﻿224 
  NEW 
  YORK 
  STATE! 
  MUSEUM 
  

  

  Dalmanites 
  limulurus 
  (Green) 
  (Fig. 
  155). 
  Phacops 
  limu- 
  

   lurus 
  Hall 
  (1852. 
  Fa/. 
  A^. 
  F. 
  2:303, 
  pi. 
  67) 
  

  

  Distinguishing 
  characters. 
  Sublunate 
  form 
  of 
  cephalon, 
  pointed 
  

   anteriorly; 
  large 
  slender 
  genal 
  spines; 
  broad 
  anterior 
  and 
  narrow 
  

   posterior 
  lobes 
  of 
  glabella; 
  pygidium 
  with 
  15 
  axial 
  rings, 
  and 
  a 
  long, 
  

   strong 
  mucronate 
  spine. 
  

  

  Found 
  rarely 
  in 
  the 
  lower 
  and 
  middle 
  but 
  abundantly 
  in 
  the 
  upper 
  

   Rochester 
  shales 
  at 
  Niagara. 
  Also 
  at 
  Lockport 
  and 
  elsewhere 
  

   ^(Hall). 
  

  

  Genus 
  calymmene 
  Brongt. 
  

  

  [Ety. 
  : 
  y.exaXofj.fjJyo?, 
  concealed] 
  

  

  (1822. 
  Hist. 
  nat. 
  coriist. 
  foss. 
  p. 
  7) 
  

  

  Body 
  oval 
  in 
  outline, 
  readily 
  enrolled; 
  cephalon 
  wider 
  than 
  long; 
  

   glabella 
  narrowing 
  anteriorly, 
  conic, 
  strongly 
  convex, 
  divided 
  by 
  

   three 
  pairs 
  of 
  deep 
  glabellar 
  furrows. 
  Facial 
  sutures 
  extending 
  

   from 
  just 
  in 
  front 
  of 
  the 
  genal 
  angles, 
  converging 
  forward 
  around 
  

   the 
  eyes 
  and 
  reaching 
  the 
  anterior 
  margin 
  separately. 
  Eyes 
  small; 
  

  

  thorax 
  of 
  13 
  segments, 
  with 
  deep 
  axial 
  furrows; 
  

  

  pygidium 
  from 
  six 
  to 
  11 
  segments 
  not 
  distinctly 
  

  

  marked 
  of¥ 
  from 
  the 
  thorax. 
  

  

  Calymmene 
  blumenbachi 
  niagarensis 
  Hall 
  (Fig. 
  

   156) 
  (1852. 
  Fa/. 
  A^. 
  F. 
  2 
  1307, 
  pi. 
  67) 
  

  

  Distinguishing 
  characters. 
  Semicircular 
  out- 
  

   line 
  of 
  cephalon; 
  glabellar 
  lobes 
  tuberculiform 
  ; 
  

   general 
  tapering 
  form 
  of 
  thorax; 
  axis 
  of 
  pygi- 
  

   dium 
  with 
  about 
  eight 
  rings; 
  limb 
  grooved 
  nearly 
  

  

  Fig. 
  156 
  Calymmene 
  

  

  blumenbachi 
  niagarensis 
  ^^ 
  margin, 
  which 
  is 
  thickcncd 
  and 
  rounded 
  

   posteriorly. 
  

  

  Found 
  rarely 
  in 
  the 
  Clinton 
  limestone 
  lenses, 
  and 
  the 
  lower 
  

   Rochester 
  shale 
  at 
  Niagara. 
  Also 
  at 
  Lockport 
  (Hall). 
  

  

  Genus 
  lichas 
  Dalman 
  

  

  [Ety.: 
  mythologic 
  name] 
  

  

  {1826. 
  Ueher 
  die 
  Palaeaden, 
  p. 
  71) 
  

  

  Trilobites 
  with 
  large 
  and 
  flat 
  granulated 
  shell. 
  Cephalon 
  small, 
  

   with 
  spinous 
  genal 
  angles; 
  glabella 
  broad, 
  with 
  a 
  large, 
  tumid 
  an- 
  

   terior 
  lobe, 
  which 
  dominates 
  the 
  smaller 
  reniform 
  lateral 
  lobes 
  on 
  

   each 
  side; 
  eyes 
  small; 
  facial 
  suture 
  extending 
  from 
  the 
  posterior 
  

  

  ■-') 
  

  

  