PLATE LXI 



PAGE 



Figs. 1-3. PAL^ONEILO PLANA Hall 621 



1. Cast of interior of left valve. National Road, east of Millstone, 2322. 



2. Left valve. Associated with preceding. 



3. Cast of interior of a very elongate left valve probably of this species. 



Near Mr. Cheney's, 2% miles northeast of Pratt, at base of 

 section. 



Jennings formation, Chemung member. 



Figs. 4-6. PAI/^EONEILO BREVIS Hall 622 



4. 5. Casts of interiors of right and left valves. Parkhead member, 



Western Maryland Railroad, 2 miles west of Pawpaw, 1763. 



6. Cast of interior of left valve. Woodmont member, Ithaca fauna, 



Woodmont. 



Jennings formation. 



Figs. 7-10. PAi/yONEiix> CONSTRICTA (Conrad) 620 



7. Cast of interior of right valve. Jennings formation, Woodmont 



member, Ithaca fauna, Woodmont, 710. 

 8,9. Sculpture casts of right and left valves. Hamilton formation, 



western New York. 



10. Cast of left valve. Jennings formation, Chemung member, Green 

 Ridge. 



Figs. 11, 12. PAL^ONEILO FILOSA (Conrad) 623 



Two right valves. X 2. Jennings formation, Chemung member, near 

 Wills Creek Station, Penna. 



Fig. 13. PAI^EONEILO ANGUSTA Hall 624 



Left valve. Jennings formation, Chemung member, 1 mile southeast 

 of Sunnyside. 



FigS. 14, 15. PALyEONEILO CKASSA n. Sp 625 



14. Cast of interior of right valve of type. 



15. Dorsal view of internal cast. 



Jennings formation, Chemung member, Town Creek, 3584. 



Figs. 16, 17. LEDA CF. DIVERSA Hall 626 



16. Cast of interior of left valve. X 2. Town Creek, 3760. 



17. Cast of interior of left valve. X 2. Town Creek, 3870. 



Jennings formation, Chemung member. 



Fig. 18. MACRODON CHEMUNGENSIS Hall 627 



Cast of interior of left valve. Jennings formation, near base of Park- 

 head member, White Sulphur Branch, 4 miles southeast of Pratt. 



Figs. 19-21. PTERINEA NODOCOSTA n. sp 628 



19. A large left valve showing the coarse nodose ribs and finer inter- 



vening ones. Oakland. 



20, 21. Two rather imperfect and small left valves. Near Deer Park 



and Oakland. 



Jennings formation, Chemung member. 



Fig. 22. PTERINEA CHEMUNGENSIS (Conrad ) 629 



22. A left valve of normal character. Jennings formation, Chemung 

 member, National Road, 7 miles west of Frostburg. 



144 



