551 

 3817. A tray of lower tusks of the Wild Boar. 



3318. The fourth left upper premolar, p 4, with the partially absorbed fangs of the 

 fourth deciduous molar which it was about to displace. 



3319. The first,/? 1, second, p 2, and third, p 3, lower premolars. 



3320. The first left upper molar, m 1. 3321. The second upper molars, m 2. 



3322. The crown of the second right upper molar, m 2. 



3323. The germ of the right, upper, third molar, m 3. 



3324. A smaller germ of the right, upper, third molar. 



3325. The germ of the left, lower, third molar. 



3326. The crown of the left, upper, third molar. 



3327. The crown of the right, upper, third molar. 



3328. The skull of a young Pig (Sus Scrofa), with the bones separated, artificially 

 connected together, and numbered on coloured labels according to the TABLE 

 OF SYNONYMS, so as to illustrate the segmental or vertebral constitution of 

 the skull. 



The neural arch of the occipital vertebra, i, * and s, agrees with that of the bird and 

 crocodile in the coalescence of the parapophysis, 4, with the neurapophysis, i ; but the pro- 

 cess, called ' paroccipital,' of 4 now descends from the lower part of the arch, and, as in many 

 other mammals, is of great length. An articular condyle is developed from each neurapo- 

 physis, i, which articulates with the concave anterior zygapophysis of the atlas, and is the 

 homotype of the posterior zygapophysis in the trunk-vertebrae. The centrum (i) is reduced 

 to a compressed plate, and its hinder articular surface is not more developed than is the 

 front one of the centrum of the atlas, with which it is connected by ligament. The expanse 



