﻿Report 
  of 
  the 
  State 
  Geologist. 
  367 
  

  

  of 
  the 
  New 
  York 
  State 
  Geologist,* 
  reference 
  was 
  made 
  to 
  a 
  sin- 
  

   istrally 
  coiled 
  gastropod, 
  under 
  the 
  generic 
  term 
  Sccevogyra. 
  The 
  

   name 
  was 
  introduced 
  by 
  Whitfield 
  in 
  1878,f 
  for 
  sinistral 
  shells 
  

   from 
  the 
  Lower 
  Magnesian 
  limestone 
  of 
  Wisconsin, 
  which 
  bear 
  

   resemblance 
  to 
  Maclurea, 
  but 
  the 
  spire 
  is, 
  in 
  the 
  typical 
  species, 
  

   considerably 
  elevated, 
  though 
  the 
  shell 
  is 
  deeply 
  umbilicated. 
  

   Mr. 
  Whitfield 
  regarded 
  these 
  fossils 
  as 
  probably 
  heteropodous. 
  

   Closer 
  examination 
  of 
  the 
  specimens 
  from 
  the 
  Marcellus 
  demon- 
  

   strates 
  that 
  they 
  are 
  of 
  quite 
  different 
  nature 
  than 
  Sccevogyra, 
  

   and 
  afford 
  an 
  interesting 
  instance 
  of 
  reversed- 
  coiling 
  in 
  the 
  pal- 
  

   aeozoic 
  pyramidellids. 
  

  

  The 
  shells 
  are 
  very 
  small, 
  and 
  are 
  not 
  associated 
  with 
  dextrally 
  

   coiled 
  species 
  of 
  similar 
  structure 
  in 
  any 
  other 
  respects. 
  Ml 
  the 
  

   whorls 
  are 
  sinistral, 
  are 
  regularly 
  rounded 
  on 
  their 
  upper 
  surface, 
  

   slightly 
  carinated 
  on 
  the 
  periphery 
  and 
  less 
  convex 
  below. 
  The 
  

   angle 
  of 
  the 
  apex 
  is 
  about 
  45°. 
  The 
  stoma 
  is 
  oval, 
  and 
  the 
  shell 
  

   non-umbilicated. 
  Surface 
  covered 
  with 
  low 
  and 
  very 
  faint 
  con- 
  

   centric 
  growth 
  lines. 
  

  

  DeKoninck 
  described 
  from 
  the 
  Carboniferous 
  limestone 
  of 
  

   Belgium, 
  certain 
  reversed 
  species 
  under 
  the 
  name 
  Agnesia, 
  and 
  

   these 
  have 
  been 
  regarded 
  by 
  Holzapfel 
  as 
  essentially 
  sinistrally 
  

   coiled 
  forms 
  of 
  JEuomphalus, 
  though 
  the 
  latter 
  author 
  has 
  found 
  

   the 
  group 
  not 
  homogeneous 
  and 
  has 
  separated 
  from 
  it 
  some 
  of 
  

   the 
  species 
  described 
  by 
  DeKonlnck, 
  proposing 
  for 
  them 
  the 
  

   name 
  Hesjperiella. 
  Hesperiella, 
  as 
  suggested 
  by 
  Dr. 
  Holzapfel, 
  

   is 
  a 
  genus 
  of 
  reversed 
  Pleurotomaridce. 
  

  

  The 
  form 
  under 
  consideration 
  is 
  a 
  holostomatous 
  shell, 
  in 
  effect 
  

   a 
  reversed 
  Macrochilina, 
  and 
  it 
  is 
  provisionally 
  referred 
  to 
  Lind- 
  

   strom's 
  genus 
  Onychochilus. 
  

  

  It 
  was 
  obtained 
  from 
  the 
  Stafford 
  limestone 
  of 
  the 
  Marcellus 
  

   division 
  at 
  Stafford, 
  Genesee 
  county 
  ; 
  a 
  rock 
  which 
  contains 
  a 
  rich 
  

   and 
  nearly 
  normal 
  Hamilton 
  fauna, 
  and 
  which 
  appears 
  in 
  the 
  

   Livonia 
  shaft 
  section 
  at 
  a 
  depth 
  of 
  823 
  feet. 
  

  

  Nuculites 
  subcuneatus, 
  sp. 
  nov. 
  

   Plate 
  IV, 
  figs. 
  9, 
  10. 
  

   Shells 
  oblique, 
  subtrihedral 
  in 
  contour, 
  transversely 
  oval 
  in 
  

   marginal 
  outline. 
  The 
  beaks 
  are 
  incurved, 
  directed 
  anteriorly 
  and 
  

  

  * 
  1889, 
  page 
  61. 
  

  

  t 
  Ann. 
  Rep't. 
  Geol. 
  Surv. 
  Wisconsin, 
  for 
  1877, 
  p. 
  61 
  ; 
  and 
  Geology 
  of 
  Wisconsin, 
  vol. 
  iv, 
  p. 
  196, 
  

   pi. 
  3, 
  figs. 
  7-11, 
  1882. 
  

  

  