Vol. 5] Merriam. — Strepsicerine Antelopes from Nevada. 323 



Fig. 4. — Ilingoceros alexandrae. Outer side of left horn core and orbital 

 region; a, spiral ridge originating over postero-superior region of orbit. No. 

 11880, type specimen, natural size. 



Fig. 5. — Ilingoceros alexandrae? Outer side of left horn core and orbital 

 region; a, spiral ridge originating over postero-superior region of orbit; 6s, 

 cross-section of horn core. No. 11894, natural size. 



Fig. 6. — Ilingoceros, form C. Outer side of right horn core ; a, spiral 

 ridge originating from postero-superior region of the orbit, and presumably 

 connected with the postorbital process; 6s, cross-section of horn core. No. 

 1189.3, natural size. 



