1980 MACFADDEN & WALDROP: FLORIDA NANNIPPUS PHLEGON 9


horses resulting in a triangular outline for this tooth. However this
area is not well developed in N. phlegon. In P2-M3 the parastyle and

TABLE 1.-MEASUREMENTS OF ISOLATED UPPER CHEEK TEETH OF Nannippus phlegon
 FROM FLORIDA.

 AP* T HT
Specimen Tooth length width t
UF 22617 R P2 19.5 15.0 >40.6
UF 22621 RdP3 or dP' 26.6 11.3 -
TRO 553 RdP3 or dP4 21.4 12.6 -
UF 22614 R P3 or P4 18.0 16.4 51.0
TRO 554 R P3 or P4 17.2 17.3 35.9
UF 22611 R M' or M2 16.3 14.9 59.1
UF 11888b M3 15.6 12.2 55.4
TRO 546 R M' or M2 16.1 15.3 55.7
TRO 543 M3 16.7 13.4 28.3
UF 11887 R upper 15.4 15.6 -
UF 22629 LdP2 24.9 12.6 -
UF 22609 LdP2 24.4 13.3
UF 22607 LdP3 or dP4 20.5 11.1 -
UF 22634 ?LdP3 or dP' 14.4 15.9 24.4
UF 22613 ?LdP3 or dP4 12.8 14.7 21.4
UF 22610 LP2 or P3 19.7 14.7 42.1
UF 11888a LP3 or P' 17.6 17.2 42.6
UF 1143 LP3 or P4 20.0 17.5 >46.3
UF 22616 LP3 or P4 18.5 15.5 55.0
UF 10810 LM' or M2 17.1 16.4 55.8
UF 22615 LM' or M2 17.9 14.1 62.8
TRO 545 LM' or M2 17.0 13.7 66.0
USNM 214820 LM' or M2 16.2 15.6 48.5
UF 7380 L upper 19.5 58.3:
UF 21327 L upper 19.1 12.9 >54.9
UF 22627 L upper 17.0 14.3 22.2
UF 17484 L upper 17.3 19.9 24.9
*Anteroposterior length and transverse width measurements include cement.
tGreatest crown height measured from mesostyle to base of longest root. Maximum measurements indicate speci-
mens in very early wear stages.
$Measurement approximate.


TABLE 2.-MEASUREMENTS OF UPPER DECIDUOUS DENTITIONS OF Nannippus phlegon
 FROM MT. BLANCO, TEXAS.
 dP2 dP3 dP' M' M2 M3
 AP T AP T AP T AP T AP T AP T
AMNH 104708
 Right 23.8 15.3 20.1 16.0 21.3 16.4 20.1 16.5 -
 Left 24.2 15.3 20.5 15.9 19.8 16.3 19.8 15.0* - -
AMNH 104709
 Right 24.2 15.2 21.8 15.2 22.5 14.4 -
 Left 23.8 15.2 20.6 15.3 22.3 14.4 -
 *Measurement approximate.