﻿DR. 
  ball: 
  OLIGOCENE 
  of 
  TAMPA, 
  ETC. 
  39 
  

  

  Mississippi, 
  wliich 
  is 
  Lower 
  Oligocene. 
  The 
  American 
  form 
  is 
  hardly 
  

   varietally 
  distinct 
  from 
  the 
  European 
  and 
  was 
  named 
  Ampul/ 
  itwps 
  is 
  

   by 
  Conrad 
  twenty 
  years 
  before 
  Fischer 
  separated 
  it. 
  Tlie 
  " 
  genus" 
  is 
  

   in 
  my 
  opinion 
  but 
  sectionally 
  distinct 
  from 
  Ampullina, 
  Eowdioh 
  

   (1822), 
  of 
  which 
  there 
  are 
  in 
  the 
  Tampa 
  fauna 
  three 
  species. 
  No 
  

   species 
  of 
  this 
  group 
  occur 
  in 
  either 
  division 
  of 
  our 
  Amei'ican 
  

   Miocene, 
  which 
  accords 
  with 
  M. 
  Cossmann's 
  view 
  as 
  to 
  the 
  European 
  

   Miocene. 
  

  

  M. 
  Cossmann 
  complains 
  that 
  the 
  two 
  species 
  of 
  Tampa 
  Orthaulax 
  

   figured 
  are 
  represented 
  by 
  imperfect 
  specimens, 
  but 
  since 
  no 
  complete 
  

   specimen 
  has 
  ever 
  been 
  known 
  this 
  could 
  not 
  well 
  be 
  helped. 
  

  

  M. 
  Cossmann 
  states 
  that 
  I 
  base 
  my 
  attribution 
  of 
  the 
  Tampa 
  horizon 
  

   to 
  the 
  Oligocene 
  on 
  the 
  presence 
  in 
  it 
  of 
  Orbitolites 
  floridanus, 
  Conrad. 
  

   Since 
  I 
  have 
  never 
  held 
  nor 
  expressed 
  such 
  an 
  opinion 
  I 
  am 
  at 
  a 
  loss 
  

   to 
  understand 
  upon 
  what 
  he 
  bases 
  this 
  absolutely 
  incorrect 
  assertion, 
  

   especially 
  as 
  I 
  liave 
  in 
  numerous 
  publications 
  given 
  other 
  grounds 
  for 
  

   ray 
  opinion. 
  

  

  It 
  is 
  regrettable, 
  in 
  view 
  of 
  the 
  many 
  useful 
  and 
  extensive 
  works 
  on 
  

   palaeontology 
  published 
  by 
  M. 
  Cossmann, 
  that 
  he 
  adheres 
  to 
  an 
  obsolete 
  

   nomenclature 
  and 
  persists 
  in 
  def}'ing 
  the 
  International 
  rules. 
  His 
  

   completely 
  erroneous 
  view 
  of 
  Bolten's 
  work 
  will 
  be 
  appi'eciated 
  by 
  

   those 
  who 
  have 
  read 
  the 
  introductory 
  pages 
  of 
  my 
  recently 
  published 
  

   Index 
  to 
  the 
  Museum 
  Boltenianum. 
  

  

  I 
  am 
  glad 
  to 
  be 
  able 
  to 
  announce 
  that 
  the 
  sparsely 
  fossiliferous 
  

   limestone 
  forming 
  the 
  basis 
  of 
  the 
  Floridian 
  peninsula 
  has 
  recently 
  

   been 
  determined 
  by 
  Dr. 
  C. 
  Wythe 
  Cooke, 
  of 
  the 
  U.S. 
  Geological 
  

   Survey, 
  to 
  belong 
  to 
  Upper 
  Eocene 
  (Jacksonian). 
  This 
  rock 
  was 
  

   throughout 
  tlie 
  earlier 
  literature 
  correlated 
  with 
  the 
  Lower 
  Oligocene 
  

   (Vicksburgian), 
  and 
  I 
  have 
  been 
  much 
  criticized 
  for 
  maintaining 
  their 
  

   distinctness 
  since 
  1892,' 
  when 
  I 
  separated 
  it, 
  together 
  with 
  its 
  

   culminating 
  phase 
  the 
  Ocala 
  Limestone, 
  under 
  the 
  name 
  of 
  the 
  

   Peninsula 
  Limestone. 
  Tlie 
  palaeontologic 
  evidence 
  was 
  at 
  that 
  time 
  

   insufficient 
  to 
  determine 
  its 
  exact 
  position, 
  and 
  it 
  is 
  satisfactory 
  

   to 
  have 
  the 
  matter 
  settled. 
  

  

  ' 
  Bull. 
  U.S. 
  Geol. 
  Surv., 
  No. 
  84, 
  1892. 
  

  

  