42 O. C. Marsh—Notice of some new Fossil Mammals 
* 
Dicotyles Hesperus, sp. nov. 
pair of cones. e basal ridge is also more strongly developed, 
especially on the outer margin, where it is continuous. In © 
Measurements. 
Length of part of upper jaw with four posterior teeth, 19° lines. 
Length of same, with three molars, - --- ------ ier tS he See 
tero-posterior diameter of last upper molar,_...---. 56 “ 
Transverse extent of same, 4° 
Antero-posterior diameter of penultimate upper molar, 54 “ 
This specimen, for which the writer is likewise indebted to 
Rev. Mr. Condon, is from the same locality and geological 
horizon as the species last described. 
Hypsodus gracilis, sp. nov. 
oming, and supposed by him to indicate an anl- 
r? allied to the suilline family.* It may readily be 
: * Proceedings Philadelphia Acad. Nat. Science, 1870, p. 109. 
