563 



tion at their base. They are nineteen in number, six being central and thirteen peripheral, 

 but more regularly disposed in a narrower space of greater antero-posterior extent than in the 

 upper tooth. The columns rapidly decrease in length from the posterior ones which are in 

 use ; and it would seem by comparison with the same tooth in older animals, that a greater 

 number are subsequently added to the back part of the series. Thus in the fully-formed last 

 lower molar of No. 3362 the number of enamelled columns is twenty-six, nine being central 

 and seventeen peripheral. 



The teeth described in the foregoing paragraphs, Nos. 3372 to 3379, were removed from a 

 small head, in a dried state, of a Wart-hog, discovered by Sir Joseph Banks in his search 

 after the skulls of animals, deposited in the British Museum, with a view to further the re- 

 searches of Sir Everard Home on the teeth of the Sus ^thiopictts, which formed the sub- 

 ject of his memoir in the 'Philosophical Transactions' for 1799. The above-specified cha- 

 racter of the tusks, No. 3370, and the small proportional size of the fourth premolar, p 4, in 

 both jaws, with the minor breadth and thickness of the second and third true molars, prove 

 the species to which the head in question belonged to have been the Phacochaerns Pallatii, 

 and to be a distinct species from that figured also as the Su jEthiopicus in tab. xviii. of 

 the same memoir. 



Mm. Brit. 

 Genus Dicotyles. 



3380. A skeleton of the White-lipped Peccari (Dicotyles labiatus). 



The vertebral formula is : 7 cervical, 14 dorsal, 6 lumbar, 5 sacral, and 6 caudal. The 

 axis vertebra has a short pointed diapophysis : the third vertebra has a pleurapophysial la- 

 mella coextensive with the centrum. The corresponding lamella increases in extent in the 

 fourth, the fifth, and very remarkably so in the sixth cervical, and they overlap each other. 

 The bony plate between the anterior zygapophysis and diapophysis is perforated by the spinal 

 nerve in the last four cervical vertebrae. The third and fourth cervical vertebrae terminate 

 above in a large platform of bone supported by vertical neurapophysial walls, without a neural 

 spine. In the fifth a neural spine is developed, and the spine progressively increases in length 

 and inclines forwards hi the sixth and seventh cervicals. The neural spines of the first and 

 second dorsals are vertical, and as long as the pleurapophyses of the same vertebrae. The 

 succeeding dorsal spines gradually diminish in length and incline backwards to the twelfth, 

 which is short and vertical. The metapophyses begin to be developed at the third dorsal, 

 and increase in length to the eleventh, after which they rise upon the zygapophyses. The 

 neural arches of all the dorsal vertebrae are directly perforated by the spinal nerves, and the 

 base of the diapophysis is vertically perforated. The diapophysis of the fourteenth dorsal 

 vertebra begins to show the increase of size which characterizes the lumbar series. Seven 

 pairs of ribs directly articulate with the sternum, which consists of six bones. The humerus 

 is perforated between the condyles, and the radius and ulna have coalesced throughout nearly 

 their whole extent. In the right femur the medullary artery enters the upper and fore part 

 of the shaft, as in the common Hog : this is not the case with the left femur. The bones of 

 the feet are incomplete in the present skeleton. 



Hunterian. 



4c2 



