II ADVERTISEMENT. 
MONOGRAPHS. 
I. Lake Bonneville, by Grove Karl Gilbert. 1890. 4°. xx,438pp. 51pl. 1lmap. Price $1.50. 
Il. Tertiary History of the Grand Canon District, with atlas, by Clarence EK. Dutton, Capt., U.S. A. 
1882. 4°. xiv, 264 pp. 42 pl. and atlas of 24 sheets folio. Price $10.00. 
III. Geology of the Comstock Lode and the Washoe District, with atlas, by George F. Becker. 
1882. 4°. xv,422 pp. 7pl. and atlas of 21 sheets folio, Price $11.00. 
1V. Comstock Mining and Miners, by Eliot Lord. 1883. 4°. xiv, 451 pp. 3 pl. Price $1.50. 
V. The Copper-Bearing Rocks of Lake Superior, by Roland Duer Irving. 1883. 4°. xvi, 464 
pp. 151. 29pl. and maps. Price $1.85. : 
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. 24 pl. 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. lmap. 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. 
XI. 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 $8.40. 
XIII. Geology of the Quicksilver Deposits of the Pacifie 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. 
XVII. The Flora of the Dakota Group, a posthumous work, by Leo Lesquereux. Edited by F. 
H. Knowlton. 1891. 4°. 400 pp. 66 pl. Price $1.10. 
XVIII. Gasteropoda and Cephalopoda of the Raritan Clays and Greensand Marls of New Jersey, 
by Robert P. Whitfield. 1891. 4°. 402 pp. 50 pl. Price $1.00. 
XIX. The Penokee Iron-Bearing Series of Northern Wisconsin and Michigan, by Roland D. 
Irving and C. R. Van Hise. 1892. 4°. xix, 534 pp. Price $1.70. 
XX. Geology of the Eureka District, Nevada, with an atlas, by Arnold Hague. 1892. 4°. xvii, 
419 pp. Spl. Price $5.25. 
XXI. The Tertiary Rhynchophorous Coleoptera of the United States, by Samuel Hubbard Seud- 
der. 1893. 4°. xi, 206pp. 12 pl. Price 90 cents. 
XXII. A Manual of Topographic Methods, by Henry Gannett, chief topographer, 1893, 4°. 
xrv, 300 pp. 18 pl. Price $1.00, 
XXIII. Geology of the Green Mountains in Massachusetts, by Raphael Pumpelly, T. Nelson Dale, 
and J. E. Wolff. 1894. 4°. xiv, 206 pp. 23 pl. Price $1.30. 
XXIV. Mollusea and Crustacea of the Miocene Formations of New Jersey, by Robert Parr Whit- 
field. 1894. 4°. 193 pp. 24 pl. Price 90 cents. 
In preparation : 
—Sauropoda, by O. C. Marsh. 
—Stegosauria, by O. C. Marsh. 
—Brontotheride, by O. C. Marsh. 
—Report on the Denver Coal Basin, by 8. F. Emmons. 
—Report on Silver Cliff and Ten-Mile Mining Districts, Colorado, by S. F. Emmons. 
—The Glacial Lake Agassiz, by Warren Upham. 
BULLETINS. 
1. On Hypersthene-Andesite and on Triclinie 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., 
computed by Albert Williams, jr. 1883. 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 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. 
