620 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



8507. Spirigera subtilita ( Hall). Plesiotypes. 



Upper Carboniferous. Exact locality unknown. 



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

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



= Seminula .subtilita. 



14688. Spirocyathus atlanticus ( Billings). Plesiotype. 



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



Silver Peak, Nevada. 



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

 figs, ib-cl, 2, 2a. 



See Archaiocj'athus 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 Hayden). Holotype. 



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



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

 figs. 9a-c. 



See Turbo teuuilineatus. 



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. Eittle Rock, Arkansas. 



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

 = Tubulo.stium dickhauti. 



164882. Spisula callistaeformis Dall. Holotype. 



Eocene. Chicagof Cove, Alaska. 



Uall, Ilarriman 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. vSci. 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. vSci. Phila., Ill, Pt. IV, 1898, 

 p. 897, pi. 27, fig. 26. 



135906. Spisula (Hemimactra) densa Dall. Holotype. 



Oligocene. Oak Grove, Santa Rosa County, Florida. 



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

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



