﻿108 
  Twenty-eighth 
  Eeport 
  on 
  the 
  State 
  Museum. 
  

  

  spreads 
  over 
  a 
  considerable 
  extent 
  of 
  surface, 
  and 
  in 
  other 
  

   examples 
  the 
  calyces 
  are 
  crowded 
  and 
  grow 
  nearly 
  directly 
  

   upwards, 
  attaining 
  an 
  elevation 
  above 
  the 
  attached 
  base 
  of 
  

   three 
  to 
  five 
  millimetres. 
  In 
  the 
  procumbent 
  forms 
  the 
  dist- 
  

   ance 
  between 
  the 
  budding 
  is 
  about 
  four 
  to 
  five 
  millimetres, 
  the 
  

   diameter 
  of 
  the 
  tube 
  at 
  its 
  origin 
  is 
  less 
  than 
  one 
  millimetre, 
  the 
  

   aperture 
  including 
  the 
  exterior 
  walls 
  being 
  about 
  two 
  milli- 
  

   metres. 
  

  

  This 
  species 
  bears 
  some 
  resemblance, 
  in 
  its 
  mode 
  of 
  growth, 
  

   to 
  the 
  Aulopora 
  Schoharice, 
  but 
  is 
  a 
  stouter 
  species, 
  except 
  

   in 
  rare 
  examples 
  where 
  the 
  tubes 
  are 
  more 
  slender 
  than 
  in 
  the 
  

   prevailing 
  forms. 
  

  

  FAYOSITES 
  Lamarck. 
  

   Favosites 
  spinigeeus. 
  

  

  Plate 
  4, 
  Figs. 
  1-5. 
  

  

  Favosites 
  Niagarensis 
  var. 
  spinigera 
  Hall. 
  Doc. 
  Edit. 
  28th 
  Rep. 
  St. 
  Mus. 
  

  

  Nat. 
  Hist. 
  Explanation 
  of 
  pi. 
  4, 
  figs. 
  1-5. 
  1876. 
  

   Favosites 
  excretus 
  Hall. 
  Doc. 
  Edit. 
  28th 
  Rep. 
  St. 
  Mus. 
  Nat. 
  Hist. 
  Explanation 
  

  

  of 
  pi. 
  9, 
  figs. 
  1 
  and 
  2. 
  1876. 
  

   Favosites 
  spongilla 
  Romestger. 
  Fossil 
  Corals, 
  page 
  24 
  ; 
  reference 
  under 
  the 
  head 
  

  

  of 
  Favosites 
  pyriformis, 
  1876. 
  

  

  Form 
  hemispheric 
  or 
  pyriform, 
  often 
  spreading 
  and 
  becom- 
  

   ing 
  lobed 
  above. 
  Tubes 
  small, 
  ranging 
  from 
  one 
  to 
  one 
  and 
  a 
  

   half 
  mm., 
  the 
  lateral 
  walls 
  with 
  radiating 
  spinulse 
  ; 
  dia- 
  

   phragms 
  essentially 
  flat, 
  mural 
  pores 
  not 
  determined, 
  cell-aper- 
  

   tures 
  irregularly 
  margined 
  by 
  spiniform 
  processes. 
  

  

  This 
  small 
  species 
  occurs 
  in 
  subhemispheric 
  forms 
  of 
  from 
  

   ten 
  to 
  twenty-five 
  mm. 
  in 
  diameter 
  and 
  of 
  somewhat 
  less 
  ele- 
  

   vation 
  ; 
  it 
  also 
  assumes 
  pyriform 
  shapes 
  of 
  similar 
  dimensions, 
  

   often 
  becoming 
  expanded 
  and 
  variously 
  lobed 
  above. 
  The 
  

   apertures 
  of 
  the 
  cells, 
  as 
  usually 
  presented, 
  are 
  extremely 
  vari- 
  

   able 
  in 
  size, 
  and 
  there 
  is 
  not 
  unfrequently 
  a 
  group 
  of 
  smaller 
  

   cells 
  arranged 
  around 
  a 
  larger 
  one, 
  and 
  in 
  the 
  irregular 
  mode 
  

   of 
  growth 
  the 
  margins 
  become 
  free 
  and 
  more 
  or 
  less 
  curved. 
  

   In 
  rare 
  examples 
  the 
  apertures 
  are 
  free, 
  rounded, 
  and 
  a 
  little 
  

   dilated, 
  while 
  on 
  the 
  margins 
  of 
  the 
  mass 
  the 
  tubes 
  are 
  sub- 
  

   cylindrical 
  with 
  individual 
  epithecse. 
  In 
  such 
  forms 
  the 
  aper- 
  

   tures 
  present 
  an 
  appearance 
  as 
  of 
  one 
  cell 
  budding 
  from 
  the 
  

   calyx 
  of 
  another, 
  but 
  this 
  aspect 
  is 
  probably 
  due 
  to 
  a 
  thicken- 
  

   ing 
  of 
  the 
  cell-wall 
  or 
  of 
  an 
  abrupt 
  contraction 
  of 
  growth. 
  

  

  In 
  specimens 
  where 
  the 
  aperture 
  is 
  expanded, 
  the 
  dia- 
  

   phragms, 
  visible 
  from 
  above, 
  are 
  convex 
  with 
  a 
  little 
  boss 
  in 
  

   the 
  center. 
  

  

  