PLATE LXII 



PAGE 



Figs. 1-3. LUNULICARDIUM ENCRiNiTUM Clarke 630 



1. Left valve showing the finely lineate surface. X 3. Town Creek, 



Gilpin, Allegany County. 



2. Same. X 2. Wolfe Mills, near Cumberland. 



3. Same. X 3. Allegany County. 



Jennings formation, Genesee member. 



Fig. 4. LUNULICARDIUM CYMBULA n. sp G31 



The single valve observed. X 5. Jennings formation, Genesee mem- 

 ber, near Corriganville. 



Figs. 5-7. PTEROCH^NIA FRAGILIS (Hall) 632 



5. Right valve showing the smooth concentrically lined surface and 



the sica. X 3. Jennings formation, Woodmont member, Naples 

 fauna, Town Creek, Gilpin. 



6, 7. Right and left valves. X 3. Jennings formation, Genesee mem- 



ber, west of Corriganville. 



FigS. 8, 9. ECTENODESMA BIROSTRATUM Hall 633 



8. Cast of interior of left valve. The wings of this specimen are 



broken. Jennings formation, Woodmont member, Ithaca fauna, 

 Little Orleans, Wagon Road, north of Western Maryland R. R. 



9. Left valve. Chemung formation, New York. 



Figs. 10-12. LIOPTERIA BIGSBYI Hall 634 



10, 11. Left and right valves. Hamilton or Ithaca, Schoharie, New 



York. 



12. Left valve doubtfully referred to this species. Jennings forma- 

 tion, Chemung member, National Road, Polish Mountain, 2714. 



Figs. 13, 14. LIOPTERIA MARYLAXDICA n. sp 635 



Casts of interior of two left valves. Jennings formation, Chemung 

 member, Town Creek, 2023. 



145 



