222 DOUGLASS — CRETACEOUS AXD LOWER TERTIARY. (Aprils, 



taken alone would strongly incline one to the belief that the form- 

 ation containing them is contemporaneous with the Torrejon of 

 New Mexico. This is made still stronger by nearly every specimen. 

 There are a radius and ulna which are different from any found in 

 New Mexico, so that they cannot be assigned to any genus with cer- 

 tainty, and there is a premolar much like that of Pantolambda, but 

 indicating an animal much smaller than any species of that genus, 

 to which, however, I refer it with doubt. The other four are 

 cogeneric if not cospecific with Torrejon forms. 



Miocl<z7iiis acolyius (Cope). (Plate XXIX, Figs. 9 and 10.) 



This is represented by a small portion of a mandible with a molar 

 tooth which is almost unworn. The anterior cusps are connate at 

 base and much higher than the posterior ones. 



Anisonchus Cope. (Plate XXIX, Figs. 3-5.) 



This is also represented by a portion of a mandible. There are 

 two teeth, a fourth premolar and a first molar. They are of nearly 

 equal length. In size and character the teeth are nearly like A. 

 sectorius Cope. It may, however, be another species. 



Euproiogonia puercensis (Cope). (Plate XXIX, Figs, d-'^.) 



Represented by a third premolar and a second molar of the right 

 side and a third molar of the left. The molars differ somewhat 

 from the type. Matthew has carefully studied the many specimens 

 in the American Museum collection and finds a wide range of varia- 

 tion in the teeth, but no constant characters that will serve to sepa- 

 rate the various forms which Cope has named. Of the many speci- 

 mens no two appear to be exactly alike. I have compared the 

 present specimens with those in the above collection and find that 

 they do not differ so much from some of the American Museum 

 specimens, as the latter vary among themselves. What comes near- 

 est to being a distinguishing character is the smallness of the hypo- 

 cone as compared with the protocone, but this is at least nearly 

 paralleled by some of the above-named specimens. 



Pantolambda (?) (Plate XXIX, Figs, i, 2, 14.) 



There are the greater portions of a radius and ulna, and two 

 phalanges which are different from anything described from the 



