A CKN O IVLED GMENTS. 323 



Walcott, Charles D. — Contijmed. 



—The Taconic System, i p.— Am. Jour. Sci., Vol. XXXIII, Feb., 1887. 



— Preliminary Notes on the Discovery of a Vertebrate Fauna in Silurian 

 (Ordovician) Strata. 18 pp., pi. — Bull. Geol. Soc. Am., March, 1892. 



— The Trilobite : New and Old Evidence Relating to its Organization. 33 pp., 

 6 pi. — Bull. Mus. of Comp. Zoology. 



— Appendages of the Trilobite. 3 pp., Ill.^-Science, March, 1884. 



— Notes on Some Sections of Trilobites from the Trenton Limestones, and 

 Descriptions of New Species of Fossils. 17 pp., i pi. — N. Y. State Mus. Nat. 

 Hist., March, 1879. 



— The Utica Slate and Related Formations. _ Fossils pf the Utica Slate and 

 Metamorphoses of Triarthrus Beckii. 38 pp., 2 pi. — Albany Institute, June, 1879. 



— The Permian and other Paleozoic Groups of the Kanab Valley, Arizona. 



4 pp. 



— Descriptive Notes of New Genera and Species from the Lower Cambrian or 

 Olenellus Zone of North America. 13 pp. — Proc. U. S. Nat. Mus., Vol. XII, 

 1889, 



■ — Description of New Forms of Upper Cambrian Fossils. 12 pp., 2 pi. — 

 Proc. of the U. S. Nat. Mus., Vol. XIII, 1890. 



— Notes on the Cambrian Rocks of Virginia and the Southern Appalachians. 



5 pp. — Am. Jour. Sci., July, 1892. 



— Study of a Line of Displacement in the Grand Canon of the Colorado, in 

 Northern Arizona. 15 pp.. 111. — Bull. Geol. Soc. Am., Vol. I, 1889. 



— The Value of the " Hudson River Group " in Geologic Nomenclature. 

 20 pp. — Bull. Geol. Soc. Am., Vol. I, 1890. 



— Descriptions of a New Genus and Species of Inarticulate Brachiopod from 

 the Trenton Limestone. 2 pp.. 111. — Nat. Mus. Cat., No. 18443. 



— A Review of Dr. R. W. Ells's Second Report on the Geology of a Portion 

 of the Province of Quebec; with Additional Notes on the "Quebec Group." 14 

 pp. — Am. Jour. Sci., Vol, XXXIX, Feb., 1890. 



— Descriptions of New Species of Fossils from the Calciferous Formation. 

 4 pp. — N. Y. State Mus. Nat. Hist., 1879. 



— Preliminary Notice of the Discovery of the Remains of the Natatory and 

 Branchial Appendages of Trilobites. 8 pp. 

 Ward, Lester F. 



— The Plant-Bearing Deposits of the American Trias. 8 pp. — Bull. Geol. Soc. 

 Am., Vol. IH, 1891. 



— Principles and Methods of Geologic Correlation by Means of Fossil Plants. 

 13 pp. — Am. Geol., Vol. IV, No. i, Jan., 1892. 



— Geology and Natural History. 3 pp. — Am. Jour. Sci., April, 1882. 



— Determination of Fossil Dicotyledonous Leaves. 6 pp. — Am. Jour. Sci., 

 May, 1886. 



— Evidence of the Fossil Plants as to the Age of the Potomac Formation. 12 

 pp. — Am. Jour. Sci., Aug., 1888. 



— Origin of the Plane-Trees, 13 pp.. 111. — Am. Nat., Sept., 1890. 



— Paleontologic History of the Genus Platanus. 4 pp., 6 pi. — Proc. of U. S. 

 Nat. Museum, Vol. XI, 1888. 



— The Course of Biologic Evolution. 33 pp. 1890. 



— Bulletin of the U. S. Geol. Survey, No. 37. Types of the Laramie Flora. 

 115 pp., 57 pi. 



— The Geographical Distribution of Fossil Plants. 195 pp. — Eighth Annual 

 Report U. S. G. S., 1889. 



— Synopsis of the Flora of the Laramie Group. 152 pp., 33 pi. 



— Sketch of Paleobotany. 106 pp., 2 pi. 1885. 

 Weeks, Jos. D. 



— Production of Coke. 25 pp. — Census Bulletin, July 19, 1892. 

 Weinschenk, E. 



— Beitrage zur Mineralsynthese. 18 pp. — Zeitschrift flir Krystallographie, Vol. 

 XVH. 1890. 



