142 PROCEEDINGS OP THE ACADEMY OP 



Remarks on Mastodon from New Mexico. Prof. Leidy directed 

 attention to portions of a lower jaw of Mastodon recently received 

 for examination from the Smithsonian Institution. The speci- 

 mens were from New Mexico, and were presented to the latter by 

 the Hon. W. F. M. Arny. One of the specimens contains a molar 

 resembling that from California, described before the Academy, 

 and supposed to belong to Mastodon obscurus, which was origin- 

 ally named from a tooth said to have been derived from the mio- 

 cene formation of Maiyland. The other fragment is part of the 

 symphysial prolongation of the jaw containing portions of tusks. 

 This resembles in its form and proportions the corresponding part 

 of the European Mastodon angustidens. These and other speci- 

 mens, including the portion of an upper tusk, having a band of 

 enamel, from California, described before the Academy under the 

 name of Mastodon Sheppardi, lead to the inference, that a species 

 resembling Mastodon angustidens, inhabited North America during 

 the middle tertiary period. The late Dr. Falconer states that he 

 saw at Genoa the cast of a lower jaw of a Ma^odon from Mexico, 

 with an enormous beak containing a large lower incisor. The 

 animal to which it belonged was named Mhynchotherium. This 

 perhaps maybe the same as the species named Mastodon obscunts. 

 A full description of the New Mexican and Californian fossils, 

 with plates, will shortly be given. 



June 18. 

 The President, Dr. Ruschenberger, in the chair. 

 Twenty-three members present. 

 The death of Dr. Wm. Stimpson was announced. 



June 25. 



The President, Dr. Ruschenberger, in the chair. 



Sixteen members present. 



The death of John Farnum, Maj. Sydney S. Lyon, John GL 

 Moore, and T. Clarkson Taylor, was announced. 



On favorable report of Committees, the following papers were 

 ordered to be printed : 



