PETERSON : NEW CARNIVORES FROM MIOCENE OF WESTERN NEBRASKA 223 
processes decrease but very slightly from the fifth to the ninth, the articular sur- 
faces for the ribs are extensive on the free and expanded ends, but the excessory 
processes on the superior faces, which are so prominent in the recent dogs, are very 
inconspicuously developed. The neural spines in the whole series are heavy, but 
gradually reduced in height in proceeding backward, the ninth being quite thin 
transversely though broad antero-posteriorly. 
MEASUREMENTS OF FirrH AND NINTH DorSsAL VERTEBRA. 
Dede S00 
Mm. Mn. 
Antero-posterior CiaMeter: OF CODETEY << ctsor skeoces conn co te wivseb Ay aasltetauerats vPeuwontaness yes (eel 24 25 
Transverse diameter of centra... 26 
Vertical diameter of centra ...... Ae. 
Transverse diameter at transverse processes. 47 
Plsigh ut netitel: PGineticcstinss cisivcod vacessdovesinveass Dm eaet pene Nats gs cibeaadiocbel ort canara Cerne 60 43 
Tenth Dorsal Vertebra.—The centrum of the tenth dorsal vertebra is similar to 
that of the ninth, with the exception of the absence of facets for the capitulum of 
the rib. The transverse process is still quite heavy and has a large facet for the 
tuberculum of the rib, as is well shown in Fig. 16. The prezy- 
gapophysis is like that in the preceding vertebra, while the 
postzygapophysis is placed high and faces downward and out- 
ward, similarly to that in the recent dogs. The neural spine, 
however, is very characteristic in the present genus and differ- 
ent from that in the recent form. In Canis lwpus the spine is 
thin transversely, quite broad antero-posteriorly, very low and Fic. 16. Tenth Dorsal 
of D. superbus. 3 nat. size. 
upright in position—a character which was apparently 
already established in some of the early tertiary forms (Miacidz). In Daphanodon 
superbus the neural spine of this vertebra is more backwardly inclined, and, with 
the exception of the postzygapophysis and the sudden reduction in size, it is like 
that in the true dorsals. In Canis latrans the neural spine of the tenth dorsal is ap- 
parently quite similar to the one here described, though much shorter in proportion. 
MEASUREMENTS OF TENTH DoRSAL VERTEBRA. 
Mm. 
AHLELO- POSLEML OL AIATMELOR-Of GOL GEIL sees Ween coh PL AUER can aN TMK SESE Ms dd OPE IS ER UOC EE A Saubsee ENT Seen ARES 25 
Transverse diameter of centrum, posteriorly. » 25 
Vertical diameter of centrum . 16 
rans verde, diameter ab: transverse Proceseesivitesc.ua.ssatess sutpadesssecetee \ssues seus tsebeeudesattustesaducveeins 47 
Height of neural’ spine,ap proximately avwcererathe. aw cesserweccton tees coveh Nias ool Voc Oa yeeein ved Teal ees caters 35 
8 Matthew, W. D., ‘‘ Carnivora and Insectivora of the Bridger Basin,’’ Memoirs Amer. Mus. Nat. Hist., Vol. 
TX., p. 367, 1909. 
