OF THE WHITE RIVER BEDS OF MONTANA. 263 



of the femur of a rhinoceros, probably a small Ccenapus. A little distance away were 

 remains of a Titanotherium. A mile or two farther north were quite a number of Titano- 

 therium bones and there I obtained large portions of two skeletons. 



The specimen which I take as the type of this species is the greater part of the 

 anterior portion of a cranium (No. 50). Part of the snout and right maxillary are gone, 

 but the root of the canine on the right side and the last two premolars and all the molars 

 on the left side are preserved. It is only a little smaller than Oreodon gracilis. 



Compared with L. platyceps, the frontal plane is still more flat but narrower ; the lach- 

 rymal depressions are larger, deeper and different in shape ; the infraorbital foramen is 

 farther forward, being above P 3 instead of P 4 ; the nasals are different in^ shape and 

 extend farther back. 



The nasals are narrow, but broadest between the slender tips of the frontals. From 

 bere they narrow anteriorly to where they are broken off, and posteriorly to where they end 

 in two small tips separated by a small wedge of the frontals. The latter, of course, may 

 be only an individual character. This posterior extension of the nasals with the narrow- 

 ness of the top of the skull make the anterior projections of the frontals rather long and 

 narrow, and they end in slender tips which are wedged in between the nasals and the 

 raaxillaries. The lachrymals are larger than in L. platyceps, are not so nearly semi- 

 circular and they send up a peninsula of bone toward the nasals. The lachrymal depres- 

 sions are deep and longitudinally elliptical. The teeth are so much like those of Oreodon 

 gracilis as not to need a separate description. Compared with the specimen (Princeton 

 Col., No. 11396) which I have used for comparison, P' 2 is a little more triangular and 

 the median and anterior outer horns of the crescents are less prominent. One of the 

 supraorbital foramina is farther back than the other, and shallow channels can be traced 

 to the infraorbital foramina as in L. platyceps. 



Among the other fragments is part of a skull (No. 52) that appears to be different 

 from either of the preceding, but it belongs to a young animal. A small part of the post- 

 orbital process of the frontal is gone, but it was undoubtedly short and the orbit open 



behind. 



There is also a series of milk teeth (No. 51), but not enough of the skull to deter- 

 mine the species. 



Measurements of type specimen. 



M. 



Length of dental series, exclusive of incisors 05 4 



Length of molar series 028 



, , ,. . 005 



Length of canine 



..,. ,'.. r 0045 



W ulth of canine 



Length of P* ° 06 



Width of Pi 0005 



