4 Field Columbian Museum — Zoology, Vol. III. 



lengthened pointed spur; while the lacrymal is wide for its length. 

 The parietals are considerably depressed at the posterior base of the 

 horn cores, forming two pits, and the interparietal is nearly straight 

 anteriorly and entirely without the central point so conspicuous in the 

 skulls of the Rocky Mountain goats. A considerable portion of the 

 occipital region has been cut away, evidently to facilitate the removal 

 of the brain. On the inferior surface, the basioccipital is almost 

 square, slightly contracted midway. The "lips" of the foramen 

 magnum between the occipital condyles have also been cut away. The 

 basisphenoid is greatly contracted and very narrow for most of its 

 length, and the visible portion of the presphenoid terminates almost 

 in a point. The pterygoid fossa is wide for its entire length, and the 

 palatal arch has a blunt median azygos process. 



Interparietals. 



O. Kennedy!. O. montanus. 



The mandible has a broad, flat condyle, and a rounded angle pro- 

 jecting outward nearly on a line with outer edge of condyle; the hori- 

 zontal portion slender, with only a slight curve to the inferior out- 

 line. Coronoid process long, narrow, curving gradually backward. 



The horns commence to curve outward from the base, turning 

 backwards at the tips, rather strongly ribbed for half their length and 

 smooth for the remaining portion. 



Measurements. Skull: Occipito-nasal length, 273 mm. ; anterior 

 edge of foramen magnum to anterior end of premaxillaries, 243; inter- 

 orbital width, 75; length of frontal, 82; of nasals, 99; greatest width 

 of nasals, 30; mastoid breadth, 79; zygomatic width, 102; width of 

 palate between second molars, 46; length of incisive foramen, 40; 

 height of horn core, 74; length of mandible from angle to symphasis, 

 217; of coronoid process, 44. Total length of horns along curve, 244; 

 around base, 108; tip to tip, 303; this last nearly twice that of widest 

 measurement on record. 



The differences exhibited between the skull of this specimen and 

 those of the Rocky Mountain goat with which it has been compared 



