Oct. 1899. Annual Report of the Director. 369 



very dark in color, when a tray with white interior was used. For 

 several collections exhibited in upright floor cases in Hall 35, a 

 mount of manila board, three-sixteenths of an inch in thickness, 

 covered with paper of the Museum standard color, with a black ground 

 for the specimen and a ruled space for the label, has been employed. 

 Warping of the mount is guarded against so far as possible by putting 

 cloth between the several layers of board used in its construction. 

 In spite of this precaution, some of the larger mounts have warped 

 slightly, but with this exception the mount seems admirably adapted 

 for the exhibition of small specimens in upright cases. In Halls 

 35 and 36 the vertebrate fossils collected by the Bad Lands expedi- 

 tion of 1898 have been installed as fast as they were made ready. 

 The specimens now on exhibition include a magnificent skull of 

 Titanotherium ingens, being one of the largest and most perfect ever 

 found, six cervical and five dorsal vertebrae of the same individual, a 

 complete skull, but without lower jaws, of Tit anoi her turn iichoceras, 

 many miscellaneous bones of Titanotherium and skulls of Mesohippus, 

 Leptomeryx, Daphcenus and others. The complete series of forms of 

 DcBtnonelix, or " Devil's Corkscrew," secured by the same expedition, 

 has also been installed in an individual case. The forms shown are: 

 a spiral with an axis, a rhizome, and turning to the right; a spiral 

 without an axis, without a rhizome, and turning to the right; a spiral 

 without an axis, with a rhizome, and turning to the left; and a spiral 

 without an axis, with a rhizome, and turning to the right. A series 

 illustrating the phyllogeny of Dcemonelix, worked out by and received 

 from Prof. E. H. Barbour, has also been installed with the collection, 

 as well as photographs showing the mode of occurrence of the speci- 

 mens. The work of cleaning and mounting the above-mentioned 

 material occupied Assistant Curator Riggs, with some assistance from 

 H. W. Menke, during the winter and spring months. There was, 

 however, much other material partially cleaned which can be 

 made ready for exhibition in a short time. A complete skeleton of 

 Dinornis, which had been on hand since the opening of the Museum, 

 has been provided with an individual case and placed in Hall 35. 

 The series of photographs of the moon received from the Lick and 

 Paris Observatories has been framed and is exhibited in connection 

 with the moon model in Alcove log, together with a chart of the 

 moon's surface and a complete descriptive label. In the Department 

 of Zoology, the increased space given the offices of the Curator, by 

 enclosing the outside gallery within them, has been utilized to the 

 very best advantage, and although the rooms are still too small, yet 

 work can be carried on with much additional comfort and satisfaction 



