VERTEBRATES FROM MIOCENE, PLIOCENE AND PLEISTOCENE. 83 
DESCRIPTION OF SPECIES. 
EQUIDAE. 
PARAHIPPUS LEONENSIS, SP. NOV. 
PI. ir, figs. 3, 6-9, and 12. 
Among the fossils from the Griscom plantation is a horse rep¬ 
resented by a permanent tooth from the right upper jaw, probably 
M 1 , two lower cheek teeth, an astragalus and a first median and a 
first lateral phalanx. This horse is referred to the genus Parcihip- 
pus and to the new species P. leonensis. A horse, probably the 
same species, is represented in the collection from the fuller’s earth 
mine at Midway by a right astragalus, a second phalanx, a prox¬ 
imal part of a metacarpal, and a fragment of a tooth. The tooth 
from the upper jaw, Florida Survey collection No. 5084, is selected 
as the type of the species. 
The tooth selected as the type is but little worn and serves well 
to show the characters of the species. The exterior margin is 
marked by a prominent median rib. The metaloph is fully con¬ 
nected, with the ectoloph. From the anterior wall of the metaloph 
a complex fold reaches across and touches or almost touches the 
posterior wall of the protoloph thus forming a well marked crochet. 
The prefossette is closed or nearly so by the crochet. The post- 
fossette is also' closed by the large hypostyle, the walls of which 
show complex folding. The protocone is large, oval and slightly 
elongated anteroposteriorly. The hypocone although not so large 
as the protocone, is prominent and is noticeably elongated antero¬ 
posteriorly.- The inner walls of the protocone and hypocone are not 
abrupt but are sloping. The protoeonule is compressed and tends 
to assume a cresentic position; it is separated from the protocone 
by a constriction formed chiefly by a fold in the anterior wall of 
the protoloph. The metaconule is separated from the hypocone by 
a less pronounced constriction than that which separates the proto- 
conule -from the protocone. A light cingulum borders the depres¬ 
sion which separates the protocone and the protoeonule. A light 
coating of cement is seen in the inner median valley. 
MEASUREMENTS. 
Anteroposterior diameter of tootfi, probably m 1 _ 16mm 
Transverse diameter, at base_’___.•_19mm 
Transverse diameter from summit median ridge to inner margin_15mm 
Height of crown, tooth but slightly worn_ 13.5mm 
