PLATE LXIV 



PAGE 

 Fig. 1. ACTINOPTERIA CF. EPSILON Hall 642 



A large left valve, showing radial lines. Ithaca beds, Ithaca, N. Y. 



Fig. 2. ACTINOPTERIA BOYDI (Conrad) 642 



Left valve, outline restored. Jennings formation, Woodmont member, 

 Ithaca fauna, Woodmont, 1170. 



Figs. 3-5. SCHIZODUS CHEMUNGENSIS (Conrad) 644 



3, 4. Casts of interior of right valve. 

 5. Cast of interior of left valve. 



Jennings formation, Chemung member, Town Creek, 3453. 



Fig. 6. SCHIZODUS CHEMUNGENSIS VAK. QUADRANGULARIS Hall 645 



Left valve. Jennings formation, Chemung member, near Deer Park. 



Figs. 7-14. SCHIZODUS OHERNI n. sp 646 



7. Left valve. 



8. Cast of interior of right valve of more circular shape than usual. 

 9, 10. Interior of left and right valves showing hinge. 



11. Cast of interior of right valve. 



Jennings formation, Parkhead member, National Road, east 

 of Millstone, 1781. 



12, 13. Cast of interior of very large left valves. 

 14. Posterior view of cast of valve shown in fig. 13. 



Jennings formation, Chemung member, Sideling Hill Creek. 



Fig. 15. SCHIZODUS FROSTBURGENSIS n. sp 647 



Cast of interior of left valve. Jennings formation, Chemung member. 

 National Road, 7 miles west of Frostburg. 



Figs. 16-18. SCHIZODUS TRIGONALIS n. sp 647 



16-17. Casts of interiors of left valves. Chemung member, Town 



Creek, 2228. 



18. Cast of interior of right valve, probably of this species. Parkhead 

 member, National Road, east of Millstone, 1781. 

 Jennings formation. 



147 



