235 



animal with the name of Mastodon Shepardi, in honor of Professor C. U. 

 Sheparcl. 



Since writing the above, I have received another specimen from Professor 

 Shepard, consisting of a last inferior molar tooth, obtained by Dr. Yates in 

 Contra Costa County, California. It is almost identical in form and size with 

 the one previously described from the same locality, but appears to have be- 

 longed to an older individual, as indicated by the more worn condition. 



From the Smithsonian Institution I have recently received for examination 

 some remains of a mastodon and an elephant, which were found near Santa 

 Fe\ New Mexico, and were presented to the institution by the Hon. W. F. 

 M. Amy. The mastodon remains consist of three fragments of a lower jaw, 

 a vertebral body, and a rib-fragment. They are white, and from adherent por- 

 tions of matrix appear to have been imbedded in an indurated clay. The 

 cancellated structure of the bones is filled with the same matter together 

 with crystalline calcite. 



The lower-jaw fragments appear all to have pertained to the same specimen. 

 One of them, represented in Fig. 1, Plate XXII, consists of a portion of the 

 right ramus containing the last molar tooth nearly of the size of the corre- 

 sponding part in the American mastodon. The molar tooth, represented in 

 Fig. 4 of the same plate, has lost the portion back of the third ridge of the 

 crown. The portion preserved sufficiently resembles in its construction the 

 corresponding portion of the California tooth above described to belong to 

 the same species, which I suspect actually to be the case. It also resembles 

 more nearly the corresponding portion of the same tooth of M. augustidcns 

 of Europe than it does that of the M. americanus. 



The other jaw-fragments, represented in Figs. 2, 3, form together the 

 anterior extremity of an enormously prolonged symphysis, like that of 31. 

 augustidens. The specimen is rather more than a foot in length, and contains 

 portions of tusks extending through the pieces and broken oif on a level with 

 the extremities of the symphysis. This has been somewhat crushed laterally, 

 so as to disarrange the proper relative position of the two tusks. It is of 

 nearly uniform width, but widens at the posterior extremity. Below, it is 

 slightly convex or nearly straight longitudinally, and is depressed along the 

 median line. The sides are convex, and extend upward in ridges which form 

 the boundaries of a deep groove at the upper part of the symphysis. The 

 groove is narrower behind, and becomes shallow in front. The tusks are 



