420 Zoological Society. 



Oryx. 



A suborbital fissure, but no fossa, the masseteric ridge not extend- 

 ing high ; the auditory bulla large and compressed ; the basioccipital 

 bone with its tubercles well- developed ; the molars with supplemental 

 lobes. 



Horns straight or gently curved, annulated, placed in a line with 

 the face. 



Hab. Africa. 



O. gazella. O. leucoryx. 



It is only in Mr. Cumming's collection that I have seen entire skulls 

 of the Gemsbok, and the lower jaw being absent, I could not ascer- 

 tain the character of the incisors. The skull of the Leucoryx I have 

 not seen. 



Addax. 



A small suborbital fissure, but no fossa ; the masseteric ridge 

 ascending before the orbit ; the auditory bulla large, prominent, and 

 compressed ; the basioccipital bone with its anterior pair of tubercles 

 slightly, the posterior well, developed ; the median incisors expanded 

 at their summits ; the molars with supplemental lobes. 



Horns nearly in a line with the face, annulated, spirally twisted. 



Hab. Africa. 



A. naso-maculata. I have seen but one skull of this animal, and 

 that is a young one, in the Society's collection, still retaining the 

 whole of its milk dentition. 



Before proceeding to the Sheep and Goats, the Nyl-Ghau requires 

 to be introduced. It seems to stand alone, not having a decided 

 affinity for any other genus. 



PORTAX. 



The nasal opening rather small, with the nasal bones small and 

 narrow ; a minute suborbital fissure ; no fossa, but a smooth line 

 upon the lacrymal bone ; the masseteric ridge not extending high ; 

 the auditory bulla moderate, bulbous, compressed ; the basioccipital 

 bone with the posterior tubercles moderately developed, the anterior 

 ones scarcely at all ; the molars with supplemental lobes. 



Horns short, round, vertical, slightly bent forwards. 



Hab. India. 



P. picta. — The only skull that I have seen (that in the British 

 Museum) wants the incisor teeth, so that I could not ascertain their 

 structure. The smooth line upon the lacrymal bone terminates in a 

 small foramen, but on one side is continued for some distance for- 

 wards upon the maxillary bone, where it terminates in the same way ; 

 and it may even be faintly traced on the other side for some distance 

 beyond the foramen. 



Capra. 



A small suborbital fissure, no fossa ; the masseteric ridge ascending 

 Jhigh before the orbit ; the auditory bulla prominent and compressed ; 



