﻿AIE 
  MUSEUM 
  

  

  PLATE 
  8 
  

  

  . 
  t 
  h 
  e 
  s 
  (Vioa) 
  priscus 
  McCoy, 
  cast 
  of 
  

  

  y 
  6 
  in 
  a 
  shell 
  of 
  Pterinea 
  demissa 
  (Conrad) 
  

  

  oy 
  [after 
  McCoy, 
  Brit. 
  Paleoz. 
  Foss. 
  pi. 
  iB, 
  fig. 
  i, 
  ia] 
  

  

  ; 
  same. 
  A 
  series 
  of 
  clavate 
  tubes 
  in 
  the 
  shell 
  substance 
  

  

  of 
  Leptocoelia 
  flabellites 
  (Conrad) 
  all 
  starting 
  

  

  from 
  the 
  margin 
  of 
  the 
  valve 
  at 
  a 
  definite 
  period 
  of 
  growth 
  

  

  in 
  the 
  shell, 
  x 
  2. 
  Oriskany 
  sandstone, 
  Highland 
  Mills, 
  

  

  N. 
  Y. 
  

  

  3 
  The 
  same 
  in 
  a 
  valve 
  of 
  Spirifer 
  from 
  the 
  Chemung 
  group 
  

  

  near 
  Sideling 
  hill, 
  Maryland, 
  x 
  3 
  

  

  4 
  The 
  same. 
  A 
  valve 
  of 
  Aviculopecten 
  from 
  the 
  Chemung 
  

  

  group 
  (Upper 
  Devonic) 
  of 
  Allegany 
  county, 
  N. 
  Y. 
  with 
  a 
  

   series 
  of 
  borings 
  all 
  beginning 
  at 
  a 
  definite 
  growth 
  stage 
  

   of 
  the 
  shell 
  beyond 
  which 
  shell 
  growth 
  has 
  continued, 
  

   indicating 
  that 
  the 
  mollusk 
  was 
  alive 
  when 
  the 
  borings 
  

   were 
  begun 
  and 
  continued 
  to 
  live 
  while 
  they 
  were 
  making 
  

  

  5 
  A 
  valve 
  of 
  Spirifer 
  granulosus 
  from 
  the 
  Hamilton 
  

  

  shales 
  of 
  New 
  York, 
  with 
  several 
  such 
  borings 
  

  

  6 
  A 
  tube 
  cast 
  in 
  the 
  valve 
  of 
  the 
  brachiopod 
  Leptostro- 
  

  

  phia 
  perplana 
  (Conrad). 
  The 
  sponge 
  started 
  to 
  

   bore 
  at 
  the 
  thickened 
  cardinal 
  process 
  of 
  the 
  dorsal 
  valve 
  

   and 
  on 
  account 
  of 
  the 
  thinness 
  of 
  the 
  valve 
  was 
  com- 
  

   pelled 
  to 
  make 
  its 
  tube 
  broader 
  than 
  high. 
  At 
  the 
  inner 
  

   end 
  the 
  tube 
  spreads 
  out 
  and 
  shows 
  a 
  tendency 
  to 
  divide. 
  

   x 
  3 
  . 
  From 
  the 
  Hamilton 
  shales 
  of 
  New 
  York 
  

  

  7 
  Another 
  example 
  of 
  a 
  flattened 
  tube 
  cast 
  on 
  a 
  thin 
  shelled 
  

  

  pelecypod 
  of 
  the 
  Hamilton 
  group, 
  N. 
  Y. 
  

  

  8 
  Clavate 
  borings 
  in 
  a 
  valve 
  of 
  Leptostrophia 
  oris- 
  

  

  k 
  a 
  n 
  i 
  a 
  , 
  Oriskany 
  limestone, 
  Becraft 
  mountain, 
  N. 
  Y., 
  

   x 
  3 
  

  

  