[Illustration FIG. 94. A, CRANIUM AND B, MANDIBLE OF A PIG (_Sus scrofa_) × 1/5. (Camb. Mus.) 1. jugal. 2. postorbital process of the frontal. 3. zygomatic process of the squamosal. 4. supra-occipital. 5. glenoid cavity. 6. occipital condyle. 7. foramen magnum. 8. paroccipital process of the exoccipital. 9. tympanic bulla. 10. pterygoid. 11. anterior palatine foramen. 12. palatal plate of maxillae. 13. coronoid process. 14. mandibular condyle. _i_ 1, _i_ 2, _i_ 3. first, second, and third incisors. _c._ canine. _pm_ 1, _pm_ 2, _pm_ 3, _pm_ 4. first, second, third, and fourth premolars. _m_ 1, _m_ 2, _m_ 3. first, second, and third molars.] The skull of the Pig[166] will be described as illustrative of the skull in the Suina. In the Pig as in most Artiodactyla the face is bent sharply down on the basicranial axis, the commencement of the vomer being situated below the mesethmoid instead of in front of it as in most skulls. The occipital region of the skull is small, and the line of junction of the supra-occipital and parietals is raised into a prominent occipital crest. The parietal completely fuses at an early stage with its fellow, and the exoccipital is drawn out into a long paroccipital process (fig. 94, A, 8). The frontal is large and broad and drawn out into a small postorbital process. The lachrymal too is large and takes a considerable part in forming the side of the face in front of the orbit, as does also the jugal, though to a less extent. The face is long and tapers much anteriorly. The nasals are long and narrow, as are the nasal processes of the premaxillae, which do not however reach the frontals. A prenasal ossicle is developed in front of the mesethmoid. The palate is long and narrow, the pterygoid (fig. 94, A, 10) is small, but the pterygoid process of the alisphenoid is prominent. The squamosal is small and has the tympanic fused with it; the tympanic is dilated below, forming a bulla (fig. 94, A, 9) filled with cancellous bone, and above forms the floor of a long upwardly-directed auditory meatus. The mandible has a high ascending portion and a small coronoid process (fig. 94, B, 13). The hyoid differs from that of most Ungulates, the stylo-hyal being very imperfectly ossified. [Illustration FIG. 95. MANDIBLE OF A HIPPOPOTAMUS (_H. amphibius_) × 1/7. (Camb. Mus.) The second incisor of the left side is missing and the crowns of the grinding teeth are much worn. 1. condyle. 2. coronoid process. 3. mental foramina. _i_ 1, _i_ 2. first and second incisors. _c._ canine. _pm_ 3. third premolar. _m_ 1, _m_ 3. first and third molar.]