ADVERTISEMENT. 
IX. Brackiopoda and Lamellibranchiata of the Raritan Clays aud Greensand Marls of New Jersey, 
by Robert P. Whitfield. 1885. 4°. xx, 338 pp. 35 pi. Price $1.15. 
X. Dinocerata. A Monograph of an Extinct Order of Gigantic Mammals, by Othniel Charles Marsh- 
1885. 4°. xviii, 243 pp. 561. 56 pi. Price $2.70. 
XL Geological History of Lake Lahontan, a Quaternary Lake of Northwestern Nevada, by Israel 
Cook Riresell. 1885. 4°. xiv, 288 pp. 46 pi. Price $1.75. 
XII. Geology and Mining Industry of Leadville, with atlas, by S. F. Emmons. 1886. 4°. xxix, 
770 pp. 45 pi. and atlas of 35 sheets folio. Price $8.40. 
The following are in press : 
XIII. Geology of the Quicksilver Deposits of the Pacific Slope, with atlas, by George F. Becker. 
XIV. The Fossil Fishes and Fossil Plants of the Triassic Rocks of New Jersey and the Connecticut 
Valley, by J. S. Newberry. 
The following are in preparation: 
I. The Precious Metals, by Clarence King. 
XV. Paleozoic Fishes of North America, by J. S. Newberry. 
XVI. Younger Mesozoic Flora of Virginia, by William M. Fontaine. 
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 Prof. O. C. Marsh. 
— Stegosauria, by Prof. O. C. Marsh. 
— Brontotheridae, by Prof. O. C. Marsh. 
— The Penokee-Gogebic Iron-Bearing Series of !Nortli Wisconsin and Michigan, by Roland D Irving. 
— Report on the Denver Coal B?sin, by S. F. Emmons. 
— Report on Silver Cliff and Ten-Mile Mining District, 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. 
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. 
Of this series of Bulletins Nos. 1 to 47 are already published, viz: 
1. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, with a 
Geological Sketch of Buffalo Peaks, Colorado, by S.F.Emmons. 1883. 8°. 42 pp. 2 pi. Price 10 cents. 
2. Gold and Silver Conversion Tables, giving the coining values of troy ounces of fine metal, etc., 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, 
New York, to Bradford County, Pennsylvania, by Henry S.Williams. 1884. 8°. 36i>p. Price 5 cents. 
4. On Mesozoic Fossils, by Charles A. White. 1884. 8°. 36 pp. 9 pi. 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, by Jules Marcou and John Belknap Marcou. 1884. 8°. 184 pp. Price 10 cents. 
8. On Secondary Enlargements of Miueral Fragments in Certain Rocks, by R. D. Irving and C. R. 
Van Hise. 1884. 8°. 56 pp. 6 pi. Price 10 cents. 
9. Report of work done in the Washington Laboratory during the fiscal year 1883-'84. F. W. Clarke, 
chief chemist; T. M. Chatard, assistant. 1884. 8°. 40 pp. Price 5 ce] us. 
10. On the Cambrian Faunas of North America. Preliminary studies, by Charles D. Walcott. 1884. 
8°. 74 pp. 10 pi. 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. 6 pi. Price 5 cents. 
12. A Crystallographic Study of the Thinolite of Lake Lahontan, by Edward S. Dana. 1884. 8°. 
34 pp. 3 pi. Price 5 cents. 
13. Boundaries of the United States and of the several States and Territories, by Henry Gannett. 
1885. 8°. 135 pp. Price 10 cents. 
14. The Electrical and Magnetic Properties of the Iron-Carburets, by Oarl Barus and A T incent 
Strouhal. 1885. 8°. 238 pp. Price 15 cents. 
15. Oh the Mesozoic and Cenozoic Paleontology of California, by Charles A. White. 1885. 8°. 
33 pp. Price 5 cents. 
