PLATE XI 



PAGE 



Figs. 1-5. LEPT/ENISCA AUSTRALIS Kindle 143 



1-3. Ventral valves. Fig. 1X2. Berkeley Springs, W. Va. 



4. Type specimen, ventral valve. X 2. Berkeley Springs, W. Va. 



5. Interior of dorsal valve. New Bloomfield, Pa. 



Romney formation, Onondaga member. (After Kindle.) 



Figs. 6-10. SCHUCHEBTELLA vARiABiLis Prosser n. sp 144 



6. Dorsal valve ( ?). Williams Road, % mile east of Queen City Hotel, 



Cumberland. 



7. Ventral valve. X I 1 /!. Same locality. 



8. Portion of same enlarged to show character of striae. X 4. 



9. Dorsal valve (?). 



10. Portion of same enlarged to show regular variation in strength of 

 radiating striae. X 4. 



Romney formation, Hamilton member. 



Figs. 11-1 7. CHONETES MUCBONATUS Hall 146 



11. Ventral valve. X 2. McCoys Ferry. 



12. Ventral valve, showing two spines near each cardinal angle. X 2. 



Same locality. 



13. Partly exfoliated interior of ventral valve, showing cardinal spine. 



X 2. Same locality. 



14. Interior of ventral valve showing muscular impressions and one 



cardinal spine. X 2. Same locality. 

 Romney formation, Hamilton member. 



15. Dorsal valve, showing cardinal spines. Hamilton formation, New 



York. 



16. Small pedicle valve. X 3. Cumberland. 



17. A pedicle valve of average size and appearance, showing the long 



spines. X 2. Cumberland. 

 Romney formation, Onondaga member. (After Kindle.) 



Figs. 18-21. CHONETES COBOXATUS (Conrad) 148 



18. Partly exfoliated ventral valve, showing shallow median sinus and 



cardinal spines. Evitts Creek. 



19. Interior of ventral valve, showing pustulose pittings toward margin 



of shell. Hancock-Harrisouville Road, about 2 miles north of 

 Hancock. 



20. Dorsal valve. Hancock-Harrisonville Road, about 2 miles north of 



Hancock. 



21. Interior of ventral valve showing pustulose pittings. McCoys 



Ferry. 

 Romney formation, Hamilton member. 



Figs. 22-25. CHOXETES SETIGER (Hall) 152 



22. Ventral valve, partly exfoliated. X 2. Iron Bridge over Town 



Creek, northeast of Oldtown. 



23. Dorsal valve. X 1%. West of Tonoloway Ridge. 



24. Interior of ventral valve, showing pustulose pittings toward margin 



of shell. X 1%. McCoys Ferry. 



Romney formation, Hamilton member. 



25. Ventral valve showing cardinal spines. X 2. Hamilton formation, 



New York. 



