﻿/^■^-^ 
  

  

  

  NIAGARA 
  FALLS 
  AND 
  VICINITY 
  I75 
  

  

  monticules, 
  and 
  traversed 
  by 
  slender, 
  rounded, 
  bifurcating 
  ridges, 
  

   which 
  appear 
  as 
  shallow 
  grooves 
  when 
  the 
  surface 
  is 
  worn; 
  aper- 
  

   tures 
  nearly 
  circular, 
  occupying 
  the 
  summits 
  of 
  prominent 
  papillae; 
  

   mesopores 
  present, 
  but 
  closed 
  at 
  the 
  surface 
  ; 
  large 
  median 
  tubuli 
  in 
  

   the 
  middle 
  layer 
  or 
  mesotheca. 
  

  

  Rhinopora 
  tuberculosa 
  Hall 
  (Fig. 
  yy) 
  (1852. 
  Pal. 
  N. 
  Y. 
  2:170, 
  

   pi. 
  40E, 
  fig. 
  4a-c) 
  

  

  Distingiiishi)ig 
  characters. 
  Lamellose 
  or 
  explanate 
  palmate 
  

   fronds; 
  asperate 
  and 
  tubercu- 
  ^^^ 
  

  

  lous 
  surface; 
  tubercles 
  mostly 
  

   destitute 
  of 
  cells 
  at 
  the 
  sum- 
  

   mit; 
  cells 
  rising 
  in 
  pustules 
  on 
  - 
  --k, 
  tvl 
  ' 
  

   the 
  surface 
  and 
  opening 
  by 
  '^^- 
  - 
  > 
  

  

  roundish 
  oval 
  or 
  tripetaloUS 
  Fig. 
  77 
  Rhmopora 
  tubercolosa 
  with 
  enlargement 
  

  

  apertures. 
  

  

  Found 
  in 
  the 
  Rochester 
  shale 
  at 
  Lockport 
  (Hall) 
  and 
  probably 
  

   also 
  at 
  Niagara. 
  

  

  Genus 
  diamesopora 
  Hall 
  

  

  [Ety.: 
  did, 
  through; 
  //i^-oc, 
  middle; 
  -6f)<>i, 
  pore] 
  

  

  (1852. 
  Pal. 
  N. 
  y. 
  2:158) 
  

  

  Zoarium 
  ramose, 
  of 
  hollow 
  stems 
  lined 
  internally 
  by 
  an 
  epitheca; 
  

   zooecia 
  simple, 
  hexagonal, 
  or 
  rhomboidal, 
  with 
  an 
  oval 
  orifice 
  in 
  

  

  the 
  anterior 
  half, 
  which, 
  with 
  

   I 
  growth, 
  forms 
  a 
  tubular 
  vestibule; 
  

   ' 
  aperture 
  with 
  peristomes 
  equally 
  

   elevated 
  or 
  highest 
  posteriorly; 
  

   \ 
  I 
  intervestibular 
  spaces 
  compact 
  or 
  

  

  ^- 
  ^Ji 
  / 
  horizontally 
  laminated. 
  

   ^ 
  / 
  , 
  \ 
  Diamesopora 
  dichotoma 
  Hall 
  

  

  > 
  (Fig. 
  78) 
  (1852. 
  Pal. 
  N. 
  Y. 
  

   ;:; 
  ' 
  ' 
  2:158, 
  pi. 
  40B, 
  fig. 
  3a-d) 
  

  

  Distinguishing 
  characters. 
  Cy- 
  

   lindric, 
  hollow, 
  regularly 
  bifurcat- 
  

   ^- 
  .^J 
  i^g" 
  stems 
  (a 
  thin 
  crust 
  inclosing 
  

  

  inorganic 
  matter) 
  ; 
  interior 
  of 
  hoi- 
  

   Fig. 
  78 
  Diamesopora 
  dichotoma 
  with 
  enlarge- 
  

  

  ™®^* 
  low 
  branches 
  transversely 
  striate; 
  

  

  cells 
  opening 
  upward 
  in 
  regular 
  ascending 
  or 
  spiral 
  hues; 
  promi- 
  

   nent 
  nariform 
  peristomes 
  ; 
  stems 
  usually 
  flattened. 
  

  

  Found 
  in 
  the 
  Bryozoa 
  beds 
  of 
  the 
  Rochester 
  shales 
  at 
  Niagara, 
  

   usually 
  in 
  a 
  crushed 
  condition. 
  Also 
  at 
  Lockport 
  (Hah). 
  

  

  