NEKBASKA GEOLOGICAL SURVEY 



sible to state that there is enough of the skeleton in evidence to 

 make a restoration of the animal possible. Awaiting the prepara- 

 tion of the various skeletal parts it seems to be in order to offer a 

 brief description of the skull and mandible, accompanied by a half 

 tone reproduction. 



In general it may be stated that the skull, which is almost with- 

 out break or blemish of any kind, is that of a primitive, "four- 

 horned antelope" with wide orbits, tapering snout, and a well pro- 

 portioned outline presaging a beast of grace and beauty equal to 

 thai of any living or extinct species. 



The skull, which is that of an old animal, with sutures obliter- 

 ated and teetli ground down, is decorated with four conspicuous 

 horn cores, which in each case are grooved like those of the Bovi- 

 dae. These horns constitute the first and most striking character- 

 istic of the genus. The posterior or frontal pair curves upward 

 and inward, while the anterior or maxillary pair curves upward 

 and outward. 



The writer would propose the name Syndyoceras for this genus, 

 in allusion to the two pairs of horns. In addition to meaning two 

 pairs sunduo in Greek has as a primary meaning two together, 

 which is quite descriptive of the front horns, for they have fused 

 and stand on a common trunk. 



I^ext to the horn cores the most striking feature seems to be n 

 nasal opening, of circular outline, just back of the anterior horns. 

 The margins are roughened as though for ligamentous attachment, 

 which suggests the possibility that it was functional. A parallel 

 may be drawn here with Protoceras, in which, if the anterior horns 

 or protuberances were enlarged, the nasal opening could easily be 

 divided into two parts. 



Another anatomical feature, interesting, though not unique, is 

 found in the canine and first premolar on each side. The canine 

 has migrated forward and has become incisiform functionally, 

 while the first premolar has taken its place and has become canini- 

 form in function. 



