﻿Hyaiostelia 
  (?) 
  Marcellia, 
  sp. 
  nov. 
  

  

  Fig. 
  19. 
  — 
  An 
  enlargement 
  of 
  a 
  portion 
  of 
  rock 
  surface, 
  showing 
  the 
  

   cruciform, 
  rod-shaped 
  and 
  strand-like 
  spicules 
  . 
  X 
  5 
  . 
  

  

  Fig. 
  20. 
  — 
  A 
  larger 
  surface 
  less 
  enlarged 
  . 
  X 
  2 
  . 
  

  

  Fig. 
  21. 
  — 
  A 
  spicule 
  viewed 
  from 
  the 
  interior 
  surface 
  and 
  showing 
  

   the 
  broken 
  end 
  of 
  the 
  axial 
  ray. 
  X 
  16. 
  

  

  Fig. 
  22. 
  — 
  A 
  still 
  further 
  enlargement 
  of 
  a 
  spicule, 
  showing 
  the 
  outer 
  

   surface 
  and 
  the 
  node 
  to 
  which 
  one 
  branch 
  of 
  the 
  axial 
  ray 
  is 
  reduced. 
  

  

  Marcellus 
  shales, 
  from 
  812 
  to 
  823 
  feet 
  in 
  the 
  Livonia 
  shaft 
  

  

  3S3 
  

  

  