﻿324 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  extending 
  upwards 
  and 
  backwards, 
  but 
  there 
  is 
  no 
  very 
  sharp 
  

   demarcation 
  between 
  the 
  base 
  and 
  the 
  exserted 
  portion. 
  Neither 
  

   the 
  spine 
  itself 
  nor 
  its 
  impression 
  in 
  counterpart 
  show 
  any 
  traces 
  

   of 
  posterior 
  denticles, 
  a 
  fact 
  which 
  serves 
  to 
  exclude 
  it 
  from 
  the 
  

   genus 
  Hoplonchus, 
  and 
  justifies 
  the 
  present 
  determination. 
  The 
  

   general 
  form 
  is 
  comparable 
  with 
  that 
  of 
  0. 
  murchisoni, 
  but 
  is 
  

   more 
  rectilinear; 
  and 
  in 
  ornamentation 
  there 
  is 
  a 
  strong 
  resem- 
  

   blance 
  to 
  0. 
  tenuisiriatus. 
  Both 
  of 
  these 
  species 
  persist 
  as 
  late 
  as 
  

   the 
  lower 
  old 
  red 
  sandstone, 
  but 
  no 
  Devonian 
  species 
  of 
  Onchus 
  

   has 
  as 
  yet 
  been 
  described 
  from 
  this 
  country. 
  

  

  Locality; 
  Ontario 
  and 
  Western 
  railroad 
  tunnel 
  between 
  Murick- 
  

   ville 
  and 
  North 
  Walton, 
  Delaware 
  co. 
  

  

  Family 
  Asterolepidae 
  

  

  Genus 
  bothriolepis 
  

  

  Bothriolepis 
  leidyi 
  Newberry 
  (?) 
  

  

  Though 
  this 
  is 
  a 
  characteristic 
  Catskill 
  species, 
  all 
  the 
  re- 
  

   mains 
  of 
  Bothriolepis 
  in 
  the 
  collection 
  are 
  assignable 
  to 
  B. 
  minor 
  

   with 
  one 
  exception, 
  which 
  may 
  be 
  somewhat 
  doubtfully 
  referred 
  

   (.o 
  B. 
  leidyi. 
  This 
  specimen 
  is 
  so 
  abraded 
  as 
  to 
  render 
  an 
  accurate 
  

   determination 
  impossible, 
  but 
  the 
  ornament 
  is 
  certainly 
  sug- 
  

   gestive 
  of 
  B. 
  leidyi, 
  though 
  on 
  the 
  other 
  hand 
  the 
  thickness 
  of 
  the 
  

   plate 
  is 
  excessive 
  for 
  that 
  form. 
  The 
  identification 
  must 
  there- 
  

   fore 
  be 
  regarded 
  as 
  provisional 
  only. 
  

  

  Locality; 
  same 
  as 
  preceding. 
  

  

  Bothriolepis 
  minor 
  Newberry 
  

  

  This 
  species 
  has 
  heretofore 
  been 
  supposed 
  to 
  be 
  confined 
  to 
  the 
  

   Chemung 
  group, 
  but 
  Prof. 
  Prosser 
  has 
  succeeded 
  in 
  obtaining 
  an 
  

   extensive 
  series 
  of 
  plates 
  from 
  the 
  Catskill 
  which 
  show 
  the 
  char- 
  

   acteristic 
  ornamentation 
  described 
  by 
  Newberry. 
  The 
  plate 
  of 
  

   most 
  frequent 
  occurrence 
  is 
  the 
  antedorso-median, 
  but 
  it 
  is 
  

   seldom 
  found 
  entire. 
  Under 
  the 
  designation 
  of 
  " 
  scutes, 
  upper 
  

   and 
  lower 
  surfaces," 
  Newberry 
  figures 
  the 
  dorsal 
  aspect 
  of 
  this 
  

   element 
  in 
  plate 
  20, 
  fig. 
  6-8 
  of 
  his 
  monograph, 
  and 
  in 
  fig. 
  4 
  and 
  5 
  

   shows 
  the 
  same 
  plate 
  in 
  B. 
  leidyi, 
  all 
  more 
  or 
  less 
  imperfecta 
  

  

  