+. 
62 APPENDIX. 
like a counterpart of the fragment figured by the French author, who refers it to a group of Maples, which 
includes among others A. coceinewm, Michx. 
The conclusions to be derived from the determination of these few fossil species fully coincide with what 
has been exposed by the table indicating the relation of the plants described in the report on the flora of 
the auriferous gravel deposits. The group is Miocene by one species of Acer and one of Quercus, while 
it has of each of these genera one species living at the present epoch. It has also an Acer positively 
identified. with a species of the Gypses of Aix. Its relation therefore to the Miocene flora is more dis- 
tinctly marked than to the flora of the present period. It has two Atlantic types, not present now in the 
Pacifie slope, and two exclusively Californian ones, represented now by one species of wide distribution, 
Quercus chrysolepis, and by another probably modified by local influence, an Acer, intermediate between 
Acer macrophyllum and A. grandidentatum. 
The relation to the Pliocene of Europe rests as it was formerly indicated, on the analogy, not identity 
of one species only. 
