1893.] Geology and Paleontology. 897 
external incisors are oblique, and slightly incurved ; they have robust 
cutting edges, which are finely serrate, and no basal lobes. The incis- 
ors 1 and 2 have small conic lobes at the base of the crown, which are 
well separated from each other at their bases. Those of I. 1 are sub- 
equal, while the external of I. 2 is smaller than the internal, and 
nearer the base of the crown. The crowns proper of 1 and 2 are 
acutely conie with semicircular section, the posterior face being flat. 
The edges of I. 2 are feebly crenate; those of I. 1 are smooth. 
The metacarpals represented are II, IV and V ; of these No. IV is 
best preserved. — It differs from that of the lion in the smaller trans- 
verse diameter of the head, and in the fact that the superior face of 
the diaclast! is nearly continuous with the proximal or unciform 
surface. The shaft is quite as robust as that of the lion. The shaft of 
the fifth metacarpal is on the contrary moreslender. Its section is a 
triangle with convex limbs, and the obtuse apex external. The pha- 
langes have forms and proportions similar to those of the fifth digit 
of the lion. The second phalange is a little shorter, and the 
margins display but small traces of the bases of the sheath, which has 
been broken off. Otherwise the ungual phalange resembles that of 
the lion. 
Measurements. mm. 
Diameters crown I. 3 i nee HM 
; ( longitudinal, 80 
Diameters crown superior canine + anteroposterior, 28 
transverse at base, 12 
anteroposterior, me 
; j cone, 
Diameters superior carnassial es f PUN _ ds 
Transverse diameter of head of femur, ; 40 
Diameters head MC. IV, f Pu (restored), z: 
Transverse diameter shaft MC. IV at middle, 16 
Anteroposterior diameter shaft MC. IV at middle, 11 
Length of phalange ? V 1, 38 
wc Oe “ 1y ^ i 94 
i£ ER sé ? Vv 8, 2 
This species, which I propose to call Dinobastis serus, increases 
the number of our Plistocene Felidx to four. The three other species 
are Smilodon fatalis Leidy, S. gracilis Cope, and Felis atrox Leidy. — . 
! For the explanation of this term see the Annual Report of the Geological 
Survey of Texas, 1892, Report on Vertebrate Paleontology of the Llano Estacado, 
p. 55. 
