f) AXNALS OF IHK CaRNRGIE MuSEUM. 



gist in charge, in the cohinins of Science, New Series, Vol. XII, page 

 719. The work of excavation, begun at Camp Carnegie on Sheep 

 creek, Albany county, Wyoming, by Dr. J. I.. Wortman in the sum- 

 mer of 1899, was continued under the efficient direction of Mr. O. A. 

 Peterson. The work yielded most satisfactory results. Additional 

 portions of the skeleton of the great Diplodocus found in 1899 were 

 recovered. A second specimen, apparently belonging to the same 

 genus and species, was found in close proximity to the specimen dis- 

 covered by Dr. Wortman and his party. The greater portion of this 

 skeleton was recovered. Specimens representing six different individ- 

 uals of Brontosaurus were unearthed not far away, and other important 

 remains of Jurassic dinosaurs were recovered. The bones when 

 packed made a carload, and were brought to the Museum in Novem- 

 ber, and have been deposited in the palaeontological laboratory. 

 Professor Hatcher, assisted by Mr. W. H. Utterback, devoted some 

 time to a re-exploration of the Laramie beds in Converse County, 

 Wyoming. It was here, a number of years ago, that Professor Hatcher 

 discovered much of the most important material acquired by the late 

 Professor Marsh, and belonging either to his collection, now at Yale 

 University, or preserved in the U. S. National Museum at Washing- 

 ton, as part of the collections turned over to that institution by the 

 U. S. Geological Survey. Professor Hatcher was not successful in re- 

 covering a complete skeleton of Triceratops, as he had hoped to be 

 able to do, but nevertheless gathered together a great deal of impor- 

 tant material representing the mammalian and ichthyic fauna of the 

 Laramie deposits. One of the most interesting discoveries was that of 

 a specimen showing the nature of the dermal covering of Claosaurus 

 Marsh, an account and figure of which appear in this number of the 

 Annals. Professor Hatcher subsequently removed from the location 

 which he had chosen in Converse County to Sioux County, Nebraska, 

 where in the White River beds he made fine collections, in reference 

 to some portions of which the present number of the Annals con- 

 tains an account from his j^en. The expedition, viewing the results 

 in their entirety, appears to have been very important, and has added 

 a great deal of material to the collections of the Museum, which, 

 when it shall have been mounted and prepared for exhibition, will not 

 only serve to interest and attract the general public, but will mate- 

 rially add to our knowledge of the life of the past. Mr. W. H. LTtter- 

 back, one of Professor Hatcher's assistants, remained in the West, and 



