1980 MACFADDEN & WALDROP: FLORIDA NANNIPPUS PHLEGON 27

TABLE 10.-MEASUREMENTS OF PHALANGES OF MEDIAL (III) METAPODIALS FOR
 Nannippus phlegon FROM FLORIDA.
 Width Width Length Length
 prox. art. dist. art. V-cscar V-scar/length
Specimen Length surface surface first phalanx first phalanx
UF 7427
 First phalanx 52.5 25.6 20.5 41.7 .79
UF 22632
 First phalanx 54.2 27.0 21.4 42.7 .79
UF 10695
 Second phalanx 29.7 23.7 22.1-

 The volar, or plantar, surface of the first phalanx bears a complex
of scars that serve as attachments for the digital ligaments. During
the course of equid evolution the length of the V-scar (Fig. 13) increas-
ed greatly relative to the length of the phalanx. Sondaar (1968) stated
that in advanced horses this scar extends about 1/2 the length of the
phalanx in N. phlegon and "primitive" Equus (Dolichohippus) and
about 2/3 the length of the phalanx in "advanced" Equus. (Figures of
Equus in Camp and Smith [1942:100] and Sondaar [1968:36] suggest
that the V-scar extends far more than 2/3 the length of the phalanx,
but as Camp and Smith noted, it is indeed difficult to delimit the distal
extent of this scar.) Based on the two UF specimens of Florida N.
phlegon (Table 10), the V-scar extends for more than 3/4 the length
(.79) of the phalanx. Lateral to the distal apex of the V-scar are two
well-developed oval perforatus scars (Fig 13B, b).
 The second medial phalanx is represented by one specimen, UF
10695. As in other three-toed horses, the length of this phalanx ex-
ceeds the width, whereas the reverse is true in one-toed horses (Table
10, Hussain 1975).

 DISCUSSION
 Nannippus phlegon FROM FLORIDA.-In size, degree of hypsodonty,
and dental pattern the Florida N. phlegon specimens resemble the
topotypic material from Mt. Blanco. The Florida sample is also com-
parable to published descriptions of this species from other localities
(Hibbard 1941, 1956, Gazin 1942, Dalquest 1975). Prior to this study
N. phlegon was reported from only two localities in Florida, Haile
XVA (Robertson 1976) and Santa Fe River (Webb 1974). Two addi-
tional localities are now known, Sarasota and Port Charlotte.
 Evidently this horse was not rare in Florida, and its apparent scar-
city reflected the meager sample of appropriate age. With its northern-
most occurrence in Nebraska (Skinner and Hibbard 1972), N. phlegon