110 BULLETIN" 53, UNITED STATES NATIONAL MUSEUM. 



46095. Byssonychia acutirostris Ulrich. Holotype. 



Lorraine (Ord.). Cincinnati, Ohio. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 634, pi. 45, figs. 8, 9; pi. 

 46, fig. 10. 



46096. Byssonychia alveolata Ulrich. Holotype. 



Lorraine (Ord.). Cincinnati, Ohio. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 631, pi. 48, figs. 1-3. 



46097. Byssonychia(P) byrnesi Ulrich. Cotypes. 



Trenton (Ord.). Covington, Kentucky. 



Ulrich, Geol. Surv. Ohio, VII, 1S93, p. 635, pi. 47, figs. 4, 5. 



46098. Byssonychia cultrata Ulrich. Cotypes. 

 46596. Richmond (Ord.). Waynesville, Ohio; Versailles, Indiana. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 632, pi. 45, figs. 5-7. 



46099. Byssonychia grandis Ulrich. Cotypes. 



46100. Richmond (Ord.). Oxford and Clarksville, Ohio. 



Ulrich, Geol. Sun.-. Ohio, VII, 1893, p. 631, pi. 46, figs. 6-9. 



46101. Byssonychia imbricata Ulrich. Holotype. 



Lorraine (Ord.). Cincinnati, Ohio. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 635, pi. 46, figs. 4, 5. 



46102. Byssonychia intermedia ( Meek and Worthen). Plesiotype. 



Trenton (Ord.). Near Wykoff, Minnesota. 



Ulrich, Geol. and Nat. Hist. Surv. Minn., Final Rept., Ill, Pt. II, 

 1894, p. 499> pl- 35, figs. 25, 26. 



46103. Byssonychia obesa Ulrich. Holotype. 



Richmond (Ord.). Richmond, Indiana. 



Ulrich, Geol. Surv. Ohio, VII, 1S93, p. 630, pl. 45, figs. 10, 11, 12. 



46104. Byssonychia praecursa Ulrich. Cotype. 



Lorraine (Ord.). Lorraine, New York. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 633, pl. 45, fig. 1. 



46105. Byssonychia radiata (Hall). Plesiotype. 



Lorraine (Ord.). Cincinnati, Ohio. 



Ulrich, Geol. and Nat. Hist. Surv., Minn. Final Rept., Ill, Pt. II, 

 1S94, p. 477, fig. 6. 



46106. Byssonychia richmondensis Ulrich. Holotype. 



Richmond (Ord. J. Richmond, Indiana. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 632, pl. 45, figs. 3, 4. 



46107. Byssonychia suberecta Ulrich. Cotypes. 



Richmond (Ord.). Versailles, Indiana. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 634, pl. 45, figs. 13-15. 



4610s. Byssonychia vera Ulrich. Cotypes. 



Utica (Ord.). Cincinnati, Ohio. 



Ulrich, Geol. Surv. Ohio, VII, 1S93, p. 629, text figs, a, b, c. 



