2 20 Field Museum of Natural History — Reports, Vol. IV. 



level. From the bottom of this canal two hollow logs drop vertically 

 to a wind chest in which air entrapped by the water falling through the 

 hollow logs is collected. From this wind chest the air is conducted to 

 the forge by hollow logs, leather and iron pipe, and a sheet copper 

 nozzle or tuyere. In the laboratory of vertebrate paleontology atten- 

 tion has been chiefly given to preparing the series of Uintah fossil 

 mammals collected in 1910. This series has now been practically all 

 prepared. The following specimens were worked out during the year: 

 Two skulls and one lower jaw of the low-ground ungulate Metarhinus 

 riparius; one skull of the closely allied Metarhinus cristatus; two skulls 

 and one nearly complete skeleton of the large river titanothere Doli- 

 chorhinus longiceps; a skull of the new species Mesatirhinus superior; a 

 skull of the new genus Rhadinorhinus ; one skull and two pairs of lower 

 jaws of the early rhinoceros Amynodon; an incomplete skull of the 

 great homed amblypod Eohasileus; one of the nearly allied Uintatherium; 

 two lower jaws of the small cursorial mammal Triplopus; an incomplete 

 skull of the archaic and little known Stylinodon; and a large and well- 

 preserved skull of the broad-headed Crocodilus. All of these skulls 

 or skeletal portions where desirable have been mounted with metal 

 supports on standard bases with the exception of the skeleton of Doli- 

 chorhinus which was mounted in half relief in plaster preparatory to 

 installing it in a special floor case now in process of construction. The 

 specimens thus prepared and those of the same region worked out 

 previously afforded the Assistant Curator of Paleontology material 

 upon which a description of the fossil -bearing horizons of the Uintah 

 formations and a description of a new subfamily, one new genus and 

 four new specimens of titanotheres were prepared and published during 

 the year. Opportunity was also found for preparation in the laboratory 

 of vetebrate paleontology of some additional material collected on 

 previous expeditions. This included among material collected by the 

 expedition of 1906, a complete skeleton and additional skull of Steneofiher 

 barbouri, two skulls of Pleurolicus leptophrys and portions of skeletons 

 of allied species, and from material collected in 1905 a skeleton of Mery- 

 coidodon gracilis and partial skeletons or skulls of Ischyromys cristatus, 

 Aceratherium sp. and Protoceras celer. Work upon the study series of 

 the mineral collection was carried on at intervals as opporunity could 

 be found and the groups of carbonates and oxides were fully rearranged. 

 Individual trays were provided for the specimens and they were labeled 

 and grouped according to species and localities. The chemidal labora- 

 tory with apparatus and equipment was moved from Jefferson Avenue 

 to Lake Avenue during the year. The new quarters occupied contain 

 570 square feet of well-lighted space and are provided with water, 



