PLATE LXXIX 



PAGE 



Figs. 1, 2. BELLEROPHOX CF. AURICULATUS Hall 465 



Dorsal and ventral views. Helderberg formation, Cumberland. 



Figs. 3, 4. BELLEROPHON HELDERBERGI.E Swartz n. sp 466 



Side and dorsal views of the type. Helderberg formation, Keyser 

 member, Cash Valley. 



Figs. 5, 6. CYRTOLITES EXPANSUS Hall 466 



Anterior and side views. Oriskany formation, New York. 



Fig. 7. LOXONEMA FITCHI Hall 467 



Cast somewhat flattened. New Scotland formation, New York. 



Fig. 8. LOXONEMA sp 468 



Internal cast. Helderberg formation, Keyser member, Cash Valley. 



Fig. 9. HoLOPEA sp 468 



Ventral view. Helderberg formation, Cumberland. 



Figs. 10-12. ORTHONYCHIA TORTUOSA (Hall) 469 



Views of shell in different positions. Oriskany formation, Ridgely 

 member, Cumberland. 



Figs. 13, 14. PLATYCERAS NODOSUM Conrad 469 



13. Large, partially exfoliated specimen. 



14. Internal cast of smaller specimen. 



Oriskany formation, Ridgely member, east side Nicholas 

 Mountain. 



