386 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



207. Mactra ( Cymbophora ?) siouxensis (Meek and Hayden). 



Cotypes and plastotypes. 

 Dakota (Cret.). Big Sioux River, two miles above its 

 mouth, South Dakota. 



Meek, Rept. U. S. Geol. Sun'. Terr., IX, 1876, p. 206, pi. 1, figs. 

 7b, 7c. 



See Mactra siouxensis. 



9855. Mactra texana Conrad. Cotypes. 



Eocene? Prairie between Laredo and Rio Grande City, 

 Texas. 



Conrad, Rept. U. S. Mexican Bound. Surv.. Emory, I, Pt. II, 1857, 

 p. 148, pi. 4, figs, ia, ib. 



153742. Mactra ( Mactrotoma ) undula Dall. Holotype. 



Pliocene. Near Darlington Court House, South Carolina. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1898, p. 

 893, pi. 28, fig. 12. 



7854. Mactra ( Cymbophora? ) utahensis Meek. Cotypes. 



12530. Colorado (Cret.). East Canyon Creek, Wahsatch Range, 



and near Coalville, Utah. 



Meek, Rept. U. S. Geol. Expl. 40th Par., IV, Pt. I, 1877, p. 155, 

 pi. 15, figs. 9-gb. — Stanton, Bull. No. 106, U. S. Geol. Surv., 

 1893, p. 120, pi. 27, figs. 16, 17. 



304. Mactra warrenana Meek and Haj'den. Holotype 



and paratypes. 

 Fox Hills (Cret. ). Moreau River, South Dakota. 



Meek and Hayden, Proc. Acad. Nat. Sci. Phila., VIII, 1856, p. 271. 



304. Mactra (Cymbophora ? ) warrenana (Meek and Hayden). 



Holotype and paratypes. 

 Fox Hills (Cret.). Yankton, South Dakota. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, p. 208, pi. 30, 

 figs. 7a-d. 



153748. Mactra 1 Mactrotoma) willcoxii Dall. Holotype. 



Pliocene. Myakka River, Florida. 



Dall. Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1898, p. 894, 

 pi. 28, figs. 10, 11. 



1 15653. Mactrinula macescens Guppy. Cotypes. 



Eocene. Manzanilla, Trinidad, British West Indies. 



Guppy, Quart. Journ. Geol. Soc. London, XXII, 1866, p. 5S1, 

 pi. 26, figs. 2a-2C 



158265. Madracis ganei Vaughan. Cotypes. 



Claibornian (Eocene). Natchitoches, Louisiana. 



Vaughan, Mon. XXXIX, T". S, Geol. Surv., 1900, p. 128, pi. 13, 

 figs. 1-7. 



