COPE.J PALEONTOLOGY MIOCENE PERIOD. 505 



hind. The canines are lost, but their alveoli indicate huge size; the 

 root possesses an open groove on the front of the inner side. The outer 

 incisors are large and close to the canine; the last molar is two-lobed 

 and rather small. 



Measurements. 



M. 



Length of series of inferior molars 0.370 



Long diameter of canine alveolus, (28;5 lines) 060 



Length of true molar series 140 



Length of crown of fourth premolar 053 



Height of crown of fourth premolar, (worn) 022 



Width of symphysis between canines ^ 090 



Length of chin-j)rocess, (3.5 inches) 090 



Width of chin-process antero-posteriorly 080 



Length of interval to second tuberosity 150 



Length of basis of second tuberosity 075 



Length of symxjhysis 175 



Depth of ramus atP. m.2 100 



The only species with which it is necessary to compare the Pelonax 

 ramosus is the Elotlierium imperator, I^eidy, {=E. superhum^ an older 

 though less appropriate name,) known from a canine and incisor-teeth 

 from California and Oregon. The long diameter of the canine is to that 

 of E. ramosum as 5J to 7^. 



C A E N I V O E A . 



HY^NODOIS^ Laiz. et Par. 



Hyjenodon hoeeidus, Leidy, Ext. Fauna Dak., &c., p. 39 : Cope, Bull. 

 U. S. GeoL Surv., Ko. 1, p. 9. 



Hyjenodon ceucians, Leidy, loc. cit, p. 48; Cope, loc. cit., p. 9. 



This and the preceding species were found rather rarely, and in about 

 equal i^roportions. 



AMPHICYON, Larl. 



Amphicyon vetus, Leidy, Ext. Fauna Dak., &c., p. 32. 



CANIS, Linn. 



Canis haetshoenianus. Cope, Synop. Few Vert. Col., 1873, p. 9. 



Indicated by a portion of the mandibular ramus with the first tubep- 

 cular molar and alveolus of the second. The species was as large as the 

 Canis latrans. The anterior molar preserved has an interrupted cingu- 

 lum on the outer side, which projects considerably in front, thus inter- 

 rupting the parallelogramic outline of the crown. The outer anterior 

 tubercle is much the larger, while the inner ones are both obsolete. In 

 G. gregarius^ Cope, the tubercles are equal, and there is no cingulum. 

 Eoot of tubercular molar subround in section as in C. grcgariiis. 



Measurements. 



Length of bases of M. II and III 0130 



Length of base of crown of M. II 0090 



Width of base of crown of M. II 0060 



Elevation of crown of M. II 0050 



Named for my friend, Dr. Henry Hartshorne, professor of natural 

 sciences in Haverford College. 



