REPORT OF THE SECRETARY 13 



fields), petrography and paleontology of the Canal Zone, and of as 

 much of the adjacent areas of the Isthmian region as is feasible. 



Upon the completion of the work the Institution will print a gen- 

 eral account of the results, and later there will be published a de- 

 tailed report of the geological data of the Isthmus and adjoining 

 regions. 



VERTEBRATE FOSSIL REMAINS IN MONTANA. 



During the summer of 1913 Mr. Charles W. Gilmore, of the 

 National Museum, headed an expedition for the purpose of obtain- 

 ing a representative collection from northwestern Montana. 



A camp was established on Milk River, on the Blackfeet Indian 

 Reservation, and four weeks were spent there in collecting, the work 

 being confined entirely to the Upper Cretaceous (Belly River beds) 

 as exposed in the bad lands for 10 miles along this stream. The camp 

 was then moved some 50 miles south on the Two Medicine River, and 

 two weeks were spent working in the same geological formation. 

 Between 500 and 600 separate fossil bones were obtained, many of 

 them of large size. The most notable discovery was a new Cera- 

 topsian or horned dinosaur, the smallest of its kind known. There 

 were portions of five individuals of this animal recovered, represent- 

 ing nearly all parts of the skeleton, making it possible to mount a 

 composite skeleton for exhibition. Although Ceratopsian fossils 

 were first discovered in the Rocky Mountain region in 1855, and por- 

 tions of a hundred or more skeletons have been collected, this is the 

 first individual to be found having a complete articulated tail and 

 hind foot. It thus contributes greatly to our knowledge of the 

 skeletal anatomy of this interesting group of extinct reptiles. 



Another find was a partial skeleton of one of the Trachodont or 

 duck-billed dinosaurs recently described from specimens obtained 

 in Canada, and its discovery in Montana greatly extends its known 

 geographical and geological range. Less perfect skeletons of car- 

 nivorous and armored dinosaurs, turtles, crocodiles, and ganoid 

 fishes were also obtained. 



FOSSIL ECHINODERMS IN ILLINOIS. 



The special field explorations maintained by Mr. Frank Springer, 

 associate in paleontology in the United States National Museum, 

 were continued during the season of 1913 by his private collector, 

 Frederick Braun. The purpose of these explorations is to obtain 

 additional material for use in Mr. Springer's monographs upon the 

 fossil crinoidea, now in course of preparation, but they also result 

 in important accessions of excellent specimens for the completion 

 of the exhibition series in the halls of Invertebrate Paleontology in 

 the National Museum. 



69602°— SM 1914 2 ' 



