PLATE L 



PAGE 



Figs. 1-3. SCHUCHERTELLA CHEMUNGENSis (Conrad) 559 



1. Dorsal valve. Deer Park. 



2. Dorsal valve showing impress of cardinal process. Top of Polish 



Mountain. 



3. Internal cast of a very broad ventral valve. Near Deer Park. 



Jennings formation, Chemung member. 



Fig. 4. SCHUCHERTELLA ELLIPTICA n. Sp 560 



Cast of interior of ventral valve. Jennings formation, Chemung mem- 

 ber, Town Creek, 4631. 



Fig. 5. SCHUCHERTELLA (?) PONDEROSA n. SP 560 



Cast of interior of a distorted ventral valve showing muscular scars. 

 Jennings formation, Chemung member, National Road, east of 

 Millstone, 2444. 



Figs. 6-10. CHONETES LEPIDIFORMIS n. sp 561 



6. Ventral valve retaining long cardinal spines and showing the sur- 



face characters. X 3. National Road, Polish Mountain. 



7. Internal cast of ventral valve. X 2. Same locality as preceding. 



8. Very large ventral valve. X 2. 



9. Internal cast of ventral valve. X 3. 



10. More transverse ventral valve. X 3. Figs. 8, 9, and 10 are from 

 National Road, east of Millstone. 



Jennings formation, Parkhead member. 



Figs. 11-13. CHONETES SCITULUS Hall 563 



11. Ventral valve. X 2. Near base of Parkhead member, cut of 



Baltimore and Ohio Railroad, Rocky Run, 7 miles southeast of 

 Cumberland. 



12. Cast of interior of ventral valve showing papillose surface. X 2. 



Same locality. 



13. Ventral valve having finer striae. Williams Road, Polish Mountain, 



1422. 

 Jennings formation, Parkhead member. 



Figs. 14-18. CHONETES OAKLANDENSIS n. sp 562 



14-16. Three ventral valves. X 2. 

 17, 18. Two dorsal valves. X 2. 



Jennings formation, Chemung member, Green Glade Run, 

 near Deer Park. 



Fig. 19. CHONETES ROWEI n. sp 563 



Ventral valve showing irregular bifurcating spinulose plications. X 3. 

 National Road, east of Millstone. Jennings formation, Park- 

 head member. 



Figs. 20-22. PRODUCTEIXA LACHRYMOSA (Conrad) 564 



20. Ventral valve of typical form. Sideling Hill Creek, 2% miles above 



mouth, 1700. 



21. Ventral valve of small individual. Williams Road, Polish Moun- 



tain, 1660. 



22. Ventral valve upon which spines are somewhat closer than usual. 



Same locality as preceding. 

 Jennings formation, Parkhead member. 



133 



