CONTENTS OF APPENDIX. 



ARTICLE I. Report of Mr. T. A. CONRAD on the fossil shells collected in California by 

 W. P. BLAKE, geologist of the expedition, under the command of Lieutenant R. S. 

 WILLIAMSON, United States Topographical Engineers, 1853 Page 5 



ARTICLE II. Catalogue of shells collected in California by W. P. BLAKE, with descrip- 

 tions of the new species. By AUG. A. GOULD, M. D Page 22 



ARTICLE III. Notes upon silicified plants found fossil in California. By W. P. BLAKE, 

 with a letter from Professor J. W. Bailey Page 28 



ARTICLE IV. Notice of the fossil fishes found in California by WM. P. BLAKE, geologist 

 of the United States Pacific railroad survey, under the command of Lieutenant R. S. 

 WILLIAMSON, United States Topographical Engineers. By Louis AGASSIZ Page 30 





