230 REPORT ON NATIONAL MUSEUM, 1886. 



The arrangement in cases has been made as follows : All collections 

 whose entirety had not been broken, or the specimens identified and 

 labelled, were transferred to the north balcony of the Smithsonian Build- 

 ing and there arranged according to locality. To the collections of the 

 U. S. Geological Survey a green tag was glued upon each specimen, 

 bearing the accession number of the Survey. All the collections were 

 arranged in cases geographically and a card index made, by which 

 every collection can be readily referred to. 



The second class of collections embraced all specimens that had been 

 identified and duly recorded on the Museum register and labelled in the 

 proper manner. The temporary arrangement of this material in the 

 southeast court of the Museum has been completed. 



The present provisional arrangement is purely strati graphical; only 

 a broad biological classification having been attempted under each geo- 

 logical period. 



The many valuable type specimens belonging to the collection have 

 been arranged separately from the stratigraphical arrangement above 

 mentioned, so that they can be conveniently studied as a whole. These 

 have been collected together and reidentified by Mr. Marcou, who has 

 published a catalogue of the same in the proceedings of the Museum.* 



During the year, 15G3 entries were made in the Museum catalogue. 



No estimate has been made of the total number of specimens in the 

 Museum collections, nor any attempt to group them into different cate- 

 gories. 



* Vol. vni, pp. 290-.U4. 



