1^0.2.] COPE ON CANID^ OF LOUP FORK EPOCH. 389 



wolf. The external infraorbital foramen is relatively and absolutely 

 large, and issues above the anterior border of the superior sectorial 

 tooth. 



Measurements. 



M. 



Lengtli of entire superior dental series on middle line of palate 067 



Length of molar series 045 



Length of alveolus of canine 010 



Length of premolar series 034 



Length of sectorial or base of crown 013 



Width of sectorial in front 010 



Length of first true molar externally 008 



Width of first true molar externally 013 



From the preceding it is evident that the JSlurodon hycenoides differs 

 from the two other species of the genus in its inferior size, the relatively 

 smaller tubercular molars, which are wider interiorly, and the much 

 larger internal anterior lobe of the superior sectorial. 



The specimen on which it rests was found in Southern IsTebraska by 

 Mr. E. H. Hazard. 



Canis beachypus sp. nov. 



This dog is represented by a considerable part of a skeleton, with 

 skull, in a moderately good state of preservation. Both superior sec- 

 torial teeth are wanting, as well as most of the dorsal vertebrae and the 

 humeri, femora, and tibiie. Some metacarpals and metatarsals with an 

 astragalus and some phalanges, give characters of the feet. The size of 

 the spec ies is about that of the Canis latrans. 



As compared with the coyote, the prominent marks of distinction are 

 the small sectorial teeth, the elevated sagittal crest, and the small 

 feet. The sectorials have the character I have already ascribed to the 

 sectorials of all the older carnivora, including the dogs of the Lower 

 Miocene, and which has since been esjiressed by Huxley in the term 

 " microdont." It prevails also among the dogs of the Loup Fork epoch, 

 although the species of uTJlurodon may be regarded as exceptions. The 

 sagittal crest commences at a point above the anterior border of the 

 glenoid surface, and extends posteriorly to above the foramen magnum. 

 It is quite elevated and thin. The astragalus is well grooved, and, while 

 as wide, is a little longer than that of the Canis latrajis. The third me- 

 tacarpal is one-fourth shorter than that of C. latrans, and the fifth met- 

 atarsal one-fifth shorter than the corresponding bone of C. latra)is. 



The length of the pelvis is equal to that of the ramus of the mandible, 

 and is as large as the average of that of those of C. latrans. The cerv- 

 ical vertebrae are about the size of those of the same species, and are 

 not so much depressed. The crest of the axis is considerably higher, 

 and extends well fore and aft. The otic bullae are not very large, but 

 are much swollen. The i)aroccipital processes arfe well developed, and 

 project backwards nearly as far as the posterior face of the occipital 



