﻿172 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  PLATE 
  1 
  

  

  i 
  Part 
  of 
  the 
  weathered 
  surface 
  of 
  a 
  Stromatopora 
  from 
  the 
  

   Cobleskill 
  limestone, 
  Schoharie, 
  N. 
  Y., 
  showing 
  the 
  open- 
  

   ings 
  of 
  the 
  worm 
  tubes 
  Gitonia 
  sipho 
  

  

  2 
  A 
  section 
  of 
  the 
  same 
  colony 
  permeated 
  with 
  such 
  tubes 
  

  

  3 
  A 
  colony 
  of 
  Favosites 
  spheric 
  us 
  Hall 
  from 
  the 
  

  

  New 
  Scotland 
  beds 
  (Helderbergian) 
  with 
  similar 
  tubes 
  

  

  4 
  A 
  head 
  of 
  the 
  trilobite 
  Dalmanites 
  overgrown 
  with 
  a 
  colony 
  

  

  of 
  Monticulipora 
  in 
  which 
  is 
  embedded 
  a 
  series 
  of 
  

   Gitonia 
  sipho. 
  Onondaga 
  limestone, 
  Becraft 
  moun- 
  

   tain, 
  N. 
  Y. 
  

  

  5 
  Sections 
  of 
  spiral 
  tubes 
  (Streptindytes 
  concoe- 
  

  

  natus) 
  in 
  a 
  colony 
  of 
  Stromatopora. 
  The 
  apparent 
  

   difference 
  in 
  direction 
  of 
  volution 
  in 
  these 
  is 
  due 
  entirely 
  

   to 
  the 
  different 
  depth 
  and 
  angle 
  at 
  which 
  the 
  tubes 
  are 
  cut. 
  

   From 
  the 
  Cobleskill 
  limestone 
  (Upper 
  Siluric) 
  Schoharie. 
  

   x 
  2 
  

  

  6 
  An 
  enlarged 
  restoration 
  of 
  the 
  characters 
  of 
  these 
  worm 
  

  

  tubes, 
  x 
  5 
  

  

  7 
  Streptindytes 
  acervulariae 
  Calvin 
  : 
  tw 
  D 
  tubes 
  

  

  in 
  a 
  colony 
  of 
  Acervularia 
  davidsoni 
  E. 
  and 
  

   H. 
  x 
  1.5. 
  From 
  the 
  Middle 
  Devonic 
  of 
  Roberts 
  Ferry, 
  

   Iowa 
  

  

  