PLATE LX 



VAGE 

 FigS. 1-3. BUCHIOLA RETROSTRIATA (V. Buch) 613 



1. A large right valve, somewhat flattened. X 3. Barrelville Road, y 2 



mile west of Corriganville. 



2. A very small right valve with few broad flat ribs with coarse re- 



curved surface markings. X 5. Town Creek, Gilpin. 



3. An enlargement showing the smooth embryo shell and the abrupt 



introduction of the radial ornament in secondary growth, x 10. 

 Wolfe Mills, near Cumberland. 



Jennings formation, Genesee member. 

 Figs. 4-6. BUCHIOLA CONVERSA Clarke 615 



4. Right valve of type showing the elevated margins and concave sur- 



face of the ribs. X 3. Lower Falls of the Genesee River, New 

 York. Naples shales. 



5. 6. Left and right valves. X 5. 



Jennings formation, Woodmont member, Naples fauna, Town 

 Creek, Gilpin. 

 Figs. 7, 8. BUCHIOLA MARI.E n. sp 615 



7. Right valve. X 4. 



8. Smaller right valve. X 3. 



Jennings formation, Genesee member, Williams Road, Cum- 

 berland. 



Figs. 9-12. BUCHIOLA ? LIVONIA Clarke 616 



9. Right valve showing the numerous flattened ribs. X 4. Jennings 

 formation, Woodmont member, Naples fauna, National Road, 

 east of Town Creek, Gilpin. 



10. The two valves, normally expanded. Romney Road, 3% miles 



southeast of Burlington, W. Va. Jennings formation, Genesee 

 member. 



11. Right valve. X 4. Same locality as fig. 10. 



12. Left valve of the type specimen showing the fine concentric linea- 



tion of ribs. X 3. Styliola limestone of Genesee shales, Livonia 

 salt shaft, New York. 

 Figs. 13-16. PARACARDIUM DORIS Hall 617 



13. A small right valve. X 4. Wolfe Mills, near Cumberland. 



14. Both valves. X 4! Wolfe Mills, near Cumberland. 



15. A large right valve. X 4. West of Corriganville. 



16. The right valve. X 4. Same locality as fig. 15. 



Jennings formation, Genesee member. 

 Figs. 17, 18. PARACARDIUM DELICATULUM Clarke 618 



17. A valve with normal characters, somewhat deformed about the 



hinge. X 10. This is the type specimen. Styliola limestone of 

 the Genesee shale (Naples fauna). Canandaigua Lake, New 

 York. 



18. A right valve showing the extremely fine radial ribs, which are 



crossed by concentric lines, though these are made much too 

 strong in the drawing. X 10. 



Jennings formation, Genesee member, Wolfe Mills, near Cum- 

 berland. 

 Figs. 19-23. NUCULA CORBULIFORMIS Hall. . , 619 



19. Cast of interior of left valve. X 2. Woodmont member, Ithaca 



fauna, National Road, west of Tonoloway Ridge. 



20. Cast of interior of left valve. X 2. Woodmont member, Ithaca 



fauna, same locality as fig. 19. 



21. Enlargement of portion of exterior. X 8. Woodmont member, 



Ithaca fauna, Berkeley Springs, West Virginia, 1058. 



22. Right valve. Parkhead member, 2 miles north of mouth of Town 



Creek, 1716. 



23. Enlargement of cast of interior showing hinge. Parkhead member, 



Williams Road, Polish Mountain, 1352. 

 Jennings formation. 



Fig. 24. PAL^ONEILO PETILA Clarke ? 624 



Right valve. X 2. Jennings formation, Woodmont member, Naples 

 fauna, Williams Road, 3% miles east of Cumberland, 406. 



Fig. 25. PAL^EONEILO MAXIMA (Conrad) ? 622 



Cast of interior of right valve. 2 miles north of mouth of Town 

 Creek, Parkhead member, 1282. 

 Jennings formation. 



143 



