BULLETIN FLORIDA STATE MUSEUM


L.F. of Scurry County, Texas. They stated that (1973:34): "The new
form is intermediate in most respects between the middle Pliocene
(Hemphillian) Nannippus lenticularis and N. phlegon of the latest
Pliocene and earliest Pleistocene, with some distinctive characters of
its own." Despite the conclusion that "Nannippus" lenticularis is
closely related to both N. phlegon and N. beckensis, Dalquest and
Donovan presented important information with regard to the present
study that supports a close relationship among N. minor, N. beckensis,
and N. phlegon.
 In most hipparions the anterior regions of both P2 and P2 are ex-
panded. In the P2 this expansion includes the presence of a
pseudoparastyle and true parastyle (Fig. 3). In the P2 the paralophid
usually exhibits a triangular anterior projection. In N. minor, N.
beckensis, and N. phlegon the anterior regions of both P2 and P2 are
unexpanded relative to other hipparions (compare Fig. 17 with Fig. 4,
also see Dalquest and Donovan 1973:38, text-fig. 4B).

TABLE 11.-MEASUREMENTS OF Nannippus minor, NEOTYPE, UF 17570, FROM PAL-
 METTO MINE IN THE BONE VALLEY DISTRICT, POLK COUNTY, FLORIDA.
 AP T
Tooth Length Width Ht*
LP3 16.1 15.3 28.9
LP' 15.6 15.0 32.8
LM' 14.0 13.7 27.8
LM2 14.3 13.7 31.7
LM3 12.8 9.7 31.5
RM2 14.7 13.5 32.3
RM3 13.0 9.3 31.9
Length LP3-LM3:72.1
*Greatest crown height (see Table 1).


0 1 2 3 4 5cm
 II I III


FIGURE 15.-Left upper cheek tooth row, P3-M3, of Nannippus minor, UF 17570,
neotype, from Palmetto Mine, Bone Valley district, Polk County, Florida. (Remainder
of neotype, M'-M3, not illustrated here.)


Vol. 25, No. 1