REPORT OF NATIONAL MUSEUM, 1925 77 



erals and ores, all on an exchange basis. Particular mention should 

 be made of two fine polished slabs of silver ore showing native silver, 

 and one of rammelsbergite and silver of exceptional size and purity, 

 included in the last-named lot. 



Transfers from the United States Geological Survey included 

 type specimens described and illustrated in publications of that 

 organization and a large amount of miscellaneous material collected 

 chiefly by Dr. W. T. Schaller. 



Four minerals new to the collection were acquired by purchase. 



Miss Moodey reports the following additions to the collection of 

 gems under her charge. These are chiefly credited to the Chamber- 

 lain Fund, and comprise an unusually perfect star sapphire, weigh- 

 ing 33.77 carats; a chrj^soberyl, weigliing 46.32 carats; three large 

 cut stones of Australian opal of varieties of coloring previously un- 

 represented ; a carved pendant of lapis-lazuli ; two peridots of large 

 size and beautiful color; a string of turquoise beads made by the 

 Navajo Indians; and a string of agate beads. Individual gifts to 

 the collection are a pale yellow sapphire presented by W. H. Wright, 

 Washington, D. C, and pins of coral, mosaic, and inlay, donated 

 by Mrs. Charles D. Walcott. A. E. Heighway, Alexandria, Va., 

 loaned a number of rough and cut sapphires. 



Additions to the petrological collections consisted chiefly of rocks 

 which were relegated to the duplicates. 



Approximately 40,000 specimens of invertebrate fossils, repre- 

 senting the results of Secretary Walcott's field work for the seasons 

 1921 to 1924, inclusive, constitute the most valuable accession to the 

 division of stratigraphic paleontology. These illustrate particu- 

 larly the stratigraphy of the Cambrian and Ozarkian formations of 

 the northern Rocky Mountain region, and are admirably supple- 

 mented by collections made under a grant from the National Acad- 

 emy of Sciences by Associate Curator Resser in the more southern 

 regions. Of especial importance in the latter is the most complete 

 example of a Cambrian crinoid thus far discovered. 



Next in importance is a collection of Upper Cambrian fossils from 

 Wisconsin obtained by Dr. E. O. Ulrich for the purpose of solving 

 certain questions in the Cambrian stratigraphy of the northern 

 States. 



Curator R. S. Bassler during his vacation was engaged in a study 

 of the Upper Paleozoic rocks of Kentucky and Tennessee. About 

 1,000 specimens of crinoids and other Mississippian fossils from 

 northern Tennessee were collected during the course of this work. 

 Collections made by Erwin R. Pohl, aid in paleobotany, in eastern 

 New York enriched the stratigraphic series of Ordovician fossils. 



Among the gifts deserving of special mention is a collection of 

 more than 5,000 specimens of Cretaceous and Tertiary invertebrates 



