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PLATE LXV 



PAGE 



Figs. 1-6. UXCIXULUS GORDOXI Maynard n. sp ........................... 367 



1, 2. Dorsal and ventral views. 



3, 4. Anterior and ventral views of a smaller specimen. 



5, 6. Anterior and side views of a gibbous form. . 



Helderberg formation, Keyser member, Cash Valley. 



Figs. 7, 8. UXCIXULUS KEYSEREXSIS Schuchert n. sp .................... 368 



Dorsal and side views. Helderberg formation, Keyser member, 

 Keyser, W. Va. 



Figs. 9-14. UXCIXULUS CONVEXORUS Maynard n. sp ...................... 368 



9. Dorsal view of individual with coarse plications. 

 10-13. Side, dorsal, ventral, and anterior views. 

 14. View of large ventral valve with fine plications. 



Helderberg formation, Keyser member, Keyser, W. Va. 



Figs. 15-17. WILSOXIA GLOBOSA Weller ................................. 369 



Side, dorsal, and ventral views. Helderberg formation, Keyser 

 member, Cash Valley. 



Figs. 18-20. WILSOXIA CF. GLOBOSA Weller .............................. 370 



Side, ventral, and dorsal views. Helderberg formation, Keyser mem- 

 ber, Tonoloway. 



Figs. 21, 22. EATOXIA SIXGULARIS (Vanuxem) ......................... 371 



Dorsal and ventral views. Helderberg formation, New Scotland mem- 

 her, Corriganville. 



Figs. 23-28. EATOXIA PECULIARIS (Conrad) ............................. 372 



23, 24. Dorsal and ventral views. 



25, 26. Interior of dorsal and ventral valves. (After Hall.) 

 Oriskany formation, Ridgely member, Cumberland. 

 27, 28. Ventral and dorsal views of internal cast. New Scotland forma- 

 tion, New York. 



Figs. 29, 30. EATOXIA WHITFIELDI Hall ................................ 373 



29. Ventral valve. X 2. 



30. A water-worn dorsal valve. X 2. 



Oriskany formation, Ridgely member, Cumberland. 



Figs. 31-35. EATOXIA MEDIALIS (Vanuxem) ............................ 374 



31. Dorsal view of a large specimen. 



32. 33. Ventral and side views. 



34, 35. Dorsal and ventral views of internal cast of a small individual. 

 New Scotland formation, New York. 



Figs. 36-38. EATOXIA SINUATA Hall .................................... 375 



36, 37. Dorsal and ventral views. 

 38. Interior of ventral valve. 



Oriskany formation, Ridgely member, Cumberland. 



