620 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



8507. Spirigera subtilita (Hall). Plesiotypes. 



Upper Carboniferous. Exact locality unknown. 



White, Rept. U. S. Geogr. Surv. W. 100th Merid., IV, Pt. I, 1876, 

 p. 141, pi. 10, figs. 6a-6c. 



=Seminula subtilita. 



14688. Spirocyathus atlanticus (Billings). Plesiotype. 



15301. Lower Cambrian. Straits of Belle Isle, Labrador, and 



Silver Peak, Nevada. 



Walcott, Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 600, pi. 1, 

 figs, ib-d, 2, 2a. 



See Archaeocyathus atlanticus. 



23853. Spirodentalium osceola Walcott. Cotypes. 



Upper Cambrian. Osceola Mills, Wisconsin. 



Walcott, Proc. U. S. Nat. Mus., XIII, 1890, p. 271, pi. 20, fig. 12. 



270. Spironema tenuilineata (Meek and Hay den). Holotype. 



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



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, p. 342, pi. 32, 

 figs. 9a-c. 



See Turbo tenuilineatus. 



1 15428. Spirorbis clymenioides Guppy. Holotype. 



Eocene. San Fernando, Trinidad, British West Indies. 



Guppy, Quart. Journ. Geol. Soc. London, XXII, 1866, p. 584, 

 pi. 26, fig. 10. 



9073. Spirorbis ? dickhauti White. Cotypes. 



Eocene. Little Rock, Arkansas. 



White, Proc. U. S. Nat. Mus., Ill, 1880,' p. 161. 



=Tubulostium dickhauti. 



164882. Spisula callistaeformis Dall. Holotype. 



Eocene. Chicagof Cove, Alaska. 



Dall, Harriman Alaska Exped., IV, 1904, p. 108, pi. 9, fig. 9. 



1 15067. Spisula (Hemimactra) curtidens Dall. Cotypes. 



Miocene. Magnolia, Duplin County, North Carolina. 



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

 p. 898, pi. 27, figs. 2, 24. 



153779. Spisula (Hemimactra) delumbis Conrad. Plesiotypes. 



Miocene. York River, Virginia. 



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

 p. S97, pi. 27, fig. 26. 



135906. Spisula (Hemimactra) densa Dall. Holotype. 



Oligocene. Oak Grove, Santa Rosa County, Florida. 



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

 p. 900, pi. 27, fig. 22. 



