﻿164 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Chilotrypa 
  ostiolata 
  (Hall) 
  (Fig. 
  60). 
  Trematopora 
  os- 
  

   t 
  i 
  6 
  1 
  a 
  t 
  a 
  Hall 
  (1852. 
  Pal. 
  N. 
  Y. 
  2 
  1152, 
  pi. 
  40A, 
  fig. 
  5a-n) 
  

  

  Distinguishing 
  characters. 
  Irregularly 
  branching 
  cylindric 
  stems 
  

   gradually 
  tapering 
  toward 
  the 
  extremities, 
  which 
  are 
  obtuse; 
  aper- 
  

  

  /^: 
  

  

  /^> 
  

  

  ^, 
  -.-';''■^ 
  

  

  -i 
  . 
  ^-'^'i 
  

  

  \% 
  ^-'^^ 
  

  

  U 
  i 
  * 
  ^'^ 
  M 
  

  

  y^4 
  

  

  

  Fig. 
  60 
  Chilotrypa 
  ostiolata 
  ; 
  branch 
  natural 
  size 
  and 
  two 
  enlargements 
  

  

  tures 
  about 
  their 
  diameter 
  apart, 
  arranged 
  in 
  spirally 
  ascending 
  

   lines 
  or 
  irregularly; 
  strong 
  peristomes; 
  interapertural 
  spaces 
  smooth; 
  

   stems 
  soHd 
  or 
  incrusting 
  crinoids. 
  

  

  Found 
  abundantly 
  in 
  the 
  Bryozoa 
  beds 
  of 
  the 
  Rochester 
  shale 
  

  

  and 
  in 
  some 
  of 
  the 
  calcareous 
  layers 
  

   below 
  it 
  in 
  the 
  Niagara 
  sections. 
  

   .#. 
  .1 
  Also 
  at 
  Lockport, 
  etc. 
  (Hall). 
  

  

  'C'^, 
  

  

  Fig 
  fil 
  Batostomella 
  granulifera 
  with 
  en 
  

   largement 
  of 
  part 
  of 
  surface 
  

  

  Genus 
  batostomella 
  Ulrich 
  

  

  [Ety.: 
  jSarug, 
  bramble; 
  aroiia, 
  mouth] 
  

  

  (1882. 
  Cin. 
  soc. 
  nat. 
  hist. 
  Jour. 
  5:154) 
  

  

  Zoarium 
  ramose, 
  branches 
  slen- 
  

   der; 
  zooecia 
  with 
  thick 
  walls 
  in 
  the 
  

   mature 
  region 
  and 
  with 
  few 
  diaphragms 
  in 
  the 
  peripheral 
  region, 
  

   often 
  centrally 
  perforated; 
  apertures 
  small, 
  circular 
  or 
  oval; 
  inter- 
  

   spaces 
  rounded 
  or 
  canaliculate, 
  spinulose; 
  acanthopores 
  small 
  and 
  

   usually 
  very 
  numerous 
  ; 
  mesopores 
  small, 
  with 
  subcircular 
  openings. 
  

  

  Batostomella 
  granulifera 
  (Hall) 
  (Fig. 
  61). 
  Trematopo'ra 
  

   granulifera 
  Hall 
  (1852.- 
  Pal. 
  N. 
  Y. 
  2 
  :i54, 
  pk 
  40A, 
  fig- 
  9a-e) 
  

  

  Distinguishing 
  characters. 
  Slender 
  branches; 
  oval 
  to 
  elongate 
  

   apertures, 
  margined 
  by 
  wavy, 
  raised, 
  granulose 
  hues, 
  which 
  are 
  

   double 
  between 
  the 
  cells. 
  

  

  