22 



angle of the tooth. The Palaeomeryx fold on account of the worn 

 condition of the tooth is represented by only a slight deflection of the 

 enamel. There is a cingulum on the anterior outer part of each molar. 



In molar 2 the Palaeomeryz fold is seen as a slight bulging of the 

 euamel, and the median pillar is flat on top as if worn by contact of 

 another tooth; but it does not extend as high as the other part of the 

 tooth. In section it is a shai-p oval with the narrow part pointing in- 

 ward. This in the thii-d molar is a small pillar ending in a point. 

 There is a minute one between the second and third lobes. The char- 

 acteristic fold is plainly seen on the third molar, extending from, the 

 inner point of the anterior crescent almost perpendicularly into the 

 median valley. 



MEASUREMENTS. 



Molai- 1. Molar 2. Molar 3. 



M. M. M. 



Length 0125 .014 .020 



Width 010 .0104 .0105 



Height OOG .008 .010 



The depth of the ramus under the teeth is .010 to .017 M. From 

 Loup Foi'k beds, lower Madison valley, Montana. 



Upper teeth. With the inferior dentition above described I have 

 associated a series of five upper teeth— the molars and last two pre- 

 molars. They ai'e very much like the corresponding teeth of BUisiu- 

 merjjx antilopinus Scott, and it may prove to belong to the same 

 species. In size these teeth match with those of the lower jaw above 

 described; and there is the same roughening of the enamel on the 

 molars; but they are rugose on the inside instead of on the outside. 

 The outside of the molars is more smooth as are also the premolars. 



In the molars the transverse diameter is greater than the antero- 

 posterior. On molar 2 the enamel on the internal crescents is perfectly 

 simple except that on the anterior side of the posterior crescent just 

 exterior to the termination of the posterior horn of the anterior cres- 

 cent there is a small projection of the enamel toward the posteror- 

 iuterior side of the antero-external crescent. This descends obliquely 

 and Joins the latter. There is a similar pillar on the corresponding 

 part of molar 3 but the enamel does not appear to be contiuuoui^ 

 with that of the crescent. 



Molar 1 is much worn so as to neai-ly obliterate the enamel lakes. 

 The antero-interior part of the tooth is broken off so the median pillar 

 is not shown. In molar 2 this pillar stands more obliquely than in 

 Cope's representation of Blastomeryx borealis.* The pillar is broken 

 on molar 3, but it is evidently longer than on molar 2. 



*The Artiodactyla Amer. Nat. March, 1899. p. 123. 



