PLATE LXX 



PAGE 



Figs. 1-3. PLATYCERAS COMPKESSUM n. sp 683 



Three views of type. Jennings formation, Chemung member, west of 

 Green Ridge, near Pennsylvania line. 



Figs. 4-6. ORTHONYCHIA PROSSERI n. sp 681 



Three views of internal cast. Jennings formation, Chemung member, 

 National Road, 6 miles west of Frostburg. 



Figs. 7-9. ORTHONYCHIA UNGUICTJLATA n. sp 682 



Three views of type. Jennings formation, Parkhead member, Williams 

 Road, Polish Mountain, 1660. 



Figs. 10, 11. ORTHONYCHIA sp 682 



Enlargement of internal cast. X 2. Jennings formation, Parkhead 

 member, Sideling Hill Creek, 2 l / 2 miles above mouth, 1700. 



Figs. 12-16. PLATYCERAS MARYLANDICUM n. sp 683 



12, 13. Two views of a small individual. Parkhead member, Williams 



Road, Polish Mountain, 1660. 



14-16, Three views of type specimen. Chemung member, same locality, 

 2042. 

 Jennings formation. 



Figs. 17-19. DIAPHOROSTOMA LINEATUM (Conrad) 684 



17, 18. Two views of same shell. 



19. Portion of surface enlarged X 7. 



Jennings formation, Chemung member, west of Green Ridge, 

 near Pennsylvania line. 



Figs. 20-23. TENTACULITES DESCISSUS n. sp 686 



20. A full grown example showing the subequal rings of early growth 



and the alternation in size in later stages. X 2. Green Ridge, 

 Allegany County. 



21. A small example. Western Maryland. 



22. 23. Fragments of the apical parts of the tubes with only the sub- 



equal rings present. X 5. 



Jennings formation, Chemung member, Deer Park. 



Fig. 24. TENTACTTLITES SPICTJLUS Hall 687 



Shell enlarged X 5. Jennings formation, Woodmont member, Ithaca 

 fauna, National Road, east of Millstone, 795. 



153 



