II ADVERTISEMENT. 
IX. Brachiopoda and Lamellibrancbiata of the Raritan Clays and Greensand Marls of New Jersey, 
by Robert P. Whitfield. 1885. 4°. xx, 338 pp. 35 pl. 1 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. 56 pl. Price $2.70. 
XI. Geological History of Lake Lahontan, a Quaternary Lake of Northwestern Nevada, by Israel 
Cook Russell. 1585. 4°. xiv, 288pp. 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 $3.40. 
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 8S. Newberry. 1888. 4°. xiv, 152 pp. 26 pl. Price $1.00. 
Tu preparation: 
XV. Younger Mesozoic Flora of Virginia, by William M. Fontaine. 
XVI. Paleozoic Fishes of North America, by J. S. Newberry. 
XVII. Description of New Fossil Plants from the Dakota Group, by Leo Lesquereux. 
—Gasteropoda of the New Jersey Cretaceous and Eocene Marls, by R. P. Whitfield. 
—Geology of the Eureka Mining District, Nevada, with atlas, by Arnold Hague. 
—Lake Bonneville, by G. K. Gilbert. 
—Sauropoda, by O. C. Marsh. 
—Stegosauria, by O. C. Marsh. 
—Brontotheridw, by O. C. Marsh. . 
—The Penokee-Gogebic Iron- Bearing Series of North Wisconsin and Michigan, by Roland D, Irving. 
—Report on the Denver Coal Basin, by 8. F. Emmons. 
—Report on Silver Cliff and Ten-Mile Mining District, Colorado, by S. F. Emmons. 
—Flora of the Dakota Group, by J. 8. Newberry. 
—The Glacial Lake Agassiz, by Warren Upham. 
—Geology of the Potomac Formation in Virginia, by W. M. Fontaine. 
BULLETINS. 
Each of the Bulletins contains but one paper and is complete in itself. They are, however, num- 
bered in a continuous series, and may be bound in volumes of convenient size. To facilitate this, each 
Bulletin has two paginations, one proper to itself and another which belongs to it as part of the volume. 
1. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, with 
a Geological Sketch of Buffalo Peaks, Colorado, by 8. F. Emmons. 1883. 6°. 42 pp. 2 pl. Price 10 
cents, 
2, Gold and Silver Conyersion Tables, giving the coining values of troy ounces of fine metal, etc., 
computed by Albert Williams, jr. 1583. 8°. 8pp. 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 8. Williams. 1884. 8°. 36 pp. Price 5 cents. 
4. On Mesozoic Fossils, by Charles A. White. 1884. 8°. 36 pp. 9pl. 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 Seamonint North and South), 
1752-1881, in geographic and chronologic order, by Jules Marcou and John Belknap Marcon. 1884. 
x°.* 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°. 56pp. 6pl. Price 10 cents. 
9, A Report of work done in the Washington Laboratory during the fiscal year 188334. FP. 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. Gpl. Price 5 cents. 
12. A Crystallographie 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 Irou-Carburets, by Carl Barus and Vincent 
Strouhal. 1885. 8° 238 pp. Price 15 cents. 
15. On the Mesozoic and Cenozoic Paleontology of California, by Charles A. White. 1885. 8°. 
33 pp. Price 5 cents. 
16. On the Higher Devonian Faunas of Ontario County, New York, by John M. Clarke, 1885. 8°. 
86 pp. 3pl. Price 5 cents. 
17. On the Development of Crystallization in the Igneous Rocks of Washoe, Nevada, with Notes 
on the Geology of the District, by Arnold Hague and Joseph P. Iddings. 1585, 8°. 44 pp. Price 5 
cents, 
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