DEPARTMENT OE MINERALOGY 



65 



specimen known as the "Baltimore Mastodon," and series of 

 upper and lower teeth which together w4th the above form the 

 principal subject of Professor Warren's great memoir jjublished 

 in quarto form in Boston in 1855. 



The collection also includes the backbone and portions of 

 the skull of the whale-like animal Zeuglodon formerly known as 

 Hydrarchiis. . Another important feature of the collection is a 

 series of Connecticut valley footprints of Dinosaurs, many of 

 the specimens being of rare perfection. The skeleton of the 

 Ornithorhynchus in the collection was probably the only one in 

 the country, when it was obtained. There are also casts of 

 palaeontological specimens, some of which are very difficult to 

 procure at the present time. 



DEPARTMENT OF MINERALOGY. 



jOME interesting additions to the Mineral Cabinet 

 are worthy of notice, among which is a group of 

 Olivine (Peridot) crystals from Egypt. The crys- 

 tals show prisms, domes and pyramids with 

 noticeable compression. This new source of Peri- 

 dot has considerable interest. The Peridot gems of collections 

 have largely come from the East, but their exact origin was 

 unknown. Mr. Kunz has suggested that they must date back 

 to the time of the Crusades, having been brought from the East, 

 and from time to time found their way into commerce from 

 churches and cloisters. The new locality is somewhere in Upper 

 Egypt near the Red Sea, and was iDrobably the source, or near 

 the source, of the gems of the Levant. Some fine cut Peridots 

 are to be seen in the Morgan Collection of Gems. 



A specimen of the new and uncommon Chalmersite is among 

 these additions. This mineral occurs in fluted orthorhombic 

 crystals on dolomite, associated with pyrrhotite, chalcopy- 

 rite and siderite in the gold mine at Morro Velho in Minas Geraes, 

 Brazil. The crystals are usually twinned, lustre metallic and 

 color a bronze yellow. 



