﻿Report 
  of 
  the 
  State 
  Geologist, 
  363 
  

  

  distinguish, 
  it 
  from 
  other 
  described 
  forms. 
  The 
  surface 
  bears 
  

   two 
  series 
  of 
  sharply 
  elevated 
  striae 
  of 
  about 
  equal 
  size, 
  though 
  

   the}' 
  vary 
  somewhat 
  among 
  themselves. 
  The 
  concentric 
  striae 
  

   are 
  low, 
  broad 
  at 
  the 
  base, 
  leaving 
  rather 
  narrow 
  interspaces, 
  

   while 
  the 
  vertical 
  striae 
  are 
  much 
  more 
  sharply 
  elevated 
  and 
  

   broader, 
  the 
  interspaces 
  being 
  larger 
  than 
  between 
  the 
  members 
  

   of 
  the 
  other 
  series. 
  The 
  transverse 
  striae 
  are 
  of 
  subequal 
  size, 
  

   there 
  being 
  slightly 
  coarser 
  ones 
  at 
  irregular 
  intervals 
  while 
  the 
  

   crossing 
  striae 
  alterna 
  e 
  regularly 
  in 
  size, 
  forming 
  in 
  general 
  two 
  

   series. 
  The 
  course 
  of 
  the 
  transverse 
  striae 
  is 
  not 
  modified 
  by 
  the 
  

   vertical 
  striae, 
  while 
  the 
  latter 
  are 
  warped 
  over 
  the 
  former 
  and 
  

   down 
  i 
  ito 
  the 
  interspaces, 
  forming 
  low 
  nodes 
  at 
  the 
  points 
  of 
  

   intersection. 
  On 
  the 
  internal 
  cast 
  traces 
  of 
  the 
  transverse 
  striae 
  

   are 
  more 
  clearly 
  retained 
  and 
  they 
  leave 
  rather 
  broad 
  depres- 
  

   sions 
  on 
  the 
  surface 
  giving 
  the 
  cast 
  an 
  appearance 
  suggesting 
  the 
  

   surface 
  in 
  the 
  species 
  0. 
  aulax 
  ar.d 
  0. 
  anguis, 
  Hall, 
  O.filosum, 
  

   Ciarke, 
  and 
  the 
  supposed 
  pteropod 
  shell 
  Pharetrdla 
  tenebrosa, 
  

   Hall, 
  three 
  species 
  which 
  may 
  prove 
  to 
  be 
  congeneric 
  organisms. 
  

   The 
  orginal 
  specimen 
  is 
  from 
  the 
  Stafford 
  limestone, 
  at 
  Stafford, 
  

   Genesee 
  county, 
  K 
  Y. 
  

  

  Orthoceras 
  Staffordensis, 
  sp. 
  nov. 
  

  

  Plate 
  II, 
  figs. 
  1, 
  2. 
  

  

  This 
  is 
  another 
  of 
  the 
  annulated 
  orthocerata 
  in 
  which 
  the 
  con- 
  

   centric 
  rings 
  are 
  low, 
  fine, 
  irregularly 
  distant 
  and 
  crossed 
  by 
  

   fine 
  though 
  sharply 
  elevated, 
  equidistant 
  longitudinal 
  striae 
  of 
  

   two 
  series. 
  These 
  and 
  the 
  interspaces 
  are 
  crossed 
  by 
  finer 
  and 
  

   very 
  sharp 
  imbricating 
  concentric 
  striae 
  which 
  at 
  their 
  intersec- 
  

   tion 
  with 
  the 
  former 
  make 
  low 
  nodes, 
  retrally 
  inclined. 
  

  

  The 
  original 
  specimen, 
  from 
  the 
  Stafford 
  limestone 
  of 
  the 
  

   Marcellus 
  shales, 
  at 
  Stafford, 
  Genesee 
  county, 
  has 
  a 
  length 
  of 
  

   68 
  mm., 
  a 
  greatest 
  diameter 
  of 
  16 
  mm. 
  and 
  bears 
  44 
  annulations. 
  

   This 
  species 
  differs 
  from 
  0. 
  nuntium 
  in 
  the 
  more 
  numerous 
  and 
  

   less 
  regular 
  annulations; 
  from 
  0. 
  Idmon 
  in 
  the 
  same 
  manner 
  

   and 
  its 
  more 
  regular, 
  rather 
  coarser 
  longitudinal 
  striae 
  and 
  sharp 
  

   concentric 
  lines 
  ; 
  from 
  0. 
  celamm 
  and 
  0. 
  Lima 
  in 
  the 
  character 
  

   of 
  the 
  surface 
  sculpture. 
  

  

  