REPORT OP THE SECRETARY. 9 



that region. The annnals represented include the mammoth, bison, 

 caraboii, horse (two or more species) , rhinoceros, musk-ox, wolverine, 

 and wolf. The prize specimen is a finely preserved, almost complete 

 skull of Elephas primigeniue. It is of especial interest as being the 

 only skull of the Siberian mammoth in any of our American 

 museums. 



COLLECTING FOSSIL ECHINODERMS IN THE OHIO VALLEY. 



Explorations for fossil echinoclerms were conducted during the 

 summer of 1915, under the supervision of Mr. Frank Springer, asso- 

 ciate in paleontology in the United States National Museum. The 

 work was limited to two areas of Silurian rocks in the Ohio Valley 

 from each of which much valuable material was procured for the 

 study of certain definite problems. In southern Indiana Mr. Her- 

 rick E. Wilson, under Mr. Springer's direction, spent a number of 

 weeks quarrying for Niagaran echinoderms, particularlj^ crinoids, in 

 the vicinity of St. Paul where numerous outcrops of the Laurel lime- 

 stone occur. The object of this work was to secure as many speci- 

 mens as possible for comparisons of this peculiar fauna with those 

 from European Silurian rocks. Not only was much material ob- 

 tained by the quarrying operations, but all of the local collections of 

 fossils were purchased for Mr. Springer, so that the Museum, which 

 hitherto had practically no fossils from the Laurel limestone, is now 

 in possession of a splendid general collection of fossils from this 

 particular formation. 



The second area of exploration was in west Tennessee along the 

 Tennessee Eiver, where Mr. W. F. Pate spent some weeks in search- 

 ing for the peculiar crinoidal bulb, Camarocrinus, and the associ- 

 ated crinoid, Scyphocrinus, both of which Mr. Springer has proved 

 to belong to the same organism. Mr. Pate was successful in finding 

 several localities where excellent specimens of the Camarocrinus and 

 Scyphocrinus were associated. Much material was secured and the 

 specimens will be used in the preparation of Mr. Springer's mono- 

 graph upon this group of crinoids. 



GEOLOGICAL WORK IN PENNSYLVANIA AND VIRGINIA. 



By arrangement with the United States Geological Survey, Dr. 

 Edgar T. Wherry, of the National Museum, continued his studies 

 of the geology of the Reading quadrangle in eastern Pennsylvania 

 for a month during the summer of 1915. He completed the areal 

 mapping of the Cambrian and Ordovician rocks of the region, and 

 has transmitted to the Survey the manuscript of a report upon 

 his work. He also mapped Cambrian and Triassic formations on 



