20 PUBLICATIONS OF 



41. Leidy. — Memoir upon the Extinct Species of Fossil Ox. 

 By Joseph Leidy, M. D. December, 1852. 4to. pp. 20, and 5 

 plates. (S. C. v.) Price 25 cents. 



58. Leidy. — The Ancient Fauna of Nebraska ; or, a Descrip- 

 tion of Remains of Extinct Mammalia and Chelonia from the 

 Mauvaises Terres of Nebraska. By Joseph Leidy, M. D. June, 

 1853. 4to. pp. 124, and 25 plates. (S..C. VI.) Price $2. 



72. Leidy. — A Memoir on the Extinct Sloth Tribe of North 

 America. By Joseph Leidy, M. D., Professor of Anatomy in the 

 University of Pennsylvania, and Curator of the Academy of Na- 

 tural Sciences of Philadelphia. June, 1855. 4to. pp. 10, aud 16 

 plates. (S. C. vn.) Price $2. 



GEOLOGY AND PHYSICAL GEOGRAPHY. 



90. Hitchcock. — Illustrations of Surface Geology. By Ed- 

 ward Hitchcock, LL.D., Professor of Geology and Natural Theo- 

 logy in Amherst College. April, 1857. 4to. pp. 164, and 12 

 plates. (S. C. ix.) Price $4. 



13. Ellet. — Contributions to the Physical Geography of the 

 United States. Part I. — On the Physical Geography of the Mis- 

 sissippi Yalley, with suggestions for the improvement of the Navi- 

 gation of the Ohio and other rivers. By Charles Ellet, Jr., Civil 

 Engineer. 1850. 4to. pp. 64, and 1 plate. (S. C. n.) Price 

 25 cents. 



MINERALOGY. 



156. Egleston. — Check List of Minerals, with their Symbols. 

 Prepared for the Smithsonian Institution by T. Egleston, Jr. 8vo. 

 (In press.) 



BIBLIOGRAPHY. 



73. List of Publications of Learned Societies, and Periodicals 

 in the Library of the Smithsonian Institution, December 31, 1854. 

 Part I. — Europe, excepting England, France, Spain, Portugal, 

 and Italy. 1855. 4to. pp. 40. (S. C. vn.) .Price 25 cents. 



85. List of Publications of Learned Societies, and Periodicals 



