﻿B. 
  Wade 
  — 
  Upper 
  Cretaceous 
  Fulgur. 
  297 
  

  

  of 
  the 
  body 
  does 
  not 
  appear 
  on 
  any 
  of 
  the 
  later 
  Tertiary 
  and 
  

   Recent 
  representatives 
  of 
  the 
  genus 
  and 
  may 
  possibly 
  be 
  ex- 
  

   plained 
  as 
  an 
  inherited 
  character 
  from 
  a 
  more 
  primitive 
  type 
  

   with 
  an 
  abruptly 
  constricted 
  body 
  whorl 
  such 
  as 
  that 
  of 
  

   Pyropsis 
  and 
  Tudicla. 
  Much 
  more 
  probably, 
  however, 
  the 
  

   basal 
  sulcus 
  and 
  marginal 
  notch 
  are 
  in 
  some 
  way 
  analogous 
  to 
  

   the 
  more 
  or 
  less 
  well-defined 
  band 
  and 
  marginal 
  notch 
  used 
  by 
  

   many 
  of 
  the 
  recent 
  groups, 
  notably 
  in 
  Strombus, 
  for 
  the 
  ex- 
  

   trusion 
  of 
  the 
  eye-stalks. 
  Although 
  the 
  sulcus 
  is 
  peculiar 
  to 
  

   Protobusycon, 
  the 
  abrupt 
  basal 
  constriction 
  is 
  shared 
  by 
  some 
  

   of 
  the 
  Eocene 
  members 
  of 
  the 
  group, 
  and 
  by 
  Busycon 
  

   stellatum* 
  Dall 
  of 
  the 
  Florida 
  Oligocene. 
  

  

  Occurrence. 
  — 
  Ripley 
  Formation 
  : 
  Dave 
  Weeks 
  Place, 
  on 
  

   Coon 
  Creek, 
  McNairy 
  County, 
  Tennessee. 
  (Collected 
  by 
  the 
  

   writer.) 
  

  

  Geological 
  Laboratory, 
  

  

  The 
  Johns 
  Hopkins 
  University. 
  

  

  *Dall, 
  W. 
  H., 
  Molluscan 
  Fauna 
  of 
  the 
  Orthaulax 
  Pugnax 
  zone, 
  U. 
  S. 
  Nat. 
  

   Mus. 
  Bull. 
  90, 
  p. 
  67, 
  pi. 
  10, 
  figs. 
  7, 
  9, 
  1915. 
  

  

  