10 



As compared with the superior canine of the Baptophilus squalidens, 

 which the present specimen resembles in its compression and fine denticu- 

 lalion, it differs in its greater relative length and in the presence of the 

 lateral open sulci. 



Measurements. M. 



C antero-posterior , 0120 



Diameter at base • . | greatest .0036 



transverse - ° 

 V I median 0032 



Length of a denticle on base 000143 



Mach^erodus BRACHrnps, sp. nov. 



This species, which ranged in size from that of the puma to that of the 

 jaguar, is represented in my collection by parts of two crania ; by an en- 

 tire cranium ; by a left mandibular ramus with parts of the skeleton, and 

 by several isolated teeth. The characteristics of the molars in both jaws 

 are those of the other species of this genus. The first superior pre- 

 molar is two-rooted and small, occupying the middle of the short space 

 between the canine and the second premolar. The latter is large, and has 

 no anterior basal tubercles. Sectorial without anterior basal tubercle. 

 Tubercular tooth small, transverse. 



The crania of the three individuals mentioned agree in many particulars ; 

 and especially in the very short face and muzzle. This may be more ex- 

 actly expressed by comparing the interspace separating the second and third 

 premolar from the canine with the length of the base of the latter. From 

 tliis it is seen that the two dimensions are equal, while in the M. primce- 

 vus the first mentioned is much the longer of the two. In the mandible 

 referred to this species another character is seen in the relatively large 

 size of the premolars, which much exceeds that of the corresponding teeth 

 in M. primcBv'us, The first is stated by Leidy to have an anterior basal 

 cusp, which is wanting in the M. bracliyops. 



In the first cranium the sagittal crest is well developed. The canine 

 tooth has an oval section at the base of the crown, whose long diameter 

 somewhat exceeds the distance between it and the anterior base of the sec- 

 ond premolar. The infraorbital foramen is large. The second specimen, 

 the left maxillary and part of malar bones with teeth, shows that the 

 length of the base of the sectorial tooth equals the space between it and the 

 middle of the first premolar. The superior aspect of the proximal portion 

 of the malar bone is horizontal, constituting a surface not seen in the spe- 

 cies of FeMs. The canine is robust, with an oval section at the base. The 

 posterior denticulate cutting edge extends higher up than the anterior, and 

 ceases at the base of the enamel. The anterior cutting edge is on the in- 

 ner side of the anterior face of the tooth. 



Measurements. 



No. 1. M. 



Length of muzzle in front of canine 017 



T -v , ,• • . , (anteroposterior 018 



Diameter of canine at base-] ' 



(transverse 011 



Distance from canine to p. M. 2 017 



