ments, apparently from other parts of the skeleton. All are in 
an excellent state of preservation, and part of them are so 
characteristic that they clearly indicate the near affinities of 
the animal to which they belonged. 
he ungual or hoof-phalanx differs in form from that of the 
recent horse only in being somewhat more depressed, and in 
having the sides of the upper surface slightly less convex trans- 
versely, and the beak of the articular face a little less pointed. 
Its length measured along the axis is very nearly one inch, the 
shorter diameter of the articular face is five lines, and the lon- 
ger, or transverse, ten lines, The coronary, or middle phalanx, 
as the ossification of the various bones clearly proves. Ad- 
ditional parts of the skeleton, especially the teeth, would per- 
aps show generic characters different from those of the living 
horse, but in the absence of these, as the remains are evidently 
distinct from any hitherto described, the species may be named 
Equus parvulus, This makes seventeen species of fossil horses 
now known to have lived in North America, although until 
quite recently it was very generally believed that there was none 
indigenous to the continent. a 
the bones above described occur in a stratum of gray arena- 
ceous clay, lying nearly horizontally, and apparently of later 
ertiary age. The large number of vertebrate remains found 
Yale College, Oct. 5th, 1868. ” 
