KXPLAXATION OF PLATE XT. 



Obsidian blades, one specialized as a knife or lance head, and the 

 other in the rou^h. The first was found in 18(>1), with other relics and 

 with mastodon remains, in auriferous gravel, 10 feet below the sur- 

 face, at Horse Shoe Bend, Merced River, Mariposa County, Cal. The 

 second was obtained in 1863, with other relics, from auriferous g-raveK 

 10 feet below the surface, near Princeton, Mariposa Countj', Cal. 

 Referred to by Whitney, p. 261. A similar specimen came from the 

 gravels in Fresno Count}', Cal, Nos, 23 and 21, Voy collection. 



These specimens present no features at variance with the ordinary 

 obsidian implements of California. Engraved actual size. 



444 



