Ftiblications of the United States Government. 33 



Inezensis; TurriteUa Inezana; T. variata; Natica Inezana; Tapes 

 Tnezensis. 



From San Buenaventura : Tapes montana. 



From Pajaro River : Venxis Pajaroana. 



From Sierra Monica : Ci/clas perinacra ; Ostrea subjecta. 



From San Luis Obispo Valley : Area Obispoana. 



From GaviotaPass: Ostrea panzano ; Mactraf Gaviotensis ; Trochita 

 costellata. 



From Salinas River, Monterey County: Dosinia alta; D.longula; 

 D Montana; D. subobliqua. 



From Ranch Triumpho, Los Angeles: Lutraria transmontana ; 

 Axinea Barbarensis. 



Report of Mr. T. A. Conrad on the fossil shells collected in 

 California by Wm. P. Blake, Geologist of the Expedi- 

 tion under the command of Lieut. R. S. Williamson, etc. 

 Washington, 1855. 34 pp. (House Doc. 129.) 



The fossils described in this report were afterward republished, 

 with figures, in the fifth volume of Explorations and Surveys for a 

 Railroad Route from the Mississippi River to the Pacific Ocean. 



REPORTS ON MINERAL RESOURCES OF THE 



STATES AND TERRITORIES WEST 



OF THE MISSISSIPPI. 



Report of 1867; by J. Ross Browne and James W. Taylor, U. S. 

 Mining Commissioners. Washington, 1867. 360 pp. 



Historical sketch of gold and silver mining on the Pacific Slope ; 

 by J. Ross Browne and J. W. Taylor, pp. 13-36. 



Geological formation, etc., of Pacific Slope ; by William Ashbumer. 

 pp. 37-49. (Contains articles on the gold-mining interest of Califor- 

 nia ; characteristics of the gold belt ; northern mining district ; 

 mining in the Sierras.) 



Condition of gold and silver mining on the Pacific Coast ; by J. Ross 

 Browne and James W. Taylor, pp. 49-85. 



The copper resources of the Pacific Slope ; geological formation in 

 which copper is found ; by J. Ross Browne and James W. Taylor. 

 Section V, pp. 138-169. 



Quicksilver mines in California; New Almaden mines, products 

 and exports. Section VI, pp. 170-178. (This article contains a de- 

 scription of the New Almaden mines, with extracts of a report by 

 Prof. B. Silliman, Jr., from the Am. Jour. Sci. for September, 1864.) 



Borax, sulphur, tin, and coal. Section VII, pp. 178-193. (Contains 

 articles on the discovery of borax in California, etc.; reports on tin, 

 from the Geological Survey of California, Vol. 1, p. 180 ; with report on 



