PLATE XIX 



PAGE 



Figs. 1-7. SPIRIFEB TULLIUS Hall 195 



1. Interior of ventral valve. Hancock-Harrisonville Road, about 2 



miles north of Hancock. 



2. Interior of small ventral valve. X l 1 /^. Same locality. 



3. Exterior of ventral valve. Near Hancock. 



4. Interior of dorsal valve. Little Run, near Hancock. 



5. Cardinal view of ventral valve. Near Hancock. 



6. Enlargement of same, showing fine striae on sinus and plications. 



X 4i/ 2 . 

 Romney formation, Hamilton member. 



7. Dorsal valve of average specimen. Hamilton formation, New York. 



Figs. 8, 9. SPIRIFER ANGUSTUS Hall 196 



8. Cardinal view of internal cast. Warrior Mountain, east of Rush. 



Romney formation, Hamilton member. 



9. Dorsal valve of rather large individual. Hamilton formation, New 



York. 



Figs. 10-12. SPIRIFER (RETICULARIA) FIMBRIATUS (Conrad) 197 



10. Partly exfoliated dorsal valve. Evitts Creek. 



11. Cardinal view of internal cast. Hardy County, W. Va. 



12. An enlargement of the surface, showing the bases of the spinules. 



Romney formation, Hamilton member. 



Fig. 13. SPIRIFER CF. COXSOBRIXUS (d'Orbigny) 198 



Interior of ventral valve. Town Creek, 6 miles north of Oldtown. 

 Romney formation, Hamilton member. 



Figs. 14-16. SPIRIFER SCULPTILIS VAR. MARYLANDENSIS Prosser n. var 200 



14. Dorsal valve. Warrior Mountain, east of Rush. 



15. Squeeze of same. X 1%. 



16. Internal impression of same. 



Romney formation, Hamilton member. 



102 



