410 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



46341. Modiolopsis modioliformis Meek and Worthen. Plastotype. 

 Stones River (Ord.). Mineral Point, Wisconsin. 

 Meek and Worthen, Geol. Surv. 111., Ill, 1868, p. 294. 

 = Whiteavesia modioliformis. 



46250. Modiolopsis mytiloides Hall. Plesiotype. 



Trenton (Ord.). Wykoff, Minnesota. 



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

 1894, p. 508, pi. 36, fig. 8. 



46251. Modiolopsis nana Ulrich. Holotype. 



Trenton (Ord.). Cannon Falls, Minnesota. 



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

 II, 1894, p. 507, pi. 36, fig. 7. 



46252. Modiolopsis oblonga Ulrich. Holotype. 



Trenton (Ord.). West Covington, Kentucky. 

 Ulrich, Amer. Geol., V, 1890, p. 272, figs. ia-c. 



46253. Modiolopsis obsoleta Ulrich. Holotype. 



Black River (Ord.). Six miles south of Cannon Falls, 

 Minnesota. 



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

 II, 1894, p. 509, pi. 36, figs. 11, 12. 



17287. Modiolopsis occidens Walcott. Cotype. 



17288. Upper Pogonip (Ord.). Fish Creek Mountains, and L,one 



Mountain, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 77, pi. 1, fig. 5; 

 pi. 11, figs. 14, 14a, 



46197. Modiolopsis orthonota Meek and Worthen. Plastotype. 



Stones River (Ord.). Dunleith, Illinois. 



Meek and Worthen, Geol. Surv. 111., Ill, 1868, p. 295. 

 = Endodesma orthonotum. 



46231. Modiolopsis oviformis Ulrich. Holotype. 



Trenton (Ord.). Curdsville, Kentucky. 

 Ulrich, Amer. Geol., V, 1890, p. 276, figs. 4a-c. 

 = Modiolodon oviformis. 



46254. Modiolopsis oweni Ulrich. Holotype. 



Trenton (Ord.). Five miles south of Cannon Falls, Min- 

 nesota. 



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

 II, 1S94, p. 506, pi. 42, figs. 15, 16. 



46255. Modiolopsis parva Ulrich. Cotypes. 



46256. Trenton (Ord.). Burgin, Kentucky. 

 Utica (Ord.). Covington, Kentucky. 



Ulrich, Amer. Geol., V, 1890, p. 282, figs. 9a-!. 



