292 



University of California Publications. 



[Geology 



general relationship fairly close when better specimens of 

 Sphenophalos become available. 



ILINGOCEROS SCHIZOCERAS, n. sp. 



Type specimen a complete horn-core, no. 11893, Univ. Calif. 

 Col. Vert. Palae. .From the Thousand Creek Beds at Thousand 

 Creek, Humboldt County, Nevada. 



In the first description of the genus Ilingoceros, two types 

 of horn-cores of uncertain specific position were referred to this 

 group as forms B and C. The specimen on which form C was 

 based lacked the distal portion of the horn-core, as was shown 

 in figure six of the original publication.- 8 Since this paper was 

 issued the terminal portion of this horn-core has been found in 

 a small collection made only a few yards from the spot at which 

 the type of form C was collected. The two fractured faces fit 

 together perfectly and there is no possible doubt as to their 

 representing the same horn-core. 



Horn-Core. — As shown in figures 73a and 736, the portion 

 now added to the original specimen carries the horn upward with 

 the same spiral twist and flattened cross-section shown in the 

 lower portion already described. The upper end of the horn, 

 instead of narrowing to a point as in typical antelopes, is wid- 

 ened slightly and is deeply notched so that it ends in two dis- 

 tinct prongs. The terminations of the prongs are obtuse, and 

 consist of much more spongy tissue than the rest of the horn. 



The type of horn shown here is quite distinct from that of 

 any form previously described. While the basal portion 

 resembles that of the strepsicerine antelopes, the terminal region 

 suggests the divided horns of certain forms of Merycodus. There 

 is no suggestion of a burr on the horn, and since the terminal 

 portion of the core is slightly wider than the middle region a 

 sheath horn could not have been shed without splitting. - 



If this horn-core represents a young animal, it may possibly 

 belong to one of the forms referred to Ilingoceros alexandrae. 

 It was, however, associated with numerous remains of evident 

 adults of a form much smaller than I. alexandrae. Under the 



asMerriam, J. C, Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, p. 323, 

 fig. 6, 1909. 



