﻿FOURTH 
  REPORT 
  OF 
  THE 
  DIRECTOR 
  IOX>7 
  1 
  69 
  

  

  Clionolithes 
  palmatus, 
  a 
  singular 
  form 
  assuming 
  

   broad 
  sparsely 
  branched 
  palmate 
  hollow 
  fronds 
  and 
  found 
  only 
  in 
  

   the 
  pekcypods 
  and 
  gastropods 
  of 
  the 
  Portage 
  group 
  (Upper 
  De- 
  

   vonic) 
  . 
  

  

  Among 
  these 
  boring 
  bodies 
  is 
  another, 
  which 
  judging 
  only 
  from 
  

   the 
  form 
  of 
  its 
  tubes 
  must 
  have 
  been 
  very 
  unlike 
  the 
  rest. 
  I 
  have 
  

   observed 
  it 
  only 
  in 
  the 
  brachiopods 
  of 
  the 
  Coblentzian 
  sandstone 
  

   and 
  in 
  order 
  to 
  express 
  its 
  notable 
  difference 
  from 
  the 
  other 
  borings 
  

   mentioned 
  shall 
  designate 
  it 
  as 
  Caulostrepsis 
  taeniola. 
  

   In 
  these 
  the 
  borers 
  began 
  at 
  the 
  edge 
  of 
  the 
  shell 
  and 
  the 
  casts 
  of 
  

   their 
  borings 
  are 
  long, 
  narrow 
  tapelike 
  tongues 
  with 
  an 
  elevated 
  

   edge 
  all 
  the 
  way 
  around. 
  This 
  corded 
  edge 
  is 
  a 
  continuous 
  tube 
  

   while 
  the 
  area 
  between 
  is 
  a 
  narrow 
  flat 
  space 
  connecting 
  the 
  tubes 
  

   of 
  the 
  loop. 
  I 
  hesitate 
  to 
  assign 
  this 
  curious 
  form 
  to 
  the 
  sponges; 
  

   it 
  has 
  in 
  miniature 
  a 
  resemblance 
  to 
  some 
  of 
  the 
  worm 
  casts 
  found 
  

   on 
  the 
  surface 
  of 
  old 
  rocks, 
  but 
  the 
  evident 
  open 
  connexion 
  between 
  

   the 
  tubes 
  of 
  the 
  loop 
  makes 
  it 
  difficult 
  to 
  allot 
  to 
  this 
  boring 
  its 
  

   probable 
  maker. 
  

  

  Boring 
  pelecypods 
  were 
  not 
  unknown 
  in 
  the 
  early 
  Paleozoic. 
  

   Instances 
  are 
  rare 
  indeed 
  but 
  a 
  very 
  striking 
  example 
  is 
  the 
  small 
  

   Modiomorphalike 
  shell 
  Corallidomus 
  concentricus 
  

   described 
  by 
  Whitfield 
  from 
  the 
  Cincinnati 
  shales 
  of 
  Ohio 
  [see 
  Geol. 
  

   Ohio. 
  1893. 
  7 
  : 
  493, 
  pi. 
  13]. 
  The 
  figure 
  given 
  by 
  this 
  author 
  shows 
  a 
  

   colony 
  of 
  the 
  coral 
  Labechia 
  ohioensis 
  Nicholson 
  per- 
  

   forated 
  by 
  scores 
  of 
  burrows 
  in 
  some 
  of 
  which 
  the 
  shell 
  itself 
  is 
  

   found. 
  Such 
  occuirences 
  have 
  been 
  freely 
  described 
  in 
  Mesozoic 
  

   faunas 
  and 
  boring 
  insects 
  in 
  the 
  woods 
  of 
  the 
  Tertiary. 
  

  

  