PLATE XXXII 



PAGE 



Figs. 1, 2. AVICULOPECTEN PRIXCEPS (Conrad) 263 



1. External impression of a broken left valve. 



2. Left valve with broken margins. 



Romney formation, Hamilton member, Williams Road, % 

 mile east of Queen City Hotel, Cumberland. 



Figs. 3, 4. AVICULOPECTEX EQUILATERA (Hall) 265 



Two left valves showing variation in erectness of the shell. X 2. 

 Romney formation, Onondaga member, Blair County, Penna., 

 and Ridgeville, W. Va. (After Kindle.) 



Figs. 5-9. MODIOMORPHA CONCENTRICA (Conrad) i 266 



5, 6. Right and left valves. Evitts Creek. 



7, 8. Internal impression of right and left valves. Williams Road, 



east of Evitts Creek. 



9. Internal impression of right valve elongated by pressure, showing 

 anterior muscular scar. Western Maryland. 

 Romney formation, Hamilton member. 



115 



