PLATE LXXVI 



PAGE 



Fig. 1. PALEOPINNA LATA Ohern n. sp 454 



Left valve. Oriskany formation, Ridgely member, Hancock. 



Figs. 2-4. ACTINOPTERIA COMMUNIS (Hall) 455 



2. Left valve of a large specimen. Helderberg formation, New Scot- 

 land member, Cumberland. 



3, 4. Left and right valves. Oriskany formation, Ridgely member, 

 Cumberland. 



Fig. 5. ACTINOPTERIA TEXTILIS (Hall) 456 



Left valve. Helderberg formation, New Scotland member, Cumber- 

 land. 



Fig. 6. ACTIXOPTERIA RETICULATA Weller 459 



Left valve. Helderberg formation, Keyser member, Keyser, W. Va. 



Fig. 7. AVICULA RECTICOSTA Hall 460 



Right valve. Oriskany formation, New York. 



07 



