﻿134 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Distinguishing 
  characters. 
  Form 
  circular 
  or 
  cup-shaped 
  in 
  grow- 
  

   ing 
  state; 
  thin, 
  flat, 
  frequently 
  bifurcating 
  branches, 
  united 
  laterally 
  

   by 
  obliquely 
  transverse 
  filaments, 
  leaving 
  oblong 
  quadrangular 
  in- 
  

   terstices; 
  indented 
  or 
  obliauely 
  and 
  intermittently 
  striated 
  surfaces. 
  

  

  £.,_i(sSS*a:>.*j 
  

  

  Fig. 
  27 
  Diclyonema 
  retUuraie 
  

  

  Found" 
  rarely 
  in 
  the 
  lower 
  part 
  of 
  the 
  Rochester 
  shales 
  in 
  the 
  

   Niagara 
  section; 
  ustially 
  fragmentary. 
  Abundant 
  at 
  Lockport 
  and 
  

   elsewhere. 
  (Hall) 
  

  

  Genus 
  stromatopora 
  Goldfuss 
  

  

  [Ety.: 
  (TTp(bij.a, 
  a 
  covering; 
  -opo'^, 
  a 
  pore] 
  

  

  (1826. 
  Pctrc 
  facta 
  Gernianiac, 
  p. 
  22) 
  

  

  Skeleton 
  forming 
  hemispheric, 
  globular 
  or 
  expanded 
  masses 
  com- 
  

   posed 
  of 
  numerous 
  concentric, 
  undulating 
  calcareous 
  laminae, 
  separ- 
  

   ated 
  by 
  interspaces, 
  and 
  connected 
  by 
  radial 
  pillars 
  which 
  unite 
  

   with 
  the 
  thick 
  concentric 
  laminae 
  and 
  form 
  a 
  finely 
  reticulate 
  tissue, 
  

   visible 
  in 
  cross-section. 
  Traversing 
  the 
  entire 
  mass 
  are 
  sparsely 
  

   scattered 
  tubes 
  which 
  are 
  divided 
  by 
  numerous 
  tabulae 
  or 
  horizontal 
  

   floors, 
  and 
  were 
  occupied 
  by 
  the 
  larger 
  polyps 
  of 
  the 
  colony. 
  Base 
  

   of 
  entire 
  skeleton 
  covered 
  by 
  a* 
  wrinkled 
  " 
  epitheca 
  ". 
  

  

  Stromatopora 
  concentrica 
  Goldfuss 
  Hall 
  (Fig. 
  28) 
  (1852, 
  Pal. 
  

   N. 
  7.2:136, 
  pi. 
  37) 
  

  

  Distinguishing 
  characters. 
  Hemispheric 
  or 
  spheroidal 
  form 
  some- 
  

   times 
  irregular; 
  thin 
  concentric 
  laminae, 
  readily 
  visible 
  in 
  weathered 
  

   specimens, 
  and 
  scarcely 
  of 
  the 
  thickness 
  of 
  writing 
  paper; 
  surface 
  of 
  

   laminae 
  marked 
  by 
  fine 
  pores. 
  

  

  