PLATE XXII 



PAGE 



Fig. 1. FAVOSITES HELDERBERGI^E Hall 208 



Corallum showing hemispherical form. New Scotland formation, 

 New York. 



Figs. 2-7. FAVOSITES HELDERBERGI.E VAR. PR^CEDENS Schuchert 209 



2. Corallum of lobate form. Keyser, W. Va. 



3. Corallum of clavate form. Near Seymour, W. Va. 



4. Corallum of dendroid form. Keyser, W. Va. 



5, 6. Tangential and radial sections. X 2%. Lower Stromatopora 



bed, Devil's Backbone. 



7. Corallum possessing yery small cells. Cash Valley. 

 Helderberg formation, Keyser member. 



