II ADVERTISEMENT. 
V. The Copper-Bearing Rocks of Lake Superior, by Roland Duer Irving. 1883. 4°. xvi, 464 pp. 
15]. 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 Waleott. 1884. 49°. 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. 35pl. 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. 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 $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 8. 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. 6€ pl. Price $1.10. 
XVIII. Gasteropoda and Cephalopeda of the Raritan Clays and Greensand Marls of New Jersey, 
by Robert P. Whitfield. 1891. 4°. 402 pp. 50 pl. Price $1.00. 
In press: 
XIX. The Penokee Iron-Bearing Series of Northern Wisconsin and Michigan, by Roland D, 
Irving and C. R. Van Hise. 
XX. Geology of the Eureka District, Nevada, by Arnold Hague. 
XXI, The Tertiary Rhynchophorous Coleoptera of North America, by 8. H. Sendder. 
XXII. Geology of the Green Mountains in Massachusetts, by Messrs. Pumpelly, Wolff, and Dale. 
In preparation : 
—Mollusea and Crustacea of the Miocene Formations of New Jersey, by R. P. Whitfield. 
—Sauropoda, by O. C. Marsh. 
—Stegosauria, by O. C. Marsh. 
—Brontotheridx, by O. C. Marsh. 
—Report on the Denver Coal Basin, by S$. F. Emmons. 
—Report on Silver Cliff and Ten-Mile Mining Districts, Colorado, by 8. F. Emmons. 
—The Glacial Lake Agassiz, by Warren Upham. 
BULLETINS. 
1. On Hypersthene-Andesite and on Triclinie Pyroxene in Augitic 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°. 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 8. 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 Marcou 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 1883~84. 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. 10pi. 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. 
