REPORT OF NATIONAL MUSEUM, 1921. 87 
vician rocks of the Appalachian and Mississippi Valleys during the 
first three and last two months of the fiscal year. Accompanied by 
his assistant, he studied numerous areas to determine doubtful geo- 
logical points, during the course of which he obtained valuable col- 
lections which will come to the National Museum. 
Early in the year Assistant Curator J. W. Gidley was detailed to 
visit Williamsburg, Va., to investigate a reported find of some fossil 
bones in that vicinity. These proved to be the remains of an extinct 
species of whale of Miocene age, but were incomplete and too badly 
damaged to make possible the recovery of a sufficient number for an 
exhibition mount. 
Two other important field expeditions were undertaken by Mr. 
Gidley during the year, the first as the result of reports from Mr. 
Kirk Bryan, of the Geological Survey, who had discovered some 
promising localities for fossil vertebrate remains while making an 
extensive survey of the underground water resources in the San 
Pedro Valley of Arizona. Mr. Gidley spent two months or more in 
the Arizona field, visiting three localities in the San Pedro Valley 
and one in Sulphur Springs Valley. The last yielded only fragmen- 
tary remains of Pleistocene mammals, but much better results were 
obtained in the San Pedro Valley, where two localities, one about 
2 miles south of Benson, the other at the Curtis ranch, about 14 miles 
south of Benson, yielded remains of about 30 species, mostly mam- 
mals, which seem to represent a new or little-known Pliocene fauna. 
Mr. Gidley shipped 21 boxes, with an aggregate weight of about 
4,630 pounds. <A portion of this material will be suitable for ex- 
hibition, the most important being remains sufficiently complete to 
form the basis of skeleton restorations of a rare species of mastodon 
and a large edentate. Other remains represent extinct species of 
camels, carnivorous animals, rodents, turtles, and birds. 
The second expedition, entirely under Museum auspices, included 
a trip to Agate Springs, Nebr., where was secured a large slab, or 
block of limestone containing remains of the little rhinoceros Dicera- 
theriwm cooki, This will be cleaned and exhibited with the bones 
in situ. 
Mr. C. W. Gilmore was detailed in April to visit a fossiliferous 
area. some 36 miles north of Santa Fe, N. Mex., for the purpose of 
making collections of paleontological material, and for determining 
the advisability of reserving certain lands for national monument 
purposes. A skull, lower jaws, and other bones of an extinct rhi- 
noceros, various limb and foot bones of a camel, and a small collec- 
tion of miscellaneous specimens were obtained as a result of this trip. 
Work of preserving and installing the collections—Numerous 
minor changes have been made in the exhibition collections by the 
addition of new material. A special case to accommodate two large 
