670 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



13410. Trochus ( Oxystele ) euryostomus White. Cotypes. 



Chico (Cret.). Todos Santos Bay, California. 



White, Bull. No. 22, U. $. Geol. Surv., 1885, p. 12, pi. 5, figs. 9-1 1. 



20120. Trochus (Anadema) gemiferus White. Holotype. 



Chico (Cret.). Near Pence's ranch, Butte County, Cali- 

 fornia. 



White, Bull. No. 51, U. S. Geol. Surv., 1889, p. 17, pi. 4, figs. 8, 9. 



2468. Trochus humilis Conrad. Holot)^pe. 



Miocene. St. Marys River, Maryland. 



Conrad, Journ. Acad. Nat. Sci. Phila., VI, 1S30, p. 219, pi. 9, 

 fig. 5.— Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. II, 



1892, p. 405. 



= Calliostoma (Eutrochus) humilis. 



115617. Trochus plicomphalus Guppy. Holotype. 



Pliocene. Matura, Trinidad, British West Indies. 



Guppy, Geol. Mag., London, Dec. II, I, 1874, p. 435, pi. 18, fig. 17. 



1498S. Trochus (Palaeotrochus) praecursor Clarke. Holotype. 



Naples (Dev. ). Naples, New York. 



Clarke, Bull. No. 16, U. S. Geol. Surv., 1885, p. 55, pi. 3, figs. 6-9. 

 — Palaeotrochus praecursor. 



23847. Trochus ? saratogensis Walcott. Cotypes. 



Upper Cambrian. Four miles west of Saratoga Springs, 

 New York. 



Walcott, Proc. U. S. Nat. Mus., XIII, 1890, p. 268, pi. 20, fig. 3. 



162545. Trophon (Boreotrophon ) cerritensis Arnold. Holotype. 



Pleistocene. Deadman Island, off San Pedro, California. 

 Arnold, Mem. Calif. Acad. Sci., Ill, 1903, p. 249, pi. 6, fig. 6. 



20122. Trophon condoni White. Cotype. 



Chico ( Cret. ) . Eighteen miles east of Redding, California. 



White, Bull. No. 51, U. S. Geol. Surv., 1889, p. 21, pi. 3, figs. 4, 5. 



1 13273. Trophon (Aspella) engonatus Dall. Cotypes. 



Pliocene. Shell Creek, De Soto County, Florida. 



• Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. II, 1892, p. 243, 



pi. 13, fig. 6a. 



162546. Trophon ( Boreotrophon 1 stuarti praecursor Arnold. 



Holotype. 

 Pliocene. Deadman Island, off San Pedro, California. 

 Arnold, Mem. Calif. Acad. Sci., Ill, 1903, p. 253, pi. 6, fig. 5. 



24340. Tropidocyclus gilletianus ( Hartt and Rathbun). 



Plesiotypes. 

 Middle Devonian. Erere, Brazil. 



Clarke, Archivos do Mus. Rio de Janeiro, X, 1899, p. 40, pi. 3, 

 figs. 10, 11. 



