PETERSON : NEW CARNIVORES FROM MIOCENE OF WESTERN NEBRASKA 221 
First Dorsal Vertebra.—The centrum of the first dorsal is, as in Daphanus, 
broad and depressed, which seems to be true of the dogs generally. The trans- 
verse process is heavier than in Canis lupus. The postzy- 
gapophyses point forward and outward in a greater degree ; 
their zygapophysial articulations are larger and present a 
more obliquely concave appearance than in the later genus, 
while the postzygapophyses are quite similar in every re- 
spect. The neural spine is robust and high, but on the 
whole proportionally lighter than in Canis. The excaya- 
tions on the spine referred to in the description of the pre- 
ceding vertebra are also continued to the dorsal series, and 
in his description of Daphenus (I. ¢., p. 389) Scott speaks of 
this condition as follows: “the notch between them [prezy- 
gapophyses] is very deeply incised, invading the base of the spine, a very different 
arrangement from that seen in Canis.” 
Fia. 12. First Dorsal of D. 
superbus. 4 nat. size. 
MEASUREMENTS OF First DorSAL VERTEBRA. 
Mm. 
Antero-posterior diameter of the centrum. 25 
? Transverse diameter of the centrum Sets 29) 
i Vertioal'diaméten of the conmtrumy, sevsss10.ciceccctheeesecdsecsccccsent ess ae 4s) 
Transverse diameter across the transverse processes. 63 
Transverse diameter across prezygapophyses..... . 45 
Transverse diameter across postzygapophyses... . 30 
HLei gh tOLUMUrAl ADUNOwees.svvscesseiecWriesnteeteceegr cc rte lns es RA Re A lee nce - 60 
Second Dorsal Vertebra.—The centrum of the second dorsal is less depressed 
than that of the first, its anterior face being of more 
nearly circular outline and quite convex. Ventrally 
there are two prominent ridges on either side of the 
median keel, which extend nearly the entire length 
of the centrum. The transverse process and the 
zygapophyses are lighter than on the preceding verte- 
bra. The prezygapophyses face inward and slightly 
upward; at their lower margins they are abruptly 
Fra. 13. Lateral and Posterior Views Concave, due to sharp ridges at their bases which ex- 
of Second Dorsal of D. superdus. gnat. tend diagonally upward and inward, uniting with 
baie the anterior border of the neural spine a short dis- 
tance above the arch. ‘The triangular area on the anterior face of the spine, which 
is bounded laterally by these ridges, is quite deep and has a rugose surface identi- 
