no. 1617. NEW CRETACEOUS AND TERTIARY FOSSILS—ARNOLD. 355 
GASTEROPODA. 
Nassa mendica Gould. 
Nassa perpinguis Hinds. 
Olivella biplicata Sowerby. 
Olivella intorta Carpenter. 
Olivella pedroana Conrad. 
Thais ostrina Gould. 
Thais trancosana, new species. 
Astyris richthofeni Gabb. 
Chrysodomus stantoni, new species. 
Crepidula princeps Conrad. 
Littorina, species. 
Lunatia lewisti Gould. 
Margarita pupilla Gould. 
Nassa californiana Conrad. 
Fresh-water Pliocene-Pleistocene.—During at least a portion of the 
time that the gravels, sands, and finer sediments of the Merced were 
keing deposited in the ocean, somewhat similar sediments were being 
laid down in great fresh-water lakes on the opposite side of the 
Coast Range. These fresh-water deposits are now exposed in a nar- 
row band which extends from the region of the Crystal Springs Lakes 
along the eastern side of a main ridge bordering the Santa Clara 
Valley on the west. Fresh-water fossils have been found within this 
formation at several points. Among these are the following: 
List of Fresh-water Pliocene-Pleistocene fossils from the Santa Cruz quadrangle. 
Anodonta wahlametensis Lea. 
Amnicola, species, a. 
Amnicola, species, 0. 
Paludestrina, species, a. 
Paludestrina, species, 0. 
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QUATERNARY. 
The Quaternary in the Santa Cruz quadrangle was a period of 
intermittent uplift and depression. The record of the changes that 
have taken place during it are found in the wave-cut and stream 
terraces and the marine and fresh-water deposits which occur in 
different parts of the quadrangle. With the exception of some mam- 
mal bones found in the stream gravels on the Santa Clara side of the 
main range, the most important fossiliferous deposits are on the 
raised terraces along the coast. Two localities have yielded a con- 
siderable fauna, these being the raised terraces at Ano Nuevo Point 
and near the light-house at Santa Cruz. The following fossils have 
been found in the Pleistocene deposits above mentioned: 
List of Pleistocene fossils from the Santa Cruz Quadrangle. 
PELECYPODA. 
Macoma nasuta Conrad. 
Pecten (Hinnites) giganteus Gray. 
Pholadidea penita Conrad. 
Rupellaria lamellifera Conrad. 
Saxidomus gracilis Gould. 
Zirphea gabbi Tryon. 
GASTEROPODA. 
Amphissa corrugata Reeve. 
Astyris gausapata Gould. 
Bela fidicula Gould. 
Bittium filoswm Gould. 
Bittium rugatum Conrad. 
Calliostoma costatum Martyn. 
Columbella, species, a. 
Fusus luteopictus Dall. 
Isapis, species, a. 
Mangilia, species, a. 
