CREODONTA. 
113 
premolars are destitute, or have but a trace, of external basal cingulum. 
A narrow basal ledge connects the internal heel of the fourth with its anterior 
basal tubercle. There is an external basal cingulum on the first and second 
true molars, but none on the base of the internal heel. An angular tubercle 
stands between that of the internal heel and the anterior one of the central 
pair, on the first and second true molars. The V-shaped shear which works 
against that of the antero-external side of the inferior tubercular sectorials 
is formed by the posterior of the two median cones and the short blade of 
the posterior external heel. The last and transverse molar has a median cusp 
and small internal heel. A fragment of a lower jaw of a small Mammal of 
similar size accompanied the cranium, which was supposed to belong to the 
same animal when I first described this species. Additional specimens of 
other species of the genus have led me to the conclusion that this fragment 
belongs to a different genus, and was accidentally introduced among the 
remains of S. viverrinus. 
Measurements. 
Length of the last five molars.. 
Length of the true-molar series. 
Length of the last premolar. 
Width of the same. 
Length of the penultimate molar . 
Width of the same. . 
Width of the last molar. 
M. 
0. 0250 
0. 0135 
0.0000 
0. 0050 
0.0050 
0. 0068 
0.0047 
A cervical vertebra is not shortened, and the centrum is depressed 
and one-third longer than wide behind. The anterior lumbars are less 
depressed, and the centra are marked below by a median protuberance in 
front, and an infero-lateral tuberosity on each side, causing the existence 
of a subtriangular, irregularly flattened area on the anterior two-thirds of 
the inferior surface. The superior face of the neural arch is grooved above 
in continuation of the emargination between the posterior zygapophyses. 
The spine only rises from the position of a keel between the anterior 
zygapophyses, where it has a small basis directed forward. A lumbar from 
a more posterior position has a median keel-like angle dividing the inferior 
aspect of the centrum. On the sacrum, the neural sj^ines and zygapoph 3 "ses 
are indicated by longitudinal and oblique ridges. The centrum is depressed 
at the anterior extremity. The transverse processes are massive but not 
8 G R 
