66 REPORT OP NATIONAL MUSEUM, 1915. 



trilobites. To the vertebrate series were added a mounted skeleton 

 of the horned rodent, Epigaulus hatcheri; a fossil peccary from the 

 Cimiberland, Md., cave deposit; a large Pleistocene dog from the 

 La Brea asphalt deposits of California; a skull of Triceratops 

 obtusus and one of Brachycerato'ps tnontanensis ; an entire case de- 

 voted to ceratopsian remains, among which is a partial skull sec- 

 tioned longitudinally through the center to show the small size of 

 the brain cavity ; and the types of Stylemys nebrascensis and Rutio- 

 don carolinensis. 



Explorations. — As in previous years the principal field work car- 

 ried on had reference to paleontological investigations. Secretary 

 Charles D. Walcott conducted operations during the summer of 1914 

 at Glacier, British Columbia, and in the region of the Big Elk 

 Mountains of Montana; and in the spring of 1915 he passed a few 

 days examining a newly discovered locality for fossil algal material 

 in Maryland. Mr. Frank Springer's private collector spent four 

 months in collecting fossil echinoderms along the recent excavations 

 of the Erie Canal and at other localities in western New York, and 

 Dr. R. S. Bassler gave two weeks to a study of the Middle Paleozoic 

 rocks of Tennessee, Kentucky, and Ohio. Mr. James W. Gidley 

 completed his field work in connection with the Cumberland, Md., 

 cave deposit, and Mr. Charles W. Gilmore was detailed for three 

 weeks to accompany a Geological Survey party into the region of 

 the Judith River formation along the Missouri River in central 

 Montana. In June, Mr. Gidley began the exhuming of certain 

 mastodon remains near Winamac, Ind., but this work had not been 

 completed at the close of the year. 



The head curator. Dr. Merrill, and Dr. Wherry were each in the 

 field for a few weeks but not under the auspices of the Museum. 

 It is interesting to note that arrangements have been made with 

 Dr. W. T. Schaller, of the Geological Survey, who is engaged in 

 a study of the gem-bearing pegmatites of Mesa Grande, Cal., whereby 

 it is expected that the Museum will secure for exhibition purposes 

 a type series of these rocks and their associated minerals. A like 

 arrangement was entered into with Dr. J. E. Pogue, formerly assist- 

 ant curator of minerals, who left for the field at the very end of the 

 year, to obtain a similar collection from the emerald-bearing peg- 

 matites of Colombia, South America. The Koren expedition into 

 northeastern Siberia, through the instrumentality of which it is 

 hoped to obtain important mammalian remains, has not yet returned 

 and no report of progress has been received. 



In this connection, mention may be made of the services of Mr. 

 Victor C. Heikes and Mr. Frank L. Hess, both of the Geological 

 Survey, through whose interest in the Museum, while in the field, a 



