168 Annals of the Carnegie Museum 



The teeth, judging by Leidy's figures/ differ in several particulars 

 from those of L. cvansi. In P^ the deuterocone is connected by a 

 ridge with the posterior portion of the tooth and by a narrow cingulum 

 with the anterior portion. P^ is the same, except that the deuterocone 

 and the anterior cingular ridge are better developed. Thus the teeth 

 are successively approaching the true ruminant pattern of the fourth 

 premolar, which is fully attained in this species. The median and 

 anterior outer pillars on the molars and the last premolar are not very 

 prominent. The inner and outer crescents of the teeth are not very 

 widely separated, yet the teeth are not so much worn as in the speci- 

 men figured by Leidy (Ext. Mam. Fauna, PI. XIV., Fig. 5). 



From the same beds as the specimen last described. 



Measurements. 



Mm. 



Length of molars and last three premolars 41 



Length of molar series 22 



Length of premolar series 20 



Length of P- 7 



Width of r^ 5.5 



Length of P^ 7 



Width of P^ 6 



Length of PA 6 



Width of P^ 7 



Length of molars each 7 



Width of Ml 8 



Width of M=- 9 



Width of M3 8 



Height of orbit 21 



Length of orbit 24 



Promerycoch(ERUS minor sp. nov. 

 No. 769. Fig. 12. 

 Of this species there is a large portion of a skull and mandible. The 

 upper and posterior portions of the cranium are gone. All the teeth 

 are represented except I^. It was found near Drummond, on the Hell- 

 gate River, in the same beds with Leptomeryx transmontanus and 

 Mesocyon ? driDiimondanus. 



1 refer it provisionally to this genus principally on account of the 

 form and size of the zygomatic arches. It seems to be intermediate 



1 Extinct Mammalian Fauna, of Dakota and Nebraska, PI. XIV., Figs, i, 4 and 5. 



