G9 



oC tlic opposite side and several other bones ot the skeleton, near the Lodge- 

 Pole Trail, crossing Dr}' Creek Valley. The specimen was found in part ex- 

 posed and partially imbedded in the indurated clay of a bntte, in company 

 with quite a profusion of well-preserved shells of Helix tvi/omingensis. 



The jaw resembles in its form that of Hyrachyus agrarius, and also that 

 of the recent tapir. It contained a series of six molars, of which it retains 

 the back four.. The molars are separated by a wide hiatus from a continuous 

 arch of alveoli, for the accommodation of the incisors and canines, which corres- 

 pond in number with those of the tapir. 



The depth of the jaw is rather less than in the fragments prciviously 

 described, while the dimensions of the molar series is nearly the same. The 

 measurements of the specimen are as Ibllows : 



Lines. 



Length of space from incisive alveoli to back of last molar 42 



Leugtli of space occupied by f lie molar scries 24 



Length of space occupied, by the true molars 14i 



Autero posterior diameter of last molar 41 



Length of symphysis ... IG 



Length of hiatus in advance of molars 13 



Depth of jaw below uiolars 9J 



An upper-jaw fragment, recently sent to me by Dr. Carter, I suppose to 

 pertain to Hyrachyus iianiis. It contains the fangs of the anterior three 

 premolars, and the entire last one, which is represented in Figs. 21, 22, Plate 

 XXVII, magnified two diameters. This premolar resembles the corresponding 

 tooth o{ H. agrarius, but the ridge in the latter, w^hich represents the postero- 

 internal lobe in the true molars, is reduced to the smallest rudiment. 



The space occupied by the four premolars measures 11^ lines. The 

 ' breadth of the last premolar is 3.2 lines ; the width transversely is 4 lines. 



LOPHIOTHERIUM. 



LOPHIOTHERIUM SYLVATICUM. 



The genus Lophiotherium was proposed by Gervais, from some fragments 

 of several lower jaws with molar teeth, which were found in association with 

 remains of true Palseotheria, in a formation of France which he regards as 

 belonging to the upper Eocene Tertiary. The genus is viewed as a tapiroid 

 pachyderm closely allied to Lophiodon, though the molar teeth appear very 

 unlike those of the latter. 



Daring Professor Ilayden's exploration of 1870, a specimen was found on 



