PLATE XCI 



PAGE 



Figs. 1-4. PHACOPS LOGANI Hall 497 



1. An entire specimen which has the head compressed from above, and 



the eyes slightly distorted. 



2. The head of a larger individual which shows the transverse furrows* 



and preserves the eyes in their proper form. 



3. View of the lower side of the head of another specimen, showing 



some crenulations along the marginal furrow. 



4. The eye enlarged. 



New Scotland formation, New York. 



Figs. 5-7. PHACOPS ? sp 498 



5. Cephalon exfoliated. 

 6,7. Pygidia. 



Oriskany formation, Ridgely member, Cumberland. 



Figs. 8, 9. DALMANITES KEYSERENSIS Swartz n. sp 499 



8. Cephalon of the type. 



9. Part of a pygidium probably belonging to the same species. 



Helderberg formation, Keyser member, Tonoloway. 



Figs. 10-11. DALMANITES MICRURUS (Green) 507 



10. A small pygidium. 



11. A larger pygidium from which the test has been removed, leaving 



the cast punctate. 

 New Scotland formation, New York. 



Figs. 12-15. DALMANITES MULTIANNULATUS Ohern n. sp 500 



12. Fragments of cheeks. 



13. Glabella. 



14. Eye and part of cheek. 



15. Genal angle. 



Oriskany formation, Knobly Mountain, near Cumberland. 



Fig. 16. DALMANITES ASPINOSUS Weller 499 



Exfoliated pygidium. Helderberg formation, Keyser member, Cash 

 Valley. 



