Hay — Tiro New Ruminants from fJir Pleistocene of Iowa. 7 



to identify them. In their present state there is no bone which connects 

 the two masses representing the specimen ; but they were probably con- 

 nected as they lit y in the gravel of the pit in which they were found. If 

 the small piece of bone which is missing were present, many doubts would 



he dispelled. 



Besides the horn-cores themselves a considerable part of each of the 

 supporting frontal hones is present, including a considerable part of the 

 brain-case. A small part of the distal end of the left core is missing, and 

 still more of the right one. 



A ntero-posterior diameter at base of horn -core 75 mm. 



Transverse diameter at base of horn-core 57 " 



I Greatest diameter of horn-core at 35 mm. from broken end . . 51 " 



Diameter at right angles to this 40 " 



In cross-section the cores are nearly flat on the mesial face, strongly 

 convex on the outer face. Hinder border much hroader than the an- 

 terior. Cores strongly bent, so that the axis of the terminal half is at 

 nearly right angles with that of the proximal half and of the pedicel. 

 Distal portion of the core nearly straight, as seen from without; turned 

 somewhat mesially, as seen from above. Surface rough with grooves and 

 pits for blood-vessels. Frontal bone occupied by large sinuses, which 

 extend into the base of the horn-core, but not to the middle of its length. 



The affinities of this animal are believed to have been with the goats. 



This species is dedicated to the late Prof. Samuel Calvin, an enthusi- 

 astic investigator of the geology and the paleontology of the Pleistocene 

 of Iowa. 



