192 Annals of the Carnegie Museum. 



CARNIVORA. 



MUSTELA ? MINOR sp. IIOV. 



No. 848. Fig. 30. 



The type is a left mandibular ramus, lacking the incisors, the coro- 



noid process and the condyle. It was found in a clay cliff near the 



bottom of the Loup Fork beds in the Lower Madison Valley. It is 



smaller than the corresponding part of M. ogygia Matthew,^ being a 



little over one half the length. The 

 canine 's semi-procumbent. There 

 were three premolars. P^ is lost, but 

 its two minute alveoli can be seen ; 

 the anterior one is confluent with that 

 Fig. 30. Mustela minor (No. ^^ j}^g canine. P3I has a rudimentary 

 848). Lower Madison valley. Left , , t tj *i 1 i ■ 1 t^ a 1 



^ ' , ,., , , , . heel, in Ft the heel is better devel- 



ramus of mandible. 4 natural size. "* 



oped and there is a small accessory cusp 

 on the posterior outer side of the protoconid. There is also a small 

 anterior rudimentary cusp. The carnassial has a well-developed inner 

 cusp. M^ was small and set partly in the ascending ramus. The 

 angle of the jaw is nearly like that of the common weasel. The 

 masseteric fossa is very deep. 



lam in doubt whether this should be placed in the genus Musiela, 

 as it differs from most or all of the known species in having only 

 three crowded premolars and having a well-developed metaconid on 

 My. There are other slight differences. 



Dinocyon ossifragus sp. nov. 

 No. 790. Figs. 31 and 32. 

 Portions of the skull and teeth of this large carnivor were found in 

 a sandy stratum in the Loup Fork beds of the Lower Madison Valley. 

 Enough of the fragments have been fitted together to give some idea 01 

 the great size of the animal. Judging by the parts preserved it was 

 much larger than the grizzly bear, but not quite so large as the cave 

 bear, Ursiis spcheiis. The skull was evidently not less than seventeen 

 inches in length and probably considerably longer. The length of 

 the last upper premolar and the two molars is nearly the same as that 



'Fossil Mammals from Colorado. Memoirs Am. AIiis. Nat. His., Vol. I., Part 

 VII., p. 383, Figs. 8 and 9. 



