﻿PKOF. 
  P. 
  M. 
  DUNCAN 
  ON 
  THE 
  GENUS 
  STOLICZKAKIA. 
  71 
  

  

  summits, 
  with 
  solitary 
  eminences 
  between 
  them, 
  or 
  with 
  close 
  

   broadly 
  rounded 
  tubercles, 
  or 
  with 
  minute 
  granulations. 
  Bounded 
  

   or 
  oblique 
  or 
  linear 
  depressions 
  occur 
  on 
  the 
  surface, 
  usually 
  between 
  

   the 
  eminences, 
  but 
  sometimes 
  upon 
  them 
  ; 
  they 
  are 
  shallow 
  and 
  are 
  

   bounded 
  by 
  tubes, 
  some 
  of 
  which 
  open 
  on 
  their 
  floor. 
  The 
  surface 
  

   has 
  tubes 
  opening 
  on 
  it 
  from 
  the 
  internal 
  radial 
  series, 
  and 
  also 
  

   from 
  the 
  interradial 
  tube-reticulation 
  ; 
  also 
  masses 
  of 
  tubes 
  running 
  

   over 
  it, 
  converging 
  on 
  the 
  eminences, 
  and 
  more 
  or 
  less 
  reticulate 
  

   elsewhere. 
  

  

  Radial 
  congeries 
  of 
  tubes 
  numerous 
  and 
  denned 
  ; 
  and 
  the 
  inter- 
  

   radial 
  tubulation 
  is 
  open 
  or 
  close 
  and 
  varicose. 
  

  

  Genus 
  Stoliczkakia. 
  

  

  Body 
  very 
  large, 
  symmetrical, 
  oblately 
  spheroidal, 
  covered 
  with 
  a 
  

   great 
  number 
  of 
  minute 
  distinct 
  granulations, 
  which 
  are 
  circular 
  at 
  

   the 
  base, 
  short 
  and 
  rather 
  flat 
  where 
  free, 
  and 
  which 
  are 
  separated 
  

   by 
  an 
  amount 
  of 
  surface 
  about 
  equal 
  to 
  their 
  breadth. 
  No 
  pores 
  

   exist. 
  Tube-openings 
  occur 
  on 
  the 
  granulations 
  ; 
  and 
  tubes, 
  with 
  

   or 
  without 
  openings, 
  converge 
  to 
  their 
  surface 
  and 
  cover 
  the 
  inter- 
  

   mediate 
  surface. 
  The 
  tubes 
  opening 
  onto 
  the 
  centre 
  of 
  the 
  surface 
  

   of 
  the 
  granulations 
  are 
  terminations 
  of 
  the 
  very 
  numerous 
  radial 
  

   series, 
  and 
  are 
  small 
  ; 
  and 
  the 
  others, 
  which 
  are 
  larger, 
  belong 
  to 
  

   the 
  closely 
  packed 
  varicose 
  and 
  much 
  contorted 
  interradial 
  series. 
  

   The 
  body 
  within 
  consists 
  of 
  a 
  vast 
  number 
  of 
  small, 
  not 
  very 
  conical, 
  

   but 
  rather 
  straight, 
  radial 
  series, 
  whose 
  rather 
  distant 
  tubes 
  give 
  off 
  

   minute 
  offshoots 
  to 
  the 
  surrounding 
  convoluted 
  and 
  varicose 
  large 
  

   tubes 
  of 
  the 
  close 
  interradial 
  series. 
  ]S"o 
  coenenchyma 
  can 
  be 
  dis- 
  

   covered. 
  

  

  The 
  species 
  Stoliczkaria 
  granulata, 
  mihi 
  *, 
  is 
  characterized 
  by 
  

   having 
  a 
  symmetrical 
  spheroidal 
  body, 
  and 
  by 
  the 
  minute 
  eminences 
  

   on 
  it 
  giving 
  a 
  granular 
  appearance 
  to 
  the 
  whole. 
  These 
  low 
  granula- 
  

   tions 
  (Plate 
  II. 
  fig. 
  1) 
  are 
  usually 
  circular 
  in 
  outline, 
  and 
  flat 
  normally 
  

   at 
  the 
  free 
  end, 
  and 
  they 
  merge 
  into 
  the 
  substance 
  of 
  the 
  periphery 
  

   at 
  their 
  base. 
  They 
  are 
  about 
  -^- 
  - 
  inch 
  in 
  breadth, 
  and 
  may 
  be 
  of 
  the 
  

   same 
  height. 
  Sometimes 
  the 
  bases 
  of 
  several 
  are 
  continuous, 
  and 
  a 
  

   ridge 
  is 
  formed. 
  In 
  a 
  few 
  places 
  the 
  granulation 
  is 
  absent; 
  but 
  a 
  

   circular 
  marking 
  denotes 
  its 
  former 
  position. 
  Rather 
  large 
  tubes 
  are 
  

   on 
  the 
  outside 
  and 
  flanks 
  of 
  the 
  granulations, 
  and 
  they 
  open 
  at 
  the 
  top 
  

   all 
  around 
  a 
  central 
  portion. 
  This 
  inner 
  or 
  central 
  part 
  of 
  the 
  pro- 
  

   jection 
  shows 
  the 
  ends 
  of 
  a 
  few 
  small 
  tubes 
  and 
  much 
  space 
  occupied 
  

   by 
  infiltrated 
  calcareous 
  matter. 
  The 
  large 
  outer 
  tubes 
  pass 
  down- 
  

   wards 
  onto 
  the 
  surface 
  of 
  the 
  body 
  between 
  the 
  projections, 
  and 
  dip 
  

   into 
  it 
  and 
  are 
  surrounded 
  by 
  a 
  number 
  of 
  open 
  tube-ends 
  and 
  occa- 
  

   sional 
  tube-reticulation. 
  When 
  a 
  projection 
  has 
  been 
  worn 
  off, 
  the 
  

   central 
  small 
  tubes 
  are 
  still 
  seen 
  on 
  the 
  surface 
  to 
  be 
  surrounded 
  

   by 
  a 
  ring 
  of 
  larger 
  ones 
  ; 
  and 
  between 
  the 
  positions 
  formerly 
  occu- 
  

   pied 
  in 
  this 
  manner 
  there 
  are 
  spaces 
  full 
  of 
  the 
  ends 
  of 
  large 
  tubes 
  

   passing 
  from 
  within 
  outwards 
  (Plate 
  II. 
  fig. 
  2). 
  

  

  Sections 
  of 
  the 
  body, 
  made 
  tangentially, 
  show 
  a 
  number 
  of 
  small, 
  

  

  * 
  Op. 
  cit. 
  p. 
  16, 
  

  

  