﻿The 
  Fa 
  uk 
  a 
  of 
  the 
  Niagaka 
  Group. 
  187 
  

  

  CALYMENE 
  Brongniart. 
  

   Calymene 
  Niagarensis. 
  

  

  Plate 
  32, 
  Figs. 
  8-15. 
  

  

  Calymene 
  Niagarensis 
  Hall. 
  Geol. 
  N. 
  Y. 
  Surv. 
  4th 
  Geolog. 
  Dist., 
  p. 
  101, 
  fig. 
  3, 
  

  

  and 
  p. 
  102. 
  1843. 
  

   Calymene 
  Blumenbachii 
  var. 
  Niagarensis 
  Hall. 
  Pal. 
  N. 
  Y., 
  vol.]ii, 
  p. 
  307, 
  pi. 
  67, 
  

  

  figs. 
  11 
  and 
  12. 
  1852. 
  

   Calymene 
  Niagarensis 
  Hall. 
  20th 
  Rep. 
  St. 
  Cab. 
  Nat. 
  Hist., 
  p. 
  400; 
  Rev. 
  Edit., 
  p. 
  

  

  425. 
  For 
  synonymy 
  of 
  the 
  species, 
  see 
  Pal. 
  N. 
  Y., 
  vol. 
  ii. 
  p. 
  307. 
  

  

  This 
  species 
  is 
  the 
  most 
  abundant 
  form 
  among 
  the 
  trilobites 
  

   of 
  .the 
  Waldron 
  locality. 
  The 
  specimens 
  present 
  no 
  modifi- 
  

   cation 
  of 
  characters 
  from 
  those 
  in 
  the 
  Niagara 
  shale 
  of 
  New 
  

   York, 
  although 
  they 
  are 
  usually 
  of 
  larger 
  size. 
  A 
  large 
  pro- 
  

   portion 
  of 
  the 
  individuals 
  in 
  the 
  earlier 
  collections, 
  are 
  

   fragmentary, 
  having 
  been 
  macerated 
  upon 
  the 
  sea 
  bottom 
  be- 
  

   fore 
  they 
  were 
  covered 
  by 
  the 
  sediments. 
  In 
  the 
  collections 
  

   recently 
  made 
  are 
  several 
  individuals 
  which 
  preserve 
  all 
  the 
  

   parts 
  entire. 
  

  

  This 
  species 
  is 
  associated 
  with 
  Cyphaspis, 
  Homalonotus, 
  

   Illjenus, 
  Liohas 
  and 
  Dalmanites. 
  

  

  HOMALONOTUS 
  Konig. 
  

   Homalonotus 
  delphinocephalug 
  [Green). 
  

  

  Plate 
  32, 
  Figs. 
  17, 
  18. 
  

  

  Trimerus 
  delphinocephalus 
  Green. 
  Monograph 
  of 
  Trilobites, 
  p. 
  82, 
  pi. 
  1, 
  fig. 
  1. 
  

   1832. 
  For 
  synonymy 
  and 
  other 
  references, 
  see 
  Pal. 
  N. 
  Y., 
  vol. 
  ii, 
  p. 
  309. 
  

  

  This 
  species 
  occurs 
  at 
  the 
  Waldron 
  locality, 
  mostly 
  in 
  a 
  

   fragmentary 
  condition. 
  One 
  specimen 
  preserving 
  the 
  head 
  

   and 
  thorax 
  nearly 
  entire 
  has 
  been 
  observed. 
  Exclusive 
  of 
  this 
  

   specimen, 
  the 
  species 
  is 
  only 
  represented 
  by 
  fragments 
  of 
  the 
  

   cephalic 
  and 
  caudal 
  shields. 
  These 
  portions 
  of 
  the 
  fossil 
  bear 
  

   all 
  the 
  characteristic 
  marks 
  of 
  identity 
  with 
  those 
  from 
  the 
  

   Niagara 
  shale 
  in 
  New 
  York. 
  

  

  