﻿NIAGARA 
  FALLS 
  AND 
  VICINITY 
  22$ 
  

  

  margin 
  obliquely 
  inward 
  to 
  the 
  eyes, 
  and 
  thence 
  almost 
  directly 
  for- 
  

   ward, 
  cutting 
  the 
  margin 
  separately. 
  Thorax 
  with 
  nine 
  or 
  lo 
  seg- 
  

   ments 
  and 
  grooved 
  and 
  falcate 
  pleurae. 
  Pygidium 
  large 
  and 
  flat^ 
  

   the 
  segments 
  commonly 
  ending 
  in 
  spinous 
  prolongations. 
  Doub- 
  

   lure 
  very 
  broad. 
  

  

  Lichas 
  boltoni 
  (Bigsby) 
  (Plate 
  17) 
  (Hall. 
  1852. 
  Pal. 
  N. 
  F. 
  

   2:3ii,pl. 
  69, 
  70) 
  

  

  Distinguishing 
  characters. 
  Large 
  size; 
  nasute 
  anterior 
  end; 
  

   large 
  central 
  and 
  oblique 
  lateral 
  lobes 
  of 
  glabella; 
  scabrous 
  surface 
  

   with 
  backward 
  directed 
  acute 
  pustules; 
  strongly 
  striated 
  doublure; 
  

   three 
  broad 
  lateral 
  lobes 
  of 
  pygidium, 
  contracting 
  to 
  angular 
  ter- 
  

   minations. 
  

  

  Found 
  in 
  the 
  lower 
  Rochester 
  shale 
  at 
  Niagara. 
  Rare 
  and 
  in 
  

   fragments. 
  Common 
  at 
  Lockport 
  and 
  elsewhere 
  (Hall). 
  

  

  Genus 
  encrinurus 
  Emmrich 
  

  

  [Ety. 
  : 
  encrinus; 
  oupd 
  ^=t3.il 
  (from 
  the 
  resemblance 
  of 
  the 
  py- 
  

   gidium 
  to 
  a 
  crinoid 
  stem)] 
  

  

  (1845. 
  ^^(^^ies 
  Jahrb. 
  p. 
  42) 
  

  

  Cephaion 
  narrow, 
  wider 
  than 
  long, 
  tuberculated; 
  glabella 
  pyri- 
  

   form, 
  prominent; 
  free 
  cheeks 
  narrow, 
  separated 
  in 
  front; 
  eyes 
  small, 
  

   elevated, 
  on 
  conic 
  prominences. 
  Thoracic 
  segments 
  11. 
  Pygidium 
  

   triangular, 
  with 
  numerous 
  segments. 
  

  

  Encrinurus 
  ornatus 
  Hall 
  & 
  Whitfield 
  

   (Fig. 
  1 
  57). 
  Cybele 
  punctata 
  

   Hall 
  (1852. 
  Pal. 
  N. 
  Y. 
  2:297, 
  pi. 
  A66) 
  

  

  Distinguishing 
  characters. 
  Strongly 
  

   pustulose 
  surface 
  of 
  cephaion 
  ; 
  pyriform 
  

   glabella; 
  elongate 
  triangular 
  pygidium, 
  

  

  , 
  , 
  . 
  , 
  , 
  . 
  , 
  Fig. 
  157 
  Encrinurus 
  ornatus 
  

  

  With 
  concavity 
  along 
  the 
  center 
  01 
  the 
  

  

  axis, 
  tuberculated 
  at 
  intervals; 
  slender 
  curving 
  ridges 
  of 
  pygidial 
  

  

  limb, 
  tuberculated 
  at 
  intervals. 
  

  

  Found 
  in 
  the 
  lower 
  Clinton 
  limestone 
  at 
  Niagara. 
  Rare. 
  Also 
  

   at 
  Lockport 
  (Hall). 
  

  

  