﻿294 
  B. 
  Wade 
  — 
  Upper 
  Cretaceous 
  Fulgur. 
  

  

  older 
  than 
  the 
  Oligocene. 
  Dall,* 
  however, 
  points 
  out 
  that 
  the 
  

   genus 
  had 
  assumed 
  its 
  essential 
  shell 
  features 
  before 
  the 
  close 
  

   of 
  the 
  Eocene 
  and 
  that 
  the 
  group 
  took 
  its 
  rise 
  within 
  the 
  

   Eocene. 
  The 
  fulguroids 
  are 
  abundant 
  in 
  the 
  Eocene 
  and 
  are 
  

   represented 
  by 
  a 
  number 
  of 
  forms 
  whose 
  generic 
  relationships 
  

   have 
  not 
  been 
  well-established 
  and 
  have 
  been 
  variously 
  assigned. 
  

   The 
  more 
  important 
  of 
  these 
  are 
  u 
  Busycon 
  spiniger" 
  Conrad, 
  

   Fulgur 
  triserialis 
  Whitfield, 
  Fulgur 
  f 
  dallianum 
  Harris, 
  

   Levifusus 
  dalei 
  Harris, 
  Levifusus 
  Blakei 
  Conrad, 
  Levifusus 
  

   trabeatus 
  Conrad, 
  Bulbifusus 
  inornatus 
  Conrad, 
  etc. 
  Which 
  

   of 
  these 
  are 
  true 
  Busycons 
  has 
  not 
  been 
  established. 
  The 
  

   Eocene 
  Falgurs 
  have 
  small, 
  thin 
  shells 
  and 
  less 
  bulbous 
  pro- 
  

   toconchs 
  in 
  contrast 
  with 
  the 
  ponderous 
  conchs 
  which 
  con- 
  

   stitute 
  one 
  of 
  the 
  most 
  conspicuous 
  elements 
  of 
  the 
  later 
  Ter- 
  

   tiary. 
  This 
  has 
  led 
  to 
  the 
  conclusion 
  that 
  the 
  Eocene 
  species 
  

   were 
  the 
  most 
  primitive 
  forms 
  and 
  that 
  the 
  genus 
  evolved 
  in 
  

   that 
  period. 
  However, 
  the 
  recent 
  discovery, 
  in 
  the 
  Upper 
  

   Cretaceous 
  of 
  McNairy 
  County, 
  Tennessee, 
  of 
  a 
  typical 
  Busy- 
  

   con 
  or 
  Fulgur 
  would 
  seem 
  to 
  show 
  that 
  the 
  genus 
  was 
  well- 
  

   differentiated 
  long 
  before 
  Eocene 
  time. 
  Further 
  collecting 
  and 
  

   study 
  of 
  well-preserved 
  Cretaceous 
  and 
  Eocene 
  material 
  may 
  

   throw 
  much 
  light 
  on 
  the 
  relations 
  of 
  this 
  most 
  interesting 
  

   family 
  of 
  North 
  American 
  late 
  Mesozoic 
  and 
  Tertiary 
  gas- 
  

   tropods. 
  

  

  There 
  appear 
  to 
  be 
  two 
  species 
  of 
  Busycon 
  in 
  the 
  Upper 
  

   Cretaceous 
  of 
  Tennessee, 
  the 
  larger 
  and 
  more 
  perfect 
  of 
  which 
  

   forms 
  the 
  basis 
  of 
  the 
  present 
  note. 
  For 
  the 
  sake 
  of 
  complete- 
  

   ness 
  the 
  generic 
  synonymy 
  is 
  given 
  followed 
  by 
  a 
  description 
  of 
  

   the 
  new 
  form. 
  

  

  Family 
  Busyconid^: 
  

  

  Genus 
  Busycon 
  Bolten. 
  

  

  Busycon 
  Bolten, 
  Mus. 
  Boltenianum, 
  p. 
  149, 
  1798, 
  First 
  species. 
  

  

  Fulgur 
  carica 
  Montfort. 
  

   Ftdgur 
  Montfort, 
  Conch., 
  vol. 
  ii, 
  p. 
  503, 
  and 
  figure, 
  1810. 
  Type, 
  

  

  F. 
  carica 
  var. 
  eleceans 
  Montfort. 
  

   Sycopsis 
  Conrad, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  iii, 
  p. 
  184, 
  1867. 
  

   Sycopsis 
  (Browne) 
  Gill, 
  ibid., 
  vol. 
  iii, 
  p. 
  147, 
  1867. 
  

   Fulgur 
  Fischer, 
  Manuel 
  de 
  Conchyliologie, 
  Paris, 
  p. 
  620, 
  1887. 
  

   Fulgur 
  Dall, 
  Trans. 
  Wagner 
  Free 
  Inst. 
  Sci., 
  Philadelphia, 
  vol. 
  iii, 
  

  

  pt. 
  1, 
  pp. 
  109-118, 
  1890. 
  

   Fulgur 
  Cossmann, 
  M., 
  Essais 
  de 
  Paleoconchologie 
  Comparee, 
  

  

  Paris, 
  pp. 
  76-77, 
  1901. 
  

   Fulgur 
  and 
  Sycotyjms 
  Grabau 
  and 
  Shinier, 
  Index 
  Fossils 
  of 
  North 
  

  

  America, 
  vol. 
  i, 
  pp. 
  767-770, 
  1903. 
  

   Busycon 
  Dall, 
  Fauna 
  of 
  the 
  Orthaulax 
  pugnax 
  zone, 
  Bull. 
  90, 
  

  

  U. 
  S. 
  Nat. 
  Mus., 
  p. 
  66, 
  1915. 
  

  

  *Dall, 
  W. 
  H., 
  Trans. 
  Wagner 
  Free 
  Inst. 
  Sci., 
  Philadelphia, 
  vol. 
  iii, 
  pt. 
  1, 
  

   p. 
  109, 
  1890. 
  

  

  