﻿96 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  to 
  the 
  Hudson 
  river. 
  These 
  were, 
  however, 
  in 
  every 
  case 
  insignifi- 
  

   cant 
  in 
  thickness 
  and 
  less 
  characteristic 
  in 
  development 
  than 
  those 
  

   of 
  the 
  Normanskill 
  formation, 
  the 
  thickest 
  sandstone 
  bed 
  measur- 
  

   ing 
  but 
  3 
  feet. 
  

  

  The 
  Snake 
  hill 
  locality 
  has 
  furnished 
  the 
  following 
  fauna: 
  

  

  Graptolites 
  

  

  Dicranograptus 
  nicholsoni 
  Hopkinson 
  

  

  Diplograptus 
  (Mesogr.) 
  putillus 
  Hall 
  

  

  Corynoides 
  sp. 
  

   Crinoidea 
  

  

  Glyptocrinus 
  sp. 
  

  

  Heterocrinus 
  ? 
  gracilis 
  H 
  all 
  

  

  Cremacrinus 
  sp. 
  

  

  Carabocrinus 
  cf. 
  radiatus 
  Billings 
  

   Cystoidea 
  

  

  Edrioaster 
  saratogensis 
  Rued. 
  

   Bryozoa 
  

  

  Paleschara 
  ulrichi 
  Rued. 
  

  

  * 
  

  

  Brachiopoda 
  

  

  Schizomania 
  filosa 
  (Hall) 
  

  

  Plectambonites 
  sericeus 
  typus 
  (Sowerby) 
  

  

  Plectorthis 
  cf. 
  whitfieldi 
  (Winchell) 
  

  

  Dalmanella 
  testudinaria 
  (Dolman) 
  

  

  Plaesiomys 
  retrorsa 
  auct. 
  

  

  Rafinesquina 
  alternata 
  (Emmons) 
  

  

  Clitambonites 
  americanus 
  (Whitfield) 
  

  

  Parastrophia 
  hemiplicata 
  Hall 
  

  

  Zygospira 
  recurvirostris 
  (Hall) 
  

   Pelecypoda 
  

  

  Whiteavesia 
  cincta 
  Rued. 
  

  

  W. 
  cumingsi 
  Rued. 
  

  

  Orthodesma? 
  subcarinatum 
  Rued. 
  

  

  Whitella 
  elongata 
  Rued. 
  

  

  Clidophorus 
  ventricosus 
  Rued. 
  

  

  C. 
  foerstei 
  Rued. 
  

  

  Ctenodonta 
  levata 
  (Hall) 
  

  

  C. 
  declivis 
  Rued. 
  

  

  C. 
  prosseri 
  Rued. 
  

  

  C. 
  radiata 
  Rued. 
  

  

  C. 
  recta 
  Rued. 
  

  

  C. 
  subcuneata 
  Rued. 
  

  

  

  

  