PLATE LXIX 



PAGE 



Figs. 1-3. SPIBIFEB VANUXEMI VAB. PROGXOSTICUS Schuchert n. var 403 



1. Dorsal view of a large specimen. X 2. 



2, 3. Anterior and side views of a smaller individual. X 2. 



Helderberg formation, Keyser member, Pinto. 



Figs. 4-6. SPIRIFEK PERLAMELLOSUS Hall 397 



Dorsal, ventral and side views. Helderberg formation, New Scotland 

 member, Cumberland. 



Fig. 7. SPIRIFEK ERIENSIS Grabau 404 



Ventral valve. Helderberg formation, Keyser member, Cash Valley. 



Figs. 8-10. SPIRIFER CYCLOPTERUS Hall 406 



8, 9. Dorsal and side views of average specimen. 

 10. Ventral valve of a smaller specimen. 



New Scotland formation, New York. 



Figs. 11-14. SPIRIFER TRIBULIS Hall 407 



11-13. Dorsal, ventral, and side views. 



14. A portion of the surface lamellae much magnified to show the 

 finely spinose margins. 



Helderberg formation, New Scotland member, Cumberland. 

 (After Hall.) 



Figs. 15, 16. SPIRIFER ANGULARIS Schuchert n. sp 409 



Dorsal and ventral views of a large specimen. Oriskany formation, 

 Ridgely member, Cumberland. 



Figs. 17-21. SPIRIFER INTERMEDIUS Hall 409 



17, 18. Ventral and dorsal views of Cumberland specimen. 



19. Ventral valve with a wider sinus. Cumberland. 



20, 21. Dorsal and ventral views of an average specimen from Warren 



Point, Penna. 

 Oriskany formation, Ridgely member. 



