II ADVERTISEMENT. 
VI. Contributions to the Knowledge of the Older Mesozoic Flora of Virginia, by William Morris 
Fontaine. 1883. 4°. xi, 144 pp. 541. 54 pl. Price $1.05. 
VII. Silver-Lead Deposits of Eureka, Nevada, by Joseph Story Curtis. 1884. 4°. xiii, 200 pp. 
16 pl. Price $1.20. 
VIII. Paleontology of the Eureka District, by Charles Doolittle Walcott. 1884. 4°. xiii, 298 pp. 
241. 24pl. Price $1.10. 
IX. Brachiopoda and Lamellibranchiata of the Raritan Clays and Greensand Marls of New Jersey, 
by Robert P. Whitfield. 1885. 4°. xx, 338 pp. 35 pl. Il map. Price $1.15. 
X. Dinocerata. A Monograph of an Extinct Order of Gigantic Mammals, by Othniel Charles 
Marsh. 1886. 4°. xviii, 243 pp. 561. 56pl. Price $2.70. 
XI. Geological History of Lake Lahontan, a Quaternary Lake of Northwestern Nevada, by Israel 
Cook Russell. 1885. 4°. xiv, 288 pp. 46 pl. and maps. Price $1.75. 
XII. Geology and Mining Industry of Leadville, Colorado, with atlas, by Samuel Franklin Em- 
mons. 1886. 4°. xxix, 770 pp. 45 pl. and atlas of 35 sheets folio. Price $38.40, 
XIII. Geology of the Quicksilver Deposits of the Pacific Slope, with atlas, by George F. Becker. 
1888. 4°. xix, 486 pp. 7 pl. and atlas of 14 sheets folio. Price $2.00. 
XIV. Fossil Fishes and Fossil Plants of the Triassic Rocks of New Jersey and the Connecticut 
Valley, by John S. Newberry. 1888. 4°. xiv, 152 pp. 26 pl. Price $1.00. 
XV. The Potomac or Younger Mesozoic Flora, by William Morris Fontaine, 1889. 4°. xiv, 
377 pp. 180 pl. Text and plates bound separately. Price $2.50. 
XVI. The Paleozoic Fishes of North America, by John Strong Newberry. 1889. 4°. 340 pp. 
53 pl. Price $1.00. 
In press: 
I. Lake Bonneville, by G. K. Gilbert. 
In preparation : 
—Description of New Fessil Plants from the Dakota Group, by Leo Lesquereux. 
—Gasteropoda of the New Jersey Cretaceous and Eocene Marls, by R. P. Whittield. 
—Geology of the Eureka Mining District, Nevada, with atlas, by Arnold Hague. 
—Sauropoda, by O. C. Marsh. 
—Stegosauria, by O. C. Marsh. 
—Brontotheridw, by O. C. Marsh. 
—The Penokee Iron Bearing Series of Northern Wisconsin and Michigan, by Roland D. Irving 
and C. R. Van Hise. 
—Report on the Denver Coal Basin, by 8. F. Emmons. 
—Report on Silver Cliff and Ten-Mile Mining Districts, Colorado, by S. F. Emmons. 
—Flora of the Dakota Group, by J. S. Newberry. 
—The Glacial Lake Agassiz, by Warren Upham. 
—Geology of the Potomac Formation in Virginia, by W. M. Fontaine. 
BULLETINS. 
1. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitie Rocks, by Whitman Cross, with 
a Geological Sketch of Buffalo Peaks, Colorado, by 8. F. Emmons. 1883. 8°. 42 pp. 2 pl. Price 10 
cents. 
2. Gold and Silver Conversion Tables, giving the coining values of troy ounces of fine metal, ete., 
corputed by Albert Williams, jr. 1853. 5°. 8 pp. Price 5 cents. 
3. On the Fossil Faunas of the Upper Devonian, along the meridian of 76° 30/, from Tompkins 
County, N. Y., to Bradford County, Pa., by Henry S. Williams. 1884. 8°. 36 pp. Price 5 cents. 
4. On Mesozoic Fossils, by Charles A. White. 1884. 8°. 36 pp. 9 pl. Price 5 cents. 
5. A Dictionary of Altitudes in the United States, compiled by Henry Gannett. 1884. 8°. 325 pp. 
Price 20 cents. 
6. Elevations in the Dominion of Canada, by J. W. Spencer. 1884. 8°. 43 pp. Price 5 cents. 
7. Mapoteca Geologica Americana. A Catalogue of Geological Maps of America(North and South), 
1752-1881, in geographic and chronologic order, by Jules Marcon and John Belknap Marcon. 1884, 
8°. 184 pp. Price 10 cents. 
8. On Secondary Enlargements of Mineral Fragments in Certain Rocks, by R. D. Irving and C.R. 
Van Hise. 1884. 8°. 56 pp. 6pl. Price 10 cents. 
9, A Report of work done in the Washington Laboratory during the fiscal year 1883~e84. F. W. 
Clarke, chief chemist; T. M. Chatard, assistant chemist. 1884. 8°. 40 pp. Price 5 cents. 
10. On the Cambrian Faunas of North America. Preliminary studies, by Charles Doolittle Wal- 
cott. 1884. 8°. 74 pp 10pl. Price 5 cents. 
11. On the Quaternary and Recent Mollusca of the Great Basin; with Descriptions of New Forms, 
by R. Ellsworth Call. Introduced by a sketch of the Quaternary Lakes of the Great Basin, by G. K. 
Gilbert. 1884. 8°. 66 pp. 6pl. Price 5 cents. 
12. A Crystallographic Study of the Thinolite of Lake Lahontan, by Edward 8. Dana. 1884. 8°. 
34 pp. 3pl. Price 5 cents. 
13. Boundaries of the United States and of the several States and Territories, with a Historical 
Sketch of the Territorial Changes, by Hevry Gannett. 1885. 8°. 135 pp. Price 10 cents. 
14. The Electrical and Magnetic Properties of the Iron-Carburets, by Carl Barus and Vincent 
Strouhal. 1885, 8°. 238 pp. Price 15 cents. 
