REPORT OF THE SECRETARY. / 



cliffs from the westward. On the right of Mount Drysdale the east- 

 ern side of the great Washmawapta snow field may be seen; in the 

 distance, through the Pass, the dark Beaverfoot Range, and beyond 

 it, in the extreme background, the snowy peaks of the Selkirk Ranges. 

 A late September storm drove us back from Wolverine Pass to the 

 Vermilion River, where below Ochre Creek a search was made for 

 moose. On October 1 a great bull, a cow, and young were brought 

 down and their skins, skulls, and horns secured for the National 

 Museum collections. 



RESEARCHES ON THE STRUCTURE OF THE TRILOB1TES. 



In my laboratory work for the past 45 years I have been on the 

 watch for evidence bearing on the structure and organization of 

 fossil trilobites. The study of a small and unique series of speci- 

 mens secured at Burgess Pass since 1910 has so greatly increased 

 our knowledge of these interesting animals that a special paper, ac- 

 companied by 28 plates of illustrations, is now in press, to appear in 

 the Smithsonian Miscellaneous Collections. 



GEOLOGICAL WORK IN THE APPALACHIAN AND OHIO VALLEYS. 



During the summers of 1916 and 1917 Mr. Frank Springer con- 

 tinued his researches upon the fossil echinoderms of the Ohio Valley 

 with a view to obtaining further material and information for the 

 completion of a monograph upon the Silurian crinoids of that area 

 which he has now in preparation. His assistant, Dr. Herrick E. 

 Wilson, collected in the vicinity of St. Paul and of Madison, in 

 Indiana, proving for the first time the presence in the latter locality 

 of the crinoidal faunas of both the Waldron and the Laurel forma- 

 tions. One object of the present field investigation is to obtain 

 further light on the relations of the Silurian faunas of the Chicago 

 and southern Indiana areas with those of western Tennessee. Mr. 

 Springer acquired by purchase all the echinoderms in the large col- 

 lection of Mr. John F. Hammell, of Madison, Ind., which included 

 that made by A. C. Benedict from the Indiana Silurian, containing 

 the types of a considerable number of species. This material has 

 been added to his collection of fossil echinoderms now deposited in 

 the National Museum. 



GEOLOGICAL W T ORK IN MARYLAND. 



Dr. Bassler, of the division of invertebrate paleontology in the 

 National Museum, reports that, in company with Assistant Curator 

 Dr. C. E. Resser, he made some investigations in the Frederick and 

 Hagerstown valleys of Maryland with the object of securing for the 

 exhibition series large examples illustrating the various types of 

 conglomerate. Two fine, large masses of the well-known Triassic 



