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Figs. 1-4. DALMANITES (CRYPH^US) BOOTHI (Green) 333 



1. Partly exfoliated pygidium with marginal spines. X 1%. 



2. Another partly exfoliated and smaller pygidium. X 2. 



3. A pygidium and part of one side of a thorax. X 1%. 



Romney formation, Hamilton member, Evitts Creek. 



4. Internal surface of a pygidium, in which the spines are broad and 



flat. Hamilton formation, New York. 



Fig. 5. DALMANITES MARYLANDICUS Prosser n. sp 334 



Partly exfoliated pygidium, showing the pustulose surface and two 

 spines at the apex. Romney formation, Hamilton member, 

 Ernstville. 



Fig. 6. LEPEKDITIA ? SUBROTUNDA ; 335 



Right valve. X 20. Romney formation, Onondaga member, Little 

 Moccasin Gap, Va. (After Kindle.) 



Figs. 7, 8. BOLLIA UNGULA Jones 336 



7. Cast of a left valve. X 20. Rees Tannery, Mineral County, W. Va. 



8. Dorsal view of a slightly distorted specimen. X 20. Berkeley 



Springs, Ridgeville, W. Va. 



Romney formation, Onondaga member. (After Kindle.) 



Fig. 9. BOLLIA OBESA Ulrich 337 



Cast of left valve. X 20. New Bloomfield, Penna. Romney formation, 

 Onondaga member. (After Kindle.) 



