﻿366 
  Forty-seventh 
  Report 
  on 
  tee 
  State 
  Museum. 
  

  

  The 
  species 
  is 
  less 
  robust 
  and 
  more 
  graceful 
  than 
  G. 
  Fischeri, 
  

   Hall, 
  of 
  the 
  Goniatite 
  limestone, 
  differing 
  in 
  its 
  marginal 
  curva- 
  

   ture 
  and 
  general 
  proportions 
  from 
  this 
  as 
  well 
  as 
  other 
  described 
  

   members 
  of 
  the 
  genus. 
  

  

  From 
  the 
  calcareous 
  beds 
  of 
  the 
  Marcellus 
  shales 
  at 
  Chapin- 
  

   ville, 
  Ontario 
  county, 
  N. 
  Y. 
  

  

  Hyolithus 
  ceratophilus, 
  sp. 
  nov. 
  

   Plate 
  IV, 
  figs. 
  17, 
  18. 
  

  

  The 
  genus 
  Hyolithus 
  was 
  one 
  of 
  great 
  rarity 
  in 
  limestone 
  

   faunas 
  of 
  the 
  Upper 
  Helderberg 
  group. 
  Indeed, 
  as 
  we 
  know 
  of 
  

   the 
  occurrence 
  of 
  but 
  a 
  single 
  form 
  of 
  these 
  limestones, 
  the 
  dis- 
  

   covery 
  of 
  a 
  species 
  of 
  quite 
  commanding 
  proportions 
  in 
  this 
  fauna 
  

   is 
  worthy 
  of 
  record. 
  A 
  specimen 
  was 
  sent 
  to 
  the 
  museum 
  in 
  

   January, 
  1892, 
  by 
  Dr. 
  D. 
  F. 
  Lincoln, 
  of 
  Geneva, 
  E". 
  Y., 
  which 
  

   was 
  taken 
  from 
  the 
  lower 
  part 
  of 
  the 
  Corniferous 
  limestone 
  in 
  

   the 
  northern 
  part 
  of 
  that 
  township. 
  

  

  The 
  apical 
  portion 
  of 
  the 
  shell 
  is 
  wanting, 
  but, 
  where 
  entire, 
  

   the 
  original 
  length 
  was 
  not 
  less 
  than 
  70 
  mm., 
  while 
  the 
  trans- 
  

   verse 
  diam* 
  ter 
  at 
  the 
  aperture 
  is 
  20 
  mm. 
  The 
  ventral 
  or 
  flat 
  side 
  

   of 
  the 
  shell 
  is 
  produced 
  at 
  the 
  aperture, 
  wherfe 
  its 
  outline 
  is 
  

   broadly 
  convex, 
  and 
  the 
  dorsal 
  side 
  is 
  subangular 
  medially 
  with 
  

   sloping 
  flattened 
  sides. 
  The 
  ornamentation 
  con-ists 
  of 
  longitu- 
  

   dinal 
  lines, 
  strongly 
  elevated 
  on 
  the 
  dorsal 
  side, 
  where 
  the. 
  alter- 
  

   nation 
  in 
  size 
  is 
  very 
  apparent. 
  On 
  the 
  opposite 
  side 
  the 
  longi- 
  

   tudinal 
  lines 
  are 
  fainter, 
  and 
  are 
  crossed 
  by 
  concentric 
  growth 
  

   lines 
  which 
  are 
  not 
  distinct 
  outwardly. 
  

  

  Hyolithus 
  ligea, 
  flail, 
  which 
  occurs 
  not 
  infrequently 
  in 
  the 
  

   Schoharie 
  t^rit, 
  and 
  has 
  been 
  reported 
  in 
  a 
  single 
  instance 
  from 
  

   the 
  limestone 
  at 
  Clarence, 
  N. 
  Y., 
  is 
  a 
  much 
  s 
  nailer 
  shell 
  with 
  

   distinct 
  contour 
  and 
  surface 
  markings, 
  and 
  a 
  similar 
  difference 
  is 
  

   apparent 
  between 
  H. 
  ceratophilus 
  and 
  II. 
  principalis, 
  Hall, 
  of 
  the 
  

   Schoharie 
  grit, 
  the 
  latter 
  a 
  species 
  of 
  still 
  larger 
  proportions 
  than 
  

   the 
  former. 
  

  

  Onychochilus 
  nitidulus, 
  sp. 
  nov. 
  

   Plate 
  IV, 
  figs. 
  13-16. 
  

  

  In 
  a 
  list 
  of 
  the 
  fossils 
  known 
  to 
  occur 
  in 
  the 
  Marcellus 
  division 
  

   of 
  the 
  Hamilton 
  series, 
  published 
  in 
  the 
  Eighth 
  Annual 
  Eeport 
  

  

  