Appendix: I. Notice of the fossil fishes by L. Agassiz.
II. Description of the fossil shells. by T. A. Conrad.
III. Catalogue of the recent shells, with descriptions of the new species, by A. A. Gould.
IV. Letter from J. W. Bailey, describing the structure of the fossil plant, from Pasuncula River.
V. Description of the structure of the fossil wood from the Colorado desert, by G. C. Schaeffer.
VI. Chemical examinations of the soils and incrustations, by J. D. Easter.
VII. Description of plants collected by W. P. Blake along the route and at the mouth of the Gila, by J. Torrey.
VIII. Descriptions of fossil microscopic organisms, from Monterey, by J. W. Bailey.