﻿NIAGARA 
  FALLS 
  AND 
  VICINITY 
  1 
  69 
  

  

  Phylloporina 
  asperato-striata 
  (Hall) 
  (Fig. 
  68). 
  Retepora 
  

   asperato-striata 
  Hall 
  (1852. 
  Pal. 
  N. 
  Y. 
  2:161, 
  pi. 
  40C, 
  

   fig. 
  2a-h) 
  

  

  Distinguishing 
  characters. 
  Network 
  of 
  anastomosing 
  branches, 
  

   with 
  oval 
  interstices 
  which 
  are 
  somewhat 
  unequal; 
  outer 
  face 
  

   roughly 
  striate; 
  inner 
  face 
  poriferous; 
  three, 
  four 
  or 
  more 
  rows 
  of 
  

   oval 
  or 
  subangular 
  cells 
  arranged 
  somewhat 
  in 
  oblique 
  parallel 
  lines 
  

   or 
  in 
  quincunx 
  order; 
  apertures 
  in 
  perfect 
  specimens 
  probably 
  with 
  

   peristomes. 
  

  

  Found 
  abundantly 
  in 
  the 
  Bryozoa 
  beds 
  of 
  the 
  Rochester 
  shale 
  at 
  

   Niagara. 
  Generally 
  adhering 
  to 
  the 
  shale 
  laminae 
  by 
  the 
  cellulifer- 
  

   ous 
  face. 
  Also 
  at 
  Lockport 
  (Hall). 
  

  

  Genus 
  drymotrypa 
  Ulrich 
  

   [Ety. 
  : 
  dpufj.o^, 
  coppice; 
  rpo-na, 
  perforation] 
  

  

  (1890. 
  Geol. 
  sur. 
  Illinois. 
  8 
  1399) 
  

  

  Zoarium 
  branching 
  dichotomously 
  at 
  frequent 
  intervals; 
  zooecia 
  

   in 
  several 
  ranges, 
  tubular, 
  opening 
  on 
  one 
  side 
  only 
  and 
  springing 
  

   from 
  a 
  thin 
  double 
  plate, 
  beneath 
  which 
  a 
  number 
  of 
  vesicles 
  are 
  

  

  

  

  Fig. 
  69 
  Drymotrypa 
  diffusa 
  with 
  celluliferous 
  and 
  non-celluliferous 
  sides 
  enlarged 
  

  

  present; 
  reverse 
  side 
  longitudinally 
  striated; 
  vestibules 
  expanding 
  

   from 
  the 
  orifices 
  to 
  the 
  angular 
  apertures. 
  

  

  Drymotrypa 
  diffusa 
  (Hall) 
  (Fig. 
  69) 
  Retepora 
  diffusa 
  

   Hall 
  (1852. 
  Pal. 
  N. 
  Y. 
  2 
  :i6o, 
  pi. 
  40C, 
  fig. 
  la-f) 
  

  

  Distinguishing 
  characters. 
  Shrubby 
  form, 
  several 
  stems 
  originat- 
  

   ing 
  from 
  a 
  common 
  base; 
  stems 
  frequently 
  bifurcating 
  and 
  spread- 
  

   ing 
  laterally, 
  forming 
  a 
  broad 
  frond; 
  stems 
  and 
  branches 
  cellulifer- 
  

  

  