114 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1933 



Dr. W. F. Foshag, assisted by James Benn, selected material for an 

 exhibit illustrating the fluorescence of minerals under ultraviolet 

 light. Since only an occasional specimen shows a satisfactory degree 

 of fluorescence, it was necessary to examine hundreds of samples 

 before the best possible effect could be achieved. A satisfactory 

 lighting system was devised by L. B. Clark, of the Division of 

 Radiation and Organisms. 



The head curator completed the preparation and installation of the 

 biologic series of fossil plants, a case illustrating the geology of a 

 coral island, one showing various types of geological structures, 

 another with imitative forms of fossils, and one each of the peculiar 

 extinct merostome crustaceans and unusual cephalopods. He like- 

 wise installed on a single exhibition base large, showy examples of 

 various kinds of conglomerates and glacial boulder clays. 



Dr. C. E. Resser, with the help of Dr. Josiah Bridge, assembled an 

 exhibit illustrating the life of the Ozarkian and Canadian periods, 

 thus filling a long-existing gap. In cooperation with Dr. Roland 

 Brown and Dr. C. B. Read, of the United States Geological Survey, 

 available material also was assembled to illustrate fossilized fruits and 

 flowers. 



Dr. G. A. Cooper placed 30 lithologic samples in the stratigraphic 

 exliibition series, revised the exhibit of stromatopores, and, at the 

 close of the year, went over the entire exliibition series in preparation 

 for the International Geological Congress. Dr. C. B. Read continued 

 his voluntary rearrangement of the Lacoe plants. Dr. Charles Butts 

 arranged his extensive collections of Paleozoic fossils so that they are 

 readOy available. 



Following her retirement from the Government service at the end of 

 December 1932, Miss Margaret Moodey was appointed, under the 

 Springer fund, to take up the long-delayed work of cataloging the 

 unrivaled Springer collection of echinoderms. Two months were 

 spent in bibliographic work and 4 months in checldng and cataloging. 

 At the end of the year, 8 families of the Camerata, comprising 115 

 standard drawers, were completed. 



The exliibition series in vertebrate paleontology was increased by 

 the addition of a 5-foot skeleton of Ichthyodectes hamatus, skulls of 

 Rdmontosaurus regalis Lambe and Prosawolophus maximus Brown; 

 skull and lower jaws of Ryrachodon and a skull of Ovibos. 



Assistant Curator C. L. Gazin continued his rearrangement of the 

 mammal collection. The Cumberland Cave collection, consisting of 

 several hundred specimens, is now completely cataloged, labeled, and 

 arranged in standard trays; the Plesippus materials have been assorted 

 and, with the exception of the skulls, assembled as a single unit; 

 the Cook collection from Idaho and the Gidley collection from Florida 

 were assorted, labeled, and many of the specimens cataloged. Dr. 

 Gazin also has identified many of the Bridger specimens. 



