PLATE XXII 



PAGE 



Figs. 1, 2. ORTHONOTA (?) PARVULA Hall 217 



1. Both valves. X 2. 



2. Dorsal view of same. X 2. 



Romney formation, Hamilton member, Evitts Creek. 



Fig. 3. GRAMMYSIA BISULCATA (Conrad) 218 



Ventral view of distorted and crushed specimen, showing part of both 

 valves. Romney formation, Hamilton member, McCoys Ferry. 



Figs. 4-10. GRAMMYSIA ARCUATA (Conrad) 219 



4. Anterior end of right valve. McCoys Ferry. 



5. Posterior end of left valve of same specimen. 



6. 7. Cardinal and ventral views of a specimen vertically compressed. 



Pine Hill, 5 miles north of Oldtown. 

 8. Right valve distorted by vertical pressure. Town Creek, about 6 



miles north of Oldtown. 



Romney formation, Hamilton member. 

 9, 10. Right and left valves. Hamilton formation, New York. 



Figs. 11, 12. TELLIXOPSIS SUBEMARGIXATA (Conrad) 222 



11. Left valve. Evitts Creek. 



12. Part of left valve showing fine radiating striae. Right bank of 



Potomac, about 3 miles below Cumberland. 

 Romney formation, Hamilton member. 



105 



