2 20 Bulletm American Museum of Natural History. [Vol. XIX, 



posterior cingulum. The first molar has four chief ctisps, the external 

 ones somewhat crescentic, the postero-internal smaller than the others, 

 and a posterior cinguktin with small hypoconid. P^ with diastemata 

 behind and in front of it. 



No. 9670 shows the second and third molars of similar composition 

 to the first except that the hypoconulid in nij is equal to the other 

 cusps and posterior to them. 



This species appears to be closely related to 5. obtnsilobits 

 Cope, but the posterior cingular cusp (heel-cusp) is lacking, 

 and p2 has small diastemata before and behind it, while 

 there are none in 5. obtusilobus. In size and other characters 

 it is identical as far as the type of Cope's species permits 

 comparison. 



Stibams has been conjectured to be allied to the camels; 

 its actual position has, I think, never been suspected. It is, 

 in a way, a link between the Leptochoeridae and Leptomeryx, 

 and makes it more certain that the former is truly an artio- 

 dactyl family. '' Lcptochceriis" qnadricuspis Hatcher is prob- 

 ably a species of Stibarus. 



Measurements. 

 Length p^-mi 27.3 mm. 



P= 7 



" P3 7 



" P4 4 



" m, 5 



Depth of jaw below ps 7. 



" " mi 10 



width 2.1 mm. 

 6 " 2.7 



9 " 3-7 



o " 4.2 



OREODONTID^. 



Bathygenys alpha Douglas. 



We have three specimens referable to this genus and species : 

 parts of two upper jaws and one lower jaw. I identify these 

 with Mr. Douglas's species in spite of wide distinctions in the 

 drawing of the teeth of his cotype specimen. These, if cor- 

 rectly drawn, could hardly be Oreodon teeth; they are fully 

 as narrow and trenchant as those of Leptomeryx. As, how- 

 ever, he compares the teeth to those of Merycochcrrus, which 

 are short and wide and crowded, I assume that the error is in 



