﻿CLASSIFICATION, 
  ETC. 
  OP 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  327 
  

  

  impossible. 
  In 
  point 
  of 
  size, 
  however, 
  it 
  would 
  correspond 
  to 
  a 
  

   young 
  individual 
  of 
  D. 
  tuberculatus 
  from 
  the 
  Chemung. 
  No 
  

   species 
  of 
  Dinichthys 
  has 
  yet 
  been 
  described 
  from 
  the 
  Catskill, 
  

   and 
  it 
  is 
  therefore 
  to 
  be 
  hoped 
  that 
  further 
  material 
  of 
  this 
  

   nature 
  may 
  be 
  forthcoming. 
  

  

  Locality; 
  Kaaterskill 
  creek 
  above 
  Palenville. 
  

  

  Family 
  Holoptychidae 
  

  

  Genus 
  holoptychius 
  

  

  HploptycJiiiis 
  americanus 
  Leidy 
  

  

  Scales 
  of 
  this 
  species 
  are 
  quite 
  abundant 
  in 
  the 
  Catskills, 
  and 
  

   Were 
  obtained 
  in 
  considerable 
  numbers 
  from 
  the 
  same 
  locality 
  

   as 
  Onchus 
  and 
  Bothriolepis, 
  i. 
  e. 
  from 
  the 
  tmtario 
  and 
  Western 
  

   railroad 
  tunnel 
  between 
  Murickville 
  and 
  North 
  Walton, 
  in 
  Dela- 
  

   ware 
  CO. 
  

  

  Associated 
  with 
  the 
  above 
  were 
  several 
  specimens 
  illustrative 
  

   of 
  the 
  scales 
  and 
  bone-fragments 
  of 
  some 
  unknown 
  fish, 
  probably 
  

   of 
  crossopterygian 
  nature. 
  The 
  scales 
  are 
  about 
  2 
  cm 
  in 
  diame- 
  

   ter, 
  and 
  somewhat 
  elliptic 
  in 
  outline. 
  The 
  external 
  surface 
  is 
  

   smooth 
  without 
  being 
  either 
  polished 
  or 
  enameled, 
  and 
  under 
  a 
  

   lens 
  is 
  seen 
  to 
  be 
  covered 
  with 
  innumerable 
  minute 
  conical 
  gran- 
  

   ules. 
  The 
  latter 
  are 
  hollow, 
  and 
  consequently 
  appear 
  as 
  pores 
  

   on 
  abraded 
  or 
  fractured 
  specimens. 
  The 
  thickness 
  of 
  the 
  scales 
  

   varies 
  between 
  1 
  and 
  1.5 
  mm, 
  and 
  the 
  under 
  surface 
  of 
  some 
  

   bears 
  a 
  prominent 
  articulating 
  ridge. 
  The 
  generic 
  and 
  even 
  

   family 
  position 
  of 
  these 
  objects 
  must 
  be 
  regarded 
  for 
  the 
  present 
  

   as 
  indeterminable. 
  

  

  Locality; 
  same 
  as 
  preceding. 
  

  

  