* 
O. C. Marsh—New Tertiary Mammals. 487 
Measurements. 
Length of lower j jaw, from condyle to front of symphysis, 634: ™™* 
Depth of lower jaw, from top of orem ele, to —% ss ; 
Depth below front of last lower mo 3° 
Depth below first lower molar, - --- ae 
ength of symphysis, Z ead ye 
Length of last lower molar,.... ......-.------------- 417° 
Length of last lower premolar,_........--.---.------ 51° 
Transverse diameter, oe oe 
Length of first lower premolar, ee eee ere 31: 
Timverse diameter, 3.0 a s 
Distance ieee pr: Ohne oo 22°5 
? 
The remains on which the above description is based were 
found in the Miocene of Colorado by Mr. H. B. Sargent, Mr. 
J. W. Griswold, and the writer. 
Elotherium crassum, sp. nov. 
sembles somewhat the downward rolongation from the ZY ZO- 
matic arch in some Edentates and p 
and more compressed. The radius and ulna’ were separate - - 
very loosely united. The third and fourth metac 
nearly equal in size, and the second and fifth larger haat the 
corresponding bones of the pes. In the latter the first digit was 
wanting, and the fifth rudimentary. The hoof phalanges were 
short. The tail was long, and quite slender. _ species is 
suteruindinto | in size between FE. Mortoni and E. ingens. 
Measurements. 
Length of malar process below veneers gature,<..5:. 130° ™™- 
oo of symphysis of lower jaws, - - - 144: 
Antero-posterior diameter of lower canine,.-..-------. 32°5 
Transverse diameter, - - 28°5 
Transverse diameter of humerus at distal end, 81- 
Transverse diameter of radius at distal end, 15° 
Transverse diameter of head of tibia, 81° 
Length of third metatarsal, .------. . rox 
A rather smaller specimen, apparently of the same species, 
afforded the following : 
