VERTEBRATES FROM MIOCENE, PLIOCENE AND PLEISTOCENE. 89 
upper molars, one and two. The species appears to be rather close 
to some of the species of Mesocyon from the John Day beds and is 
referred provisionally to that genus. When compared to M. cory¬ 
phaeus it is seen that the sectorial is placed in the jaw at approxi¬ 
mately the same angle. The deuterocone, however, is more closely 
appressed. The Florida specimen indicates a dog somewhat larger 
than M. coryphaeus. 
As compared to Cyuodcsmus thooides from the lower John Day 
beds this species differs in the sectorial tooth. The duterocone in 
particular adheres much more closely to the tooth. The sectorial 
is also better adapted as a cutting tooth being thinner and directed 
inward at a sharper angle. The two posterior molars, however, 
are very similar to those of C. thooides, although slightly smaller. 
The angulation between the molar-premolar series is perhaps more 
pronounced than in C. thooides. This species may be known as 
Mesocyon ? iamonensis. The type specimen is No. 5082 of the 
Florida Geol. Survey collection. 
CAMELIDAE. 
OXYDACTYLUS? SP. 
PI. II, fig. 4. 
A small camel is represented in the collection from the Griscom 
plantation by one complete tooth and by several tooth fragments 
and by the proximal and distal ends of a cannon bone. The same 
species is perhaps represented by tooth fragments and by three as¬ 
tragali from the fuller’s earth mine at Midway. Although broad, 
the cheek teeth are low crowned, and the species is provisionally 
referred to the genus Oxydactylus. The dimensions of an unworn 
cheek tooth, Fla. Surv. coll. No. 5.073, are as follows: Greatest 
anteroposterior width 21 mm.; greatest transverse width 17 mm.; 
greatest height of unworn crown 11 mm. Associated with this 
tooth are two premolars which probably belong to the same animal. 
The anteroposterior measurement of the larger of the two premo¬ 
lars is 10 mm. 
HYPERTRAGULIDAE. 
LEPTOMERYX? SP. 
PI. II, fig. 2. 
The small deer-like animal, Leptomeryx, so abundant in the 
White River beds of the west is apparently represented by a single 
astragalus, Fla. Surv. coll. No. 5097. Direct comparison of this 
