G. I. Adams — Extinct Felidce of North America. 427 



which was known at that time, the Princeton Museum contains 

 besides duplicate portions of the skeleton, a humerus and a few 

 bones of the carpus. These need no special description for 

 my purpose here. The genus Dinictis stands ancestral to the 

 genus Hoplophoneus and the species felina agreeing so closely 

 in size with H. primcevus makes a comparison very interest- 

 ing. I shall state here the points in which I). felina differs, 

 although many minor points which would be apparent to the 

 eye are necessarily omitted. 



The skull is slightly larger and is higher in the frontal region. 



The mandible has a smaller flange. 



The glenoid process is not so low and the post-tympanic 

 does not show a tendency to approach the post glenoid. 



The dentition is I-fC-J-Pm-fM-J. The incisors are small, 

 spatulate and in an even transverse row. The outer one is con- 

 siderably larger than the others. The canine is larger at the 

 base and not quite so long. The superior sectorial has an inner 

 cusp but no anterior basal. The inferior sectorial has a better 

 developed heel. The second lower molar is much reduced but 

 constant. 



The foramina are the same. 



The skeleton is of nearly the same size but not so massive. 



The limb bones have more slender shafts and not quite so 

 large extremities. 



The ulna and radius and the tibia are not so short in propor- 

 tion to the lengths of the humerus and femur, which are almost 

 identical in length with those of H. primcevus. 



The manus and pes are narrower and longer. 



The unguals have weak hoods but were retractile, although 

 perhaps not perfectly so. 



The generic distinctions are to be found in the structure of 

 the sectorials, the character of the incisors and the unguals, 

 although in distinguishing the two the other points above men- 

 tioned can be relied upon. 



Measurements. 



H. primsevus. D. felina. 

 Length of skull condyles to premaxillary 



border 148 154 mra 



Length of cranium to anterior rim of orbit.. 99 108 



Length of bony palate __ 79 72 



Breadth of bony palate at sectorials 61 69 



Breadth of skull at canines __ 47 50 



Breadth of skull at post-orbital constriction, 35 33 

 Length of mandible from condyle to lateral 



incisor _. 112 119 



