DESCRIPTIONS OF NEW CRETACEOUS AND TERTIARY 
FOSSILS FROM THE SANTA CRUZ MOUNTAINS, CALI- 
FORNIA. 
By Rateu ARNOLD, 
Paleontologist, U. S. Geological Survey. 
INTRODUCTION. 
During the past seventeen years the professors and students in the 
geologic department of Leland Stanford Junior University have 
brought together from the Santa Cruz Mountains and adjacent 
regions a large lot of paleontological material which is now the prop- 
erty of the university. In addition to this the writer has made ex- 
tensive collections in the same region for the United States Geolog- 
ical Survey. AIl of this material is now being worked over by the 
writer for a monograph on the paleontology of the Santa Cruz quad- 
rangle, within the boundaries of which the greater part of the Santa 
Cruz Range hes. The Santa Cruz folio, embracing maps, geologic 
sections, a plate of the characteristic or common fossils of the region, 
and text devoted to a description of the geology of the quadrangle, is 
now ready for the press. Many of the species of fossils figured on 
the folio plate are new, and in order to avoid the confusion in nomen- 
clature which might arise should this folio (which is written jointly 
by J. C. Branner, J. F. Newsom, and Ralph Arnold) be published 
before the appearance of the monograph describing the fossils, it has 
been deemed expedient to prepare the present preliminary paper 
describing those of the new species which are figured in the folio. 
A list of some of the previously described species associated with the 
new forms will be included in this report, together with a brief de- 
scription of the various formations from which the fossils have been 
obtained, to make clearer the relations of the faunas involved. <A few 
of the old species will also be figured for the same reason. 
The writer wishes to acknowledge his indebtedness to Dr. William 
H. Dall, Dr. T. W. Stanton, Dr. James Perrin Smith, Dr. John C. 
~ Merriam, and Dr. Hubert Lyman Clark for assistance in determining 
the genera and zoologic relations of some of the new forms, and to 
PROCEEDINGS U. S. NATIONAL Museum, VOL. XXXIV—No. 1617. 
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