﻿NIAGARA 
  FALLS 
  AND 
  VICINITY 
  1 
  63 
  

  

  cia 
  tubular, 
  radiating 
  on 
  the 
  upper 
  surface 
  from 
  a 
  depressed 
  center; 
  

   apertures 
  oblique, 
  imbricating, 
  provided 
  with 
  a 
  lunarium 
  ; 
  mesopores 
  

   short, 
  irregular, 
  decreasing 
  in 
  number 
  from 
  center 
  to 
  margin 
  ; 
  large 
  

   maculae 
  or 
  clusters 
  of 
  mesopores 
  or 
  of 
  zooecia 
  at 
  regular 
  intervals. 
  

  

  Ceramopora 
  imbricata 
  Hall 
  (Fig. 
  58) 
  (1852. 
  Pal 
  N. 
  Y. 
  2:169, 
  

   pi. 
  40E, 
  fig. 
  la-i) 
  

  

  Distinguishing 
  characters. 
  Depressed 
  hemispheric 
  form, 
  flattened 
  

   or 
  convex 
  on 
  the 
  lower 
  side; 
  composed 
  of 
  cylindric 
  or 
  subcylindric 
  

   tubes 
  slightly 
  diverging 
  from 
  the 
  cen- 
  

   ter, 
  rectangular 
  to 
  plane 
  of 
  upper 
  sur- 
  <i^^ 
  ^ 
  i 
  

   face; 
  arched 
  or 
  triangular 
  aperture, 
  

   opening 
  on 
  all 
  sides 
  toward 
  the 
  outer 
  

   margin, 
  arranged 
  in 
  alternating 
  and 
  ^ 
  

   imbricating 
  series. 
  

  

  Fif?. 
  53 
  Ceramopora 
  imbricata 
  with 
  en- 
  

  

  Found 
  in 
  the 
  Rochester 
  shale 
  at 
  i^'fe'""eiit 
  of 
  surface 
  

   Lockport 
  (Hall) 
  and 
  probably 
  also 
  at 
  Niagara. 
  

  

  Ceramopora 
  incrustans 
  Flail 
  (Fig. 
  59) 
  (1852. 
  Pal. 
  N. 
  Y. 
  2:169, 
  

   pi. 
  40E, 
  fig. 
  2a-d) 
  

  

  Distinguishing 
  characters. 
  Incrusting 
  

   r-^ 
  r 
  ^ 
  . 
  habit 
  ; 
  cells 
  increasing 
  unequally 
  from 
  a 
  

   ! 
  center 
  or 
  point 
  of 
  growth, 
  short, 
  minute, 
  

  

  ~"' 
  " 
  ' 
  ' 
  opening 
  obliquely 
  outward 
  and 
  arranged 
  

  

  Fig. 
  59 
  ceramopora 
  incrustans 
  with 
  ^^ 
  quiuCUUX 
  Order, 
  

   enlargement 
  of 
  surface 
  -r^ 
  i-.i-r>i^ 
  11 
  ^ti 
  

  

  round 
  m 
  the 
  Rochester 
  shale 
  at 
  Lock- 
  

   port 
  (Hall); 
  may 
  also 
  occur 
  at 
  Niagara. 
  

  

  Genus 
  chilotrypa 
  Ulrich 
  

  

  [Ety. 
  : 
  yXilo^, 
  lip; 
  rpoTza, 
  perforation] 
  

  

  (1884. 
  Cin. 
  soc. 
  nat. 
  hist. 
  Jour, 
  y 
  :49) 
  

  

  Zoarium 
  small, 
  branching, 
  with 
  a 
  narrow, 
  irregularly 
  contracting 
  

   and 
  expanding 
  tube; 
  zooecial 
  tubes 
  cylindric 
  or 
  somewhat 
  com- 
  

   pressed, 
  thin 
  walled, 
  with 
  or 
  without 
  diaphragms; 
  walls 
  minutely 
  

   porous; 
  apertures 
  elliptic, 
  oblique, 
  the 
  lower 
  margin 
  thickened 
  and 
  

   elevated; 
  at 
  irregular 
  intervals 
  maculae 
  or 
  monticules, 
  composed 
  of 
  

   clusters 
  of 
  vesicles 
  and 
  of 
  zooecia 
  slightly 
  larger 
  than 
  the 
  average 
  

   occur; 
  interzooecial 
  spaces 
  occupied 
  by 
  vesicular 
  tissue, 
  which 
  is 
  

   commonly 
  filled 
  by 
  a 
  dense 
  calcareous 
  deposit 
  near 
  the 
  surface. 
  

  

  