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

 1855. 4to. pp. 70, and Itj phvtes. (S. C. vii.) $3. 



192. Leidy, J.— Cretaceous Reptiles of the United States. 18(55. 4to. 

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172. Meek, F. B. and F. V. Haydeii.— Palrpontcilogy of the Upper Mis- 

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177. Meek, F. B.— Check List of the Invertebrate Fossils of North Ame- 

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183. Meek. P. B.— Check List, etc. Miocene. 18U4. 8vo. pp. 36. 25 



cents. 



200. Conrad, T. A.— Check List, etc. Eocene and Oligocene. 1866. 8vo. 



pp. 46. 25 cents. 



GEOLOGY AND PHYSICAL GEOGHAPHY. 



90. Hitchcock, E.— Illustrations of Surface Geology. 1857. 4to. pp. 

 166, and 12 plates. (S. C. ix.) $4. 



13. Ellet, C— Contributions to the Physical Geography of the United 

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197. Whittlesey, C— Fresh Water Drift of the North Western States. 



4to. (In press.) ,. ^, . a 



202. Pumpelly, R.— Geological Observations m Mongolia, China, and 



Japan. 4to. (In press.) 



MINERALOGY. 



156. Egleston, T.-Catalogue of Minerals with their formulas. IS-JS. 

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117 Cataloc'ue of Publications of Societies, and of other periodical Works 

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179. Catalogue, etc., 2d edition. January, 1866. 8vo. pp. 600. (In press. 



74 Catalogue of Publications of the Smithsonian Institution. Corrected 

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203. List of works published by the Smithsonian Institution, January, 

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