O. C. Marsh—New Vertebrate Fossils. 253 
horns. The type specimen has its greatest and least diameters 
near the base, 140™™ and 110™™. t a distance of 300™™ 
further toward the end, the diameters are 100" and 90™". 
The radius of the inner curvature, except for the last 150" 
of the length, was 350™™. 
The discovery of these two lower Pliocene species of Bison, 
suggests the probability that this form is a New World type, 
although it has generally been credited to the other hemisphere. 
Allomys nitens, gen. et sp. DOV. 
Among the Upper Miocene mammals, a peculiar genus is 
found, which is probably related to the flying squirrels, but 
the teeth are somewhat like those of Ungulates. Its affinities 
are evidently with the Rodents, however, and it represents a 
distinct family, the Allomyide. The general characters of 
the upper molar teeth are shown in the accompanying figure, 
which is six times natural size. The animals of this species 
are all very small, hardly larger than a rat. The extent of 
three molar teeth is 8™. The transverse distance between the 
two series is, in front, 3°8"™, and posteriorly, 4°4™™. 
‘The known remains of this species are all from the Upper 
Miocene of Oregon. 
Graculavus lentus, sp. nov. 
The Cretaceous deposits of the Atlantic coast and of Kansas 
have hitherto alone yielded remains of Birds, but these have 
recently been found in beds of the same age in Texas. The 
most characteristic specimen obtained is the distal end of a 
metatarsal, which differs from the corresponding bone of the 
toothed birds from Kansas, and may be referred provisionally 
to the genus Graculavus, the type of which is from the Upper 
Cretaceous of New Jersey. This specimen shows that there 
were three toes of nearly equal size, and also a hallux raised 
above the main digits. 
Transverse diameter of shaft of tarsometatarsal bone. 4:2" 
Vertical. diameter-of same << 1.0.0.) us. seedeseuds 3°6 
Transverse diameter across distal articular faces-. -- - 10° 
Vertical diameter of median distal articular face ..-- 48 
The known remains of this species indicate a bird about as 
large as a small duck. 
mm 
