PLATE LXIX 



PAGE 



Figs. 1, 2. LOXONEMA HAMILTONI,E Hall 676 



1. Dorsal view of a small specimen. X 2. Western Maryland Railroad, 



2 miles west of Pawpaw, 1597. 



2. Dorsal view of a larger individual of the usual proportions. Same 



locality, 1485. 

 Jennings formation, Parkhead member. 



Figs. 3-7. LOXONEMA TEREBRUM Hall 676 



3. Dorsal view of a nearly complete example. National Road, 6 miles 



west of Frostburg. 



4. Dorsal view of a small shell. Same locality. 



5. A portion of the exterior. Same locality. 



6. Part of an internal cast. Glade Run. 



7. External and internal cast of a specimen. Same locality. 



Jennings formation, Chemung member. 



Figs. 8-10. LOXONEMA STYLIOLUM Hall 676 



8. 9. Dorsal view of exteriors of shells upon which ornamentation is 



not preserved. 



10. Internal cast of apical portion. 



Jennings formation, Chemung member, Town Creek, 2238. 



Figs. 11-14. LOXONEMA ( ?) GLABRUM n. sp 677 



11. Internal cast. Williams Road, Polish Mountain, 1660. 



12. Dorsal view of exterior. Same locality. 



13. Internal cast. Sideling Hill Creek, 2 l / 2 miles above mouth, 1700. 



14. Dorsal view of exterior of a shell probably of this species. Wil- 



liams Road, Polish Mountain. 



Jennings formation, Parkhead member. 



Figs. 15, 16. TRACHYODOMIA PRECURSOR (Clarke) 678 



Ventral and dorsal views of shell. X 1%. This is a barite replacement 

 of the fossil from the Portage formation, Naples beds, Honeoye 

 Lake, New York. 



Figs. 17, 18. HOLOPEA ROWEI n. sp 679 



17. Internal cast of a large specimen. 



18. Dorsal view. 



Jennings formation, Chemung member, Williams Road, Polish 

 Mountain. 



Figs. 19, 20. HOLOPEA MARYLANDICA n. sp 680 



Dorsal views showing variations in form. Jennings formation, Che- 

 mung member, Williams Road, Polish Mountain. 



Fig. 21. HOLOPEA HUMILIS n. sp 680 



Internal cast of type. Jennings formation, Parkhead member, 2 miles 

 north of mouth of Town Creek, 1716. 



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