A NEW FOSSIL MAMMAL 



Dental formula : I. h C. {, P. |, M. f. 



Measurements of the skull: Length of skull 12% inches (325 

 mm). 



Distance between the orbits across the frontals, 5 inches 

 (128 mm). 



Elevation of the anterior horn cores above plane of molars, 

 6!/2 inches (166 mm). 



Spread of same at the summit, 8V2 inches (216 mm). 



Height of posterior horn cores above plane of molars, 7«% 

 inches (197 mm). 



Spread of same at widest point, 10 inches (251 mm). 



Width of palate between molars, 1*4 inches (32 mm). 

 The known skeletal parts of Syndyoceras are the following: 

 Skull and mandible complete : vertebral series complete, as far as 

 exposed, and articulated : pelvis and sacrum and both hind limbs 

 complete and likewise articulated : several ribs, attached to their 

 respective vertebrae above and to the sternum below, are in view ; 

 and a portion of one scapula. The fore limbs are apparently miss- 

 ing but will doubtless be found either in the material collected or 

 else in the quarry. Each hind foot has two toes, and it now remains 

 to find the fore foot to settle doubts as to whether it also had two 

 toes, or two with a rudimentary pair of toes, or four functional 

 toes, after the manner of the ancestral antelopes. 



The cervical vertebrae are noticeably large and broad, but short. 

 The horn cores are roughened and grooved as in the Bovidae, but 

 the horns were no doubt very like those of our common prong-horn 

 antelope, and were probably shed annually. 



In size it was about intermediate between a common sheep and 

 the antelope. 



Approximate measurements of hind limb: 



Length of femur, 8% inches (222 mm). 



Diameter of shaft, % inch (24 mm). 



Length of tibia, O 1 /^ inches (212 mm). 



Length of tarsus, about 2 inches (51 mm). 



Length of metatarsus, 5 inches (128 mm). 



Length of first phalanx, 1% inches (45 mm). 



