealed, 
  and 
  the 
  true 
  genus 
  

   determined. 
  

  

  Prof. 
  Duncan's 
  specific 
  name 
  must, 
  of 
  course, 
  on 
  account 
  of 
  its 
  

   priority, 
  be 
  retained. 
  

  

  The 
  genus 
  Dhnorpharcea 
  of 
  M. 
  de 
  Eromentel 
  has 
  been 
  created 
  for 
  

   such 
  massive 
  Microsolence 
  as 
  have 
  a 
  central 
  large 
  calice 
  surrounded 
  

   by 
  smaller 
  ones 
  arranged 
  more 
  or 
  less 
  in 
  circles. 
  To 
  it 
  must 
  be 
  

   referred, 
  as 
  has 
  been 
  shown 
  by 
  Becker 
  and 
  Milaschewitsch, 
  the 
  

   Dimorphoseris 
  of 
  Duncan. 
  The 
  D. 
  oolitica 
  of 
  that 
  palaeontologist, 
  

   with 
  the 
  species 
  I 
  here 
  introduce, 
  make 
  up 
  five 
  species 
  of 
  this 
  genus, 
  

   which 
  is 
  now 
  for 
  the 
  first 
  time 
  made 
  known 
  as 
  English. 
  

  

  DlMORPHAR^A 
  PEDUNCTJLATA, 
  U. 
  Sp. 
  

  

  The 
  corallum 
  is 
  small, 
  attached, 
  fungiform, 
  and 
  supported 
  on 
  a 
  

   narrow 
  peduncle. 
  

  

  The 
  peduncle 
  is 
  small 
  at 
  its 
  attachment, 
  but 
  gradually 
  expands 
  

   upwards. 
  The 
  under 
  surface 
  of 
  the 
  fungiform 
  part 
  of 
  the 
  corallum 
  

   is 
  more 
  or 
  less 
  concave 
  ; 
  and 
  both 
  it 
  and 
  the 
  peduncle 
  are 
  furnished 
  

   with 
  a 
  thick 
  and 
  wrinkled 
  epitheca 
  which 
  has 
  concentric 
  folds. 
  

  

  The 
  upper 
  surface 
  is 
  convex, 
  in 
  one 
  specimen 
  dome-shaped 
  ; 
  and 
  

   the 
  outer 
  margin 
  is 
  rather 
  thin 
  and 
  overhanging. 
  

  

  The 
  central 
  or 
  principal 
  calice 
  is 
  large, 
  round, 
  and 
  has 
  exsert 
  

   septa 
  and 
  a 
  small 
  and 
  shallow 
  but 
  clearly 
  defined 
  and 
  round 
  

   fossula. 
  

  

  There 
  are 
  as 
  many 
  as 
  two 
  circles 
  of 
  calices 
  around 
  the 
  principal 
  

   ones, 
  which 
  are 
  rather 
  irregularly 
  placed 
  ; 
  and 
  in 
  the 
  inner 
  circle 
  

   are 
  one 
  or 
  two 
  more 
  developed 
  than 
  the 
  others, 
  and 
  which 
  make 
  

   some 
  approach 
  to 
  the 
  size 
  of 
  the 
  primary 
  one. 
  They 
  are 
  not 
  at 
  all 
  

   closely 
  placed 
  in 
  the 
  circle; 
  the 
  spaces 
  between 
  them 
  are 
  

   nearly 
  as 
  great 
  as 
  the 
  space 
  between 
  the 
  circles. 
  

  

  The 
  septa 
  are 
  very 
  uniform 
  in 
  thickness 
  throughout 
  their 
  length, 
  

   and 
  straight. 
  There 
  are 
  three 
  complete 
  cycles 
  and 
  part 
  of 
  a 
  

   fourth. 
  Twelve 
  principal 
  septa, 
  which 
  are 
  of 
  uniform 
  size, 
  pass 
  

   quite 
  into 
  the 
  centre 
  of 
  the 
  fossula, 
  but 
  do 
  not 
  unite 
  with 
  each 
  

   other. 
  The 
  tertiary 
  ones 
  are 
  fully 
  three 
  fourths 
  the 
  length 
  of 
  

   those 
  of 
  the 
  primary 
  and 
  secondary 
  cycles, 
  and 
  those 
  of 
  the 
  fourth 
  

   are 
  only 
  a 
  little 
  shorter. 
  Some 
  of 
  those 
  of 
  the 
  fourth 
  run 
  into 
  

   those 
  of 
  the 
  third 
  cycle 
  ; 
  but 
  the 
  twelve 
  principal 
  septa, 
  which 
  are 
  

   visibly 
  stouter 
  than 
  the 
  others, 
  maintain 
  their 
  independence 
  through- 
  

   out. 
  All 
  of 
  them 
  are 
  distinctly 
  moniliform. 
  

  

  Height 
  of 
  the 
  corallum 
  8 
  lines, 
  of 
  which 
  the 
  peduncle 
  takes 
  

   one 
  half. 
  

  

  