110 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



46095. Byssonychia acutirostris Ulrich. Holotype. 



Lorraine (Orel.). Cincinnati, Ohio. 



Ulrich, GeoL vSurv. Ohio, VII, 1S93, 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, 1S93, p. 631, pi. 48, figs. 1-3. 



46097. ByssonychiaC?) byrnesi Ulrich. Cotypes. 



Trenton (Orel.). Covington, Kentucky. 



Ulrich, Geol. vSurv. Ohio, VII, 1893, p. 635, pi. 47, figs. 4, 5. 



46098. Byssonychia cultrata Ulrich. Cotypes. 

 46596. Richmond (Ord.). Waynesville, Ohio; \'ersailles, Indiana. 



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



46099. Byssonychia grandis Ulrich. Cotype.s. 



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



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



46101. Byssonychia imbricata Ulrich. Holotj-pe. 



Lorraine (Ord.). Cincinnati, Ohio. 



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



46102. Byssonychia intermedia (Aleek and Worthen ) . Ple.siotype. 



Trenton (Ord.). Near Wykoff, Minnesota. 



Ulrich, Geol. and Nat. Hist. vSurv. Minn., Final Rept., Ill, I't. II, 

 1894, p. 499, pi. 35, figs. 25, 26. 



46103. Byssonychia obesa Ulrich. Holotype. 



Richmond (Ord.). Richmond, Indiana. 



Ulrich, Geol. Surv. Ohio, VII, 1893, p. 630, ])1. 45, figs. 10, 11, 12. 



46104. Byssonychia praecursa Ulrich. Cot^'pe. 



Lorraine (Ord.). Lorraine, New York. 



Ulrich, Geol. Surv. Ohio, VII, 1S93, p. 633, pi. 45, fig. i. 



46105. Byssonychia radiata ( Hall ). Plesiotype. 



Lorraine (Ord. 1. Cincinnati, Ohio. 



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



1894, p. 477. fiR- 6. 



46106. Byssonychia richmondensis Ulrich. Holotype. 



Richmond (Ord.). Richmond, Indiana. 



Ulrich. (reol. Surv. Ohio, \'I[, 1893, p. 632, pi. 45, figs. 3, 4. 



46107. Byssonychia suberecta Ulrich. Cot3'pes. 



Richmond (Ord.). Versailles, Indiana. 



Ulrich, Geol. Surv. Ohio, \'II, 1S93, p. 634, pi. 45, figs. 13-15. 



46iOcS. Byssonychia vera I'lrich. Cotypes. 



Utica (Ord.). Cincinnati, Ohio. 



Ulrich, Geol. Surv. Ohio, VH, 1893, p. 629, text figs, a, b, c. 



