VERTEBRATE FAUNA OF THE BLANCO BEDS. 51 



Measurements, 



Mm. 



Depth of premaxillarj' notch (axial) 33 



Width between canine-molar alveoli 43 



Width of inferior face of premaxillaries 35 



Width posterior to canine molars 27 



Width of premaxillaries at posterior external angle of canine-molar alveolus 83 



Width of palate between molars 18 



Transverse diameter of occipital condyle 28 



Diameters canine-molar alveolus 3 anteroposterior 25 



( transverse 18 



Anteroposterior width inner face of alveolus of middle molar 15 



! longitudinal 61 



anteroposterior (greatest) . 14 



transverse 25 



The specimen above described was found by Mr. W. F. Cummins. 

 The discovery is of much interest, as carrying back our knowledge of 

 the presence of this genus of sloths in North America to an older terrane 

 than that (the Megalonyx beds) in which it has been hitherto known to 

 occur. 



CARNIVORA. 



Three species of tliis order were found, a number about in proportion 

 to those of other orders. Their remains are in ratlier a poor state of 

 preservation, as tlie conditions of deposit appear to have been unfavora- 

 ble to the integrity of any but large and strong bones and teeth. Three 

 families are represented, viz.: Mustelidse, Hysenidse and Felidse. The 

 discovery of HysenidiB is a noteworthy circumstance, and adds materially 

 to the Old "World facies of this part of the fauna. The absence of the 

 Canidse, usually by far the most numerous family of Carnivora, is curious, 

 and is probably accidental. 



CANIMARTES, Cope. 



American Naturalist, 1892, p. 1029. 



True molars f; second inferior molar with one root; inferior secto- 

 rial with well developed blade, trenchant heel, and large metaconid. 

 Superior sectorial with small protocone anterior in position, and without 

 distinct anterior basal lobe. 



As in the typical genera of the family, the first superior tubercular 

 molar has an expanded obtuse internal cingulum. As compared with the 

 genus Mustela, to which it approaches, Canimartes differs in the posses- 

 sion of the superior M. ii. Its dental formula is the same as those of 

 Stenoplesictis Filh. and Amphictis Pom. ; but it differs from both in im- 

 portant details. Thus the heel of the sectorial is cupped, and the inferior 

 tubercular is elongate and quinquetubercular in the former; and in the 



