PLATE XLVII 



PAGE 

 Figs. 1-5. LINGULA OHERNI n. sp 546 



1. Small shells probably young of this species. 



2. Single valve from preceding group. X 6. 



3-4. Exteriors of valves showing slight differences of form. 



5. Interior of valve. 



Jennings formation, Parkhead member, Williams Road, S 1 /^ 

 miles east of Cumberland, 1393. 



Figs. 6, 7. LINGULA LIGEA Hall 547 



6. Exterior of valve. X 3. 



7. Exterior of valve which differs slightly in form. X 3. 



Jennings formation, Woodmont member, National Road, east 

 of Hancock, 1564 to 1599. 



Fig. 8. LINGULA SPATULATA Vanuxem 548 



Exterior of valve. X 6. Jennings formation, Woodmont member, 

 Ithaca fauna, National Road, east of Hancock, 1149 to 1274. 



Figs. 9, 10. OEBICULOIDEA CF. MEDIA (Hall) 549 



9. Dorsal valve. Chemung formation, New York. 



10. Dorsal valve somewhat distorted. Jennings formation, Parkhead 

 member, Williams Road, 3% miles east of Cumberland, 1393. 



Figs. 11-13. CBAINELLA HAMILTOXI^E Hall 549 



11. Cast of interior of dorsal valve. The vascular markings are visible 

 upon cast, but are not shown in figure. Jennings formation, 

 Parkhead member, Williams Road, Polish Mountain, 1660. 

 12, 13. Exterior and cast of interior of dorsal valve. Jennings forma- 

 tion, Chemung member, Ellerslie, Penna., 1474. 



Fig. 14. STBOPHEODONTA DEMISSA (Conrad) 551 



Dorsal view of shell. Jennings formation, Woodmont member, Ithaca 

 fauna, Hancock-Harrisonville Road, 2 miles north of Hancock, 

 882. 



Figs. 15-18. STROPHEODONTA MAYNARDI n. sp 551 



15. Ventral valve of type. 



16. Dorsal valve. 



17. Enlargement of cast of portion of interior of dorsal valve. X 2. 



18. Enlargement of a portion of a cast of the interior of the ventral 



valve showing hinge and muscular scars. X 2. 



Jennings formation, Chemung member, Town Creek, 2391. 



130 



