36 
Plate III 
Slab of Devonian limestone showing interiors and exteriors of more common fossils: X from 
top of gypsum cliffs below Peace point. 1, Schizophoria striatula, interiors of dorsal and ventral 
valves; 2, Cyrtina billingsi, interior of ventral valve; 3, Atrypa reticularis. (Page 16. ) 
