﻿Publications 
  of 
  Fl. 
  Ameghino. 
  265 
  

  

  All 
  the 
  molluscs 
  which 
  he 
  quotes 
  from 
  the 
  Piso 
  Rionegrense 
  

   are 
  found 
  in 
  the 
  marine 
  deposits 
  of 
  Chubnt, 
  which 
  follow 
  the 
  

   coast 
  up 
  to 
  the 
  mouth 
  of 
  the 
  Rio 
  Negro, 
  and 
  which 
  are 
  much 
  

   older 
  than 
  the 
  Rio 
  Negro 
  sandstones. 
  

  

  This 
  sandstone 
  deposit 
  has 
  a 
  very 
  wide 
  distribution 
  in 
  Pata- 
  

   gonia, 
  and 
  extends 
  as 
  far 
  west 
  as 
  the 
  Cordilleras. 
  I 
  have 
  found 
  

   it 
  in 
  all 
  cases 
  immediately 
  below 
  the 
  glacial 
  bowlder 
  formation, 
  

   and 
  it 
  belongs 
  no 
  doubt 
  in 
  the 
  uppermost 
  Tertiary, 
  and 
  corre- 
  

   sponds 
  possibly 
  with 
  the 
  Cape 
  Fairweather 
  beds 
  of 
  Hatcher. 
  

  

  5. 
  The 
  same 
  seems 
  to 
  be 
  true 
  of 
  the 
  Piso 
  Tehuelchense, 
  

   which 
  Ameghino 
  puts 
  also 
  in 
  the 
  Lower 
  Miocene. 
  The 
  marine 
  

   deposits, 
  however, 
  which 
  he 
  refers 
  to 
  as 
  belonging 
  here, 
  seem 
  

   to 
  be 
  older. 
  

  

  Ameghino 
  apparently 
  has 
  not 
  the 
  slightest 
  idea 
  of 
  the 
  strati- 
  

   graphy 
  of 
  Patagonia, 
  otherwise 
  such 
  confusion 
  would 
  have 
  

   been 
  impossible, 
  and 
  he 
  would 
  not 
  have 
  published 
  the 
  errone- 
  

   ous 
  view 
  that 
  the 
  Tehuelche 
  formation, 
  in 
  which 
  he 
  includes 
  

   the 
  Patagonian 
  bowlder 
  formation, 
  which 
  is 
  clearly 
  Quaternary, 
  

   belongs 
  in 
  the 
  Lower 
  Miocene 
  ! 
  

  

  I 
  cannot 
  enter 
  upon 
  a 
  detailed 
  discussion 
  of 
  the 
  palaeonto- 
  

   logical 
  part 
  of 
  his 
  Sinopsis 
  : 
  the 
  same 
  confusion 
  prevails 
  here 
  as 
  

   in 
  the 
  geological 
  part. 
  He 
  retains 
  all 
  the 
  genera 
  and 
  species 
  

   created 
  by 
  himself, 
  many 
  of 
  which 
  cannot 
  stand 
  in 
  the 
  face 
  of 
  

   a 
  candid 
  criticism 
  ; 
  on 
  the 
  other 
  hand, 
  he 
  declares 
  many 
  of 
  

   those 
  genera 
  created 
  by 
  others 
  to 
  be 
  synonyms 
  of 
  his 
  own. 
  

   For 
  instance, 
  without 
  giving 
  any 
  proof 
  he 
  makes 
  all 
  the 
  new 
  

   species 
  determined 
  by 
  me 
  from 
  the 
  Tertiary 
  deposits 
  on 
  the 
  

   Collon 
  Cura* 
  synonyms 
  of 
  species 
  described 
  by 
  himself 
  from 
  

   the 
  Santa-Cruz 
  beds, 
  and 
  he 
  does 
  the 
  same 
  thing 
  with 
  my 
  

   Mesozoic 
  mammals,f 
  declaring 
  all 
  genera 
  without 
  exception 
  

   to 
  be 
  identical 
  with 
  genera, 
  of 
  his 
  Pyrotherium 
  fauna. 
  Mr. 
  

   Hatcher, 
  who 
  looked 
  over 
  some 
  of 
  the 
  types 
  of 
  this 
  latter 
  

   fauna 
  with 
  Ameghino, 
  when 
  he 
  was 
  shown 
  the 
  Mesozoic 
  mam- 
  

   malian 
  remains 
  of 
  our 
  collection, 
  remarked 
  that 
  he 
  had 
  seen 
  

   nothing 
  like 
  this 
  fauna 
  either 
  in 
  Ameghino's 
  collection 
  or 
  dur- 
  

   ing 
  his 
  travels 
  in 
  Patagonia, 
  and 
  that 
  nothing 
  of 
  the 
  kind 
  was 
  

   known 
  to 
  him 
  from 
  North 
  America. 
  Since 
  Ameghino 
  does 
  

   not 
  mention 
  any 
  facts 
  supporting 
  his 
  allegations, 
  there 
  is 
  no 
  

   reason 
  why 
  I 
  should 
  cancel 
  a 
  single 
  one 
  of 
  my 
  genera, 
  or 
  why 
  

   I 
  should 
  characterize 
  them 
  again. 
  But 
  in 
  order 
  to 
  show 
  how 
  

   arbitrarily 
  he 
  acts, 
  I 
  reproduce 
  here 
  the 
  figures 
  of 
  two 
  species 
  

   of 
  Mesozoic 
  mammals 
  described 
  by 
  myself, 
  and 
  the 
  figures 
  of 
  

   his 
  species 
  with 
  which 
  he 
  says 
  they 
  are 
  identical. 
  I 
  may 
  men- 
  

   tion 
  also, 
  that 
  in 
  several 
  cases 
  he 
  declares 
  a 
  genus 
  of 
  which 
  I 
  

   possess 
  only 
  the 
  upper 
  jaw, 
  to 
  be 
  identical 
  with 
  a 
  genus 
  of 
  

   which 
  he 
  has 
  only 
  the 
  lower, 
  or 
  vice 
  versa. 
  

  

  *Apuntes, 
  etc.. 
  1898. 
  

  

  \ 
  Aviso 
  prelimiaar 
  sobre 
  mamiferos 
  mesozoicos, 
  Rev. 
  Mus. 
  La 
  Plata, 
  1898. 
  

  

  