140 Bulletin American Museum of Natural History. [Vol. XVI. 



sial section of the Mustelinae, typified among modern genera 

 by Putorius, among ancient ones by PalcBOgalc, rather than 

 to the section with more tubercular teeth, typified among 

 modern genera by Mustela, among ancient ones by Plesictis, 

 Stenoplesictis, etc. The latter group retains the metaconid 

 on mi, and correspondingly the paraconule on m^-. The 

 former group has no metaconid on the lower carnassial, and 

 on the upper tubercular there is no trace of conules, and the 

 protocone is smaller in proportion. The primitive members 

 of this Putoriine group are hardly distinguishable from primi- 

 tive felines; Proailurns, considered by most writers as a 

 Felid, is placed by Dr. Schlosser (advisedly as it seems to the 

 present writer) among the Mustelids of this group. BmicB- 

 liiriis presumably belongs to the primitive division of the 

 Putoriine group. 



The White River skull under discussion belongs unques- 

 tionably to the Putoriine group, and with the primitive mem- 

 bers thereof. It has the strongly transverse tubercular, with 

 reduced protocone and no paraconule. The upper teeth cor- 

 respond in size and in proportions with the lower teeth on 

 which BuncBliirus is based. These were found in the same 

 formation and horizon as the skull, at a locality about fifty 

 miles further to the eastward. 



