Hatchf.r: Fore T.imi; anu Manus oi^- Rrontosaurus. 357 



and Diplodocus has been erroneously constructed both in Osborn's 

 figures and in my own restoration of the skeleton of the latter genus, 

 where, as stated in the text, 1 followed that author when reconstruct- 

 ing the anterior limbs and feet, parts of the skeleton not represented in 

 our collections. 



Discovery ok iiie SKK.r.E'roN of Rrontosaurus (No. 563). 



The skeleton with which the limb and foot under discussion be- 

 longed was discovered by Mr. Charles W. Gilmore, a graduate of the 

 I'niversity of Wyoming and member of the staff of the Section of 

 \'ertebrate Paleontology of this Museum. It was found in the shales 

 of the Atlantosaurus beds, about one mile south of Sheep Creek in 

 Albany County, \\'yoming. I'he i)articular locality (Quarry E) at 

 which the skeleton was dug up was distant about one (juarter mile 

 from ()uarry D, which had yielded the two skeletons of Dip/odoci/s 

 i-d/z/e^wV (Xos. 84 and 94) belonging to this Museum's collections. 

 While both quarries are in the same bed of shale, Quarry E is in 

 a distinctly lower horizon than Quarry 1 ). Careful measurements 

 taking into consideration the dip of the strata would probably place 

 the horizon of (Quarry I) from 30 to 40 feet above that of Quarry E. 



The different parts of the skeleton recovered were for the most part 

 disarticulated when found. But when, as with the present limb and 

 foot, any bones were found in nearly or quite their normal positions, 

 such portions were taken up and packed by Mr. Gilmore with such 

 precaution and skill that they have been received in the laboratory 01 

 the Museum in the same positions in which they were found and still 

 partially imbedded in the original matrix. Moreover, in order that 

 no possible aid should be lost which a knowledge of the various posi- 

 tions of the different bones when found in the quarry might furnish in 

 assigning each to its proper position in the skeleton after their arrival 

 in the Museum, Mr. Gilmore ])repared an excellent diagram of the 

 quarry and carefully located on this each bone as it was uncovered 

 during the process of excavation, thus securing a permanent and reli- 

 able record of the relative positions of the different parts of the skele- 

 ton as they lay imbedded in the rock. 



Relative Positions of the Humerus, Radius, Ulna and Manus 



IN THE Matrix. 

 When found the forearm and manus lay with the palmar side up. 

 The humerus was not in position at the proximal end of the radius 



