60 REPORT OF NATIONAL MUSEUM, 1912. 



occupyins: in the aggregate several cases, some of large size. Many 

 fine specimens of crinoids from the collection of Mr. Frank Springer 

 were arranged in two large upright cases, with special reference to 

 illustrating the faunas of the lower Carboniferous rocks of the 

 Mississijopi Valley. The Harris collection was remounted and in- 

 stalled at the eastern end of the hall. 



With respect to the reserve collections and the unworked material, 

 it may be said that the extensive collection of Cambrian fossils ob- 

 tained by Secretary Walcott in 1911 was prepared for study, and 

 some 75 drawers of Ordovician fossils were put in final shape for 

 reference. The Springer collection of fossil echinoderms, filling two 

 cars, which arrived during the year, was unpacked and arranged in 

 cases by the curator of the division, aided by several assistants. This 

 work required about three months' time, and the collection quite fully 

 occupies the large double laboratory which has been allotted for its 

 storage and study. Seventy-one boxes of unclassified material were 

 withdrawn from storage, where they had been for some time, and the 

 specimens were prepared and placed in the study series. The large 

 collection of early Paleozoic bryozoa from Russia and Sweden, on 

 which Museum Bulletin No. 77 was based, was conveniently ar- 

 ranged. The Tertiary collections were gone over and cleaned, the 

 drawers in the upright cases containing them were labeled, and the 

 material made readily accessible. A large number of Tertiarj^ fossils 

 from the coastal plain region were also labeled. 



In the section of vertebrate paleontology the work related mainly 

 to the preparation of specimens for exhibition, which, so far as they 

 were completed, are referred to in another connection. Mr. Gilmore, 

 with the assistance .of the preparators, spent a large part of the year 

 in assembling and preparing the Stegosavrus material contained in 

 the Marsh collection. This work can not be finished for some time, 

 but is expected to result in two exceptionally fine mounts of this 

 remarka))le reptile. Of the unworked material in the section, filling- 

 several hundred boxes and trays, a very large number of mammalian 

 and reptilian bones were freed from the matrix and listed and num- 

 bered. 



The entire exhibit of paleobotany, the last of the paleontological 

 series, was removed from the older to the new building early in the 

 year, and its reinstallation in the north aisle of the east wing was 

 proceeded with as rapidly as possible. The collection was over- 

 hauled, cleaned, and remounted, and the increased space allotted to 

 the subject made it possible to introduce many valuable specimens 

 which had been in storage. Among the conspicuous additions were 

 a number of sections of silicified logs, a Devonian fossil tree, and 

 several large and showy Carboniferous plants. The material forming 

 the basis of Dr. Arthur Hollick's study of the Cretaceous flora of 



