539 



3215. The lower jaw of a Zebra (Equm Zebra). 



The rami diverge as they recede from the symphysis, more than in the Quagga, and the 

 coalesced symphysis is longer and narrower. 



Presented by Mr. Cross. 



3216. The skeleton of an Ass (Equus Asinus). 



The vertebral formula is: 7 cervical, 18 dorsal, 5 lumbar, 5 sacral: 11 caudal vertebrae 

 are preserved. 



Hunterian. 



3217. The skull of an Ass (Equus Asinus). 



The last upper molars are relatively smaller than in the Horse, especially in the size of 

 their posterior lobe, and the same is observable, but in a somewhat less degree, with regard 

 to the last lower molars. The form and extent of the posterior emargination of the bony 

 palate resemble those in the Horse. The lower jaw in this specimen presents a deep and 

 well-marked fossa above the hinder part of the anchylosed symphysis, of which there is no 

 trace in the Horse or Quagga. 



Hunterian. 



3218. The skull of a young Ass (Equus Asinus). 



The incisors, canines, last premolars, and last true molars of the permanent series, have 

 not been acquired. 



Presented by William Clift, Esq., F.R.S. 



3219. The symphysis of the lower jaw of a young Ass. 



The two middle permanent and four lateral deciduous incisors are in place. The points of 

 the permanent canines are just visible. 



Purchased. 



3220. The symphysis of the lower jaw of an old Ass. 



The crowns of the incisors are much worn, and the ' mark ' nearly obliterated in the inter- 

 mediate pairs. 



Purchased. 



3221. The right astragalus of an Ass. Hunterian. 



3222. The left ectocuneiform bone of an Ass. Hunterian. 



The following are parts of the same skeleton of a Mule : 



Hunterian. 



3223. The atlas. 3224. The axis. 



3z2 



