﻿100 
  Twenty-eighth 
  Keport 
  ok 
  the 
  State 
  Museum. 
  

  

  Since 
  the 
  publication 
  of 
  the 
  original 
  paper, 
  a 
  series 
  of 
  the 
  

   specimens 
  therein 
  described 
  has 
  been 
  placed 
  in 
  the 
  State 
  

   Museum, 
  and 
  later 
  collections 
  have 
  enabled 
  us 
  to 
  increase 
  the 
  

   series, 
  so 
  as 
  to 
  include 
  not 
  only 
  all 
  the 
  species 
  of 
  this 
  paper, 
  

   but 
  to 
  add 
  a 
  considerable 
  number 
  of 
  new 
  forms, 
  the 
  de- 
  

   scriptions 
  of 
  which 
  are 
  now 
  being 
  printed 
  in 
  the 
  current 
  vol- 
  

   ume 
  (X) 
  of 
  the 
  Transactions 
  of 
  the 
  Albany 
  Institute. 
  

  

  These 
  new 
  forms, 
  with 
  some 
  additional 
  material 
  of 
  similar 
  

   character, 
  will 
  form 
  the 
  subject 
  of 
  a 
  supplementary 
  paper 
  in 
  

   a 
  future 
  report 
  of 
  the 
  State 
  Museum. 
  

  

  The 
  investigation 
  has 
  proved 
  an 
  interesting 
  one, 
  especially 
  

   as 
  an 
  aid 
  to 
  our 
  knowledge 
  of 
  the 
  geographical 
  distribution 
  

   of 
  the 
  Niagara 
  fauna. 
  

  

  In 
  the 
  Twentieth 
  Report 
  on 
  the 
  State 
  Cabinet 
  of 
  Nat. 
  

   Hist. 
  , 
  I 
  have 
  given 
  a 
  pretty 
  full 
  illustration 
  of 
  the 
  predomi- 
  

   nant 
  forms 
  of 
  this 
  fauna 
  as 
  represented 
  in 
  the 
  Niagara 
  forma- 
  

   tion 
  of 
  Wisconsin, 
  where 
  the 
  prevailing 
  rock 
  is 
  a 
  magnesian 
  

   limestone. 
  Dr. 
  F. 
  Roemer, 
  in 
  his 
  Silurische 
  Fauna 
  des 
  West- 
  

   lichen 
  Tennessee, 
  has 
  given 
  an 
  illustration 
  of 
  the 
  fauna 
  of 
  

   this 
  period 
  as 
  known 
  in 
  that 
  State. 
  To 
  these 
  publications 
  

   we 
  may 
  add 
  volume 
  II 
  of 
  the 
  Palaeontology 
  of 
  New 
  York, 
  

   which 
  illustrates 
  the 
  fauna 
  of 
  the 
  Niagara 
  period 
  in 
  its 
  typical 
  

   locality, 
  and 
  we 
  have 
  the 
  means 
  of 
  comparison 
  between 
  the 
  

   prevailing 
  forms 
  from 
  four 
  widely 
  separated 
  regions. 
  

  

  Comparing 
  the 
  collections 
  from 
  Waldron, 
  we 
  find 
  a 
  greater 
  

   proportion 
  of 
  species 
  identical 
  with 
  those 
  of 
  New 
  York 
  than 
  

   in 
  any 
  other 
  western 
  locality, 
  while 
  the 
  new 
  forms 
  are 
  of 
  the 
  

   same 
  genera, 
  and 
  often 
  quite 
  nearly 
  allied 
  to 
  those 
  of 
  the 
  

   Niagara 
  region. 
  It 
  is 
  a 
  little 
  remarkable, 
  however, 
  that 
  while 
  

   we 
  have 
  in 
  the 
  Indiana 
  locality, 
  twice 
  as 
  many 
  crinoidal 
  

   forms 
  as 
  in 
  New 
  York, 
  and 
  more 
  than 
  ten 
  times 
  as 
  many 
  

   individuals, 
  we 
  have 
  not 
  seen 
  a 
  single 
  specimen 
  of 
  Caryocri- 
  

   nus, 
  which 
  is 
  the 
  most 
  abundant 
  form 
  among 
  the 
  crinoidea 
  

   in 
  New 
  York, 
  occurring 
  also 
  in 
  Wisconsin 
  and 
  Iowa 
  quite 
  

   frequently, 
  and 
  is 
  more 
  abundant 
  in 
  Tennessee 
  than 
  in 
  any 
  of 
  

   the 
  other 
  localities. 
  The 
  physical 
  conditions 
  originally 
  existing 
  

   at 
  Waldron 
  were 
  more 
  similar 
  to 
  those 
  of 
  Western 
  New 
  York, 
  

   than 
  to 
  those 
  of 
  any 
  other 
  locality. 
  In 
  Wisconsin 
  and 
  Iowa, 
  

   the 
  outcrops 
  are 
  chiefly 
  of 
  magnesian 
  limestone, 
  and 
  the 
  Gas- 
  

   eropoda 
  and 
  Cephalopoda 
  predominate 
  over 
  other 
  forms, 
  

  

  