444 RICHARD S. LULL 



less, are preserved, together with thirteen ribs. The lumbar, sacral, 

 and caudal vertebra? are missing. Of the fore-limbs the proximal 

 end of the left and the distal end of the right scapular are preserved, 

 together with the distal ends of both humeri and the proximal end of 

 the right. 



The radius and ulna of the left limb and fragments of the right 

 ulna represent the second segment ; while of the manus all the bones 

 of the right, except the pisiform, the trapezoid, and a few phalanges, 

 are preserved, the left being less perfect, but supplementing the first 

 so that, with the exception of a part of the humerus, our knowledge 

 of the entire limb is complete. 



The hind limbs are more complete, as both fermora, tibiae, and 

 fibulas are preserved most admirably. Of the pes, that of the left 

 limb is perfect as to the tarsus, while the right lacks only the ecto- 

 cuneiform, that of another specimen being substituted in the mount. 

 Both metatarsi are perfect, though several phalanges are missing. 

 A number of sesamoids of both manus and pes are preserved, together 

 with the left patella. 



With the exception of the vertebral spines, the bones are for the 

 most part in admirable condition, though the skull and jaws have been 

 subjected to a peculiar shearing strain, which has brought the left 

 side in advance of the right, as shown in the figures. 



DETERMINATION OF THE SPECIES 



The specimen under consideration is evidently a Megacerops, as 

 the generic characters given by Osborn 1 and by Marsh 2 are well 

 marked. The skull is moderately brachycephalic, with expanded 

 zygomata; the horns are rather short, without a prominent connect- 

 ing-crest, oval at the summit and transversely elongate oval at the 

 base. The nasals are of moderate length, with well-rounded extremi- 

 ties. The dental formula is I.f ; c.\; p.-f-; m.|; the two median 

 superior and all of the lower incisors being represented by deep 

 unclosed sockets, as though the teeth had been lost after death. 

 There is a diastema behind the canines, and the internal premolar 

 cingulum is less pronounced in the center of the tooth. 



1 H. F. Osborn, Bulletin of the American Museum oj Natural History, Vol. XVI 

 (1902), Art. VIII, p. 96. 



2 O. C. Marsh, American Journal 0} Science (3), Vol. XI (.1875), p. 245. 



