PLATE 1. 



Cyathophyllum halli (Edwards and Haime) 

 Page 49. 



Fig. 1. A much-weathered specimen. About two-thirds natural size. 

 (Callaway limestone of Boone County.) 



Chonophyllum ellipticum Hall and Whit field 

 Page 51. 



Fig. 2. A large specimen from the Snyder Creek shale. 



Figs. 3 and 5. Other specimens from the Snyder Creek about % natural size. 



Fig. 4. An average specimen from the Callaway limestone. (X 4/5.) 



Streptelasma cooperensis Branson 

 Page 48. 



Figs. 6 and 7. Specimens from the Cooper limestone near Lupus. About ^4 natural 

 size. 



