524 BULLETIN" 53, UNITED STATES NATIONAL MUSEUM. 



6568. Pleurotomaria inornata Meek. Holotype. 



Upper Carboniferous. Mortons Shaft, Nebraska City, 

 Nebraska. 



Meek, Final Rept. U. S. Geol. Surv. Nebr. (Hayden), 1872, p. 232, 

 pi. 4, fig. 14. 



34126. Pleurotomaria isaacsi Hall and Whitfield (?) Plesiotype. 

 Three Forks (Dev.). Wall Canyon, Clark Fork Valley, 

 Yellowstone National Park. 



Girty, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1899, p. 505, pi. 

 66, figs. 5a, 5b. 



1 733 1. Pleurotomaria lonensis Walcott. Cotype. 



Upper Pogonip (Ord.). Lone Mountain, near Eureka, 

 Nevada. 

 Walcott, Mon. VIII, U. S. Geol. Surv., 1S84, p. 80, pi. II, fig. 22. 



19506. Pleurotomaria marrotiana D'Orbigii5 r . Holotype. 



Turonien (Cret.). Riberac, Dordogne, France. 



D'Orbigny, Paleont. Francaise, Terr. Cret., II, 1842-43, p. 267, pi. 

 202, figs. 5, 6. 



3628. Pleurotomaria morrisiana McCoy. Plesiotypes. 



Carboniferous. Harpers Hill on the Hunter, New South 

 Wales, Australia. 



Dana, Wilkes U. S. Expl. Exped., X, 1849, p. 706, Atlas, pi. 9, 

 figs. 15, 15a, 16. 



17900. Pleurotomaria muralis Owen. Holotype. 



Ordovician. Lower Fort Garry, Red River of the North, 

 Manitoba, Canada. 



Owen, Rept. Geol. Surv. Wis., Iowa, and Minn., 1852, p. 581, 

 pi. 2, fig. 6. 



14413. Pleurotomaria nevadensis Walcott. Cot3'pe. 



Lower Carboniferous. Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 259, pi. 24, figs. 

 2, 2a. 



14414. Pleurotomaria nodomarginata McChesney. Plesiotype. 



Lower Carboniferous. Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 259, pi. 18, fig. 15. 



3661. Pleurotomaria nuda Dana. Holotype. 



Carboniferous. Harpers Hill on the Hunter, New South 

 Wales, Australia. 



Dana, Wilkes U. S. Expl. Exped., X, 1849, p. 706, Atlas, pi. 9, 

 figs. I7a-c. 



6598. Pleurotomaria perhumerosa Meek. Cotypes. 



7025. Upper Carboniferous. Mortons Shaft, Nebraska City, 



Nebraska, and Rulo, Kansas. 



Meek, Final Rept. U. S. Geol. Surv. Nebr. (Hayden), 1S72, p. 232, 

 pi. 4, figs. I3a-i3b. 



