Oct., 1905. Annual Report of the Director. 



361 



lected by the paleontological expedition of 1904, has been installed, 

 also a large carapace, two feet four inches in length, of a Cretaceous 

 turtle, and numerous bones of Triceratops collected by the same 

 expedition. Space for the installation of these specimens was ob- 

 tained by the reinstallation of three cases which had previously been 

 devoted chiefly to invertebrate fossils. The result has been to im- 

 prove the appearance and sequence of the collections as a whole. 

 The life-size model of the skeleton of Dinoceras, Hall 61, which had 

 become much discolored and badly cracked, has been thoroughly 

 refilled and repainted so as to be now in excellent condition. In the 

 paleontological laboratory attention has been devoted chiefly to 

 cleaning and mounting the large amount of Triceratops material 

 collected in Montana in 1904. Of the three skulls collected one has 

 been fully worked out and mounted for exhibition. This skull is 

 one of the largest and finest of this extraordinary reptile ever found, 

 and possesses features new to science. The length of the skull 

 is six feet, six inches, its width at the frill four feet, four inches, 

 and its height, including horns, three feet, six inches. The following 

 portions of the skeleton of the same individual have also been pre- 

 pared for exhibition: Right scapula and coracoid, left scapula, right 

 and left humerus, right and left ulna, right ilium, right and left pubis 

 and seven caudal vertebrae. Another skull of Triceratops has been 

 partially worked out. Remains of a large Cretaceous turtle and 

 some Plesiosaur remains collected by the same expedition have also 

 been worked out. The collection of Silurian and Devonian inverte- 

 brate fossils made in western New York by Mr. Slocom in 1904 and 

 numbering over 11,000 specimens, has been carefully classified, 

 cleaned and identified, affording representatives of nearly 300 species, 

 for the most part new to the collections. The rock cutting and 

 grinding machine, which has hitherto been worked by foot power 

 only, has been connected with the water motor and a mechanical 

 abrasive and water feed provided. A series of laps suitable for the 

 various stages of grinding and polishing has also been provided. By 

 the use of this apparatus a large number of rock and mineral speci- 

 mens have been polished in the laboratory at a slight cost, improving 

 their appearance and exhibition value. The relief map of Mt. Shasta, 

 Hall 76, which had begun to scale badly, was treated to secure a firm 

 adherence of the outer coating and the whole surface repainted. In 

 Hall 77 a framed geological map of Illinois has been installed. The 

 large and monotonously duplicated series of tobaccos and cottons 

 that has, from the opening of the Museum, filled the North Court 



