58 



THE EONES. 



surpasses the mastoid process, and is prolonged to the mastoid protuberance. The latter 

 is very voluminous. The subuliform process is larger and stronger than in the Horse ; 

 and there is no mastoid fissure. 



In the Sheep and Goat, the mastoid process is scarcely distinct from the crest ; and 

 the mastoid portion of the bone is only at a late period consolidated with the petrous 

 portion. 



Fig. 29. 



OX'S HEAD; POSTERIOR FACE. 



A, Parietal bone. 1, Occipital foramen ; 2, Occipital condyle ; 3, Styloid process 

 of that bone ; 4, Condyloid foramina ; 5, Mastoid process ; 6, Mastoid protuber- 

 ance ; 7, Subuliform (temporal) process ; 8, Hyoideal sheath ; 9, Stylo-mastoid 

 foramen; 10, External auditory hiatus; 11, Inferior orifice of the parieto-tem- 

 poral canal; 12, Temporal condyle; 13, Posterior foramen lacerum ; 14, Oval 

 foramen ; 17, Subsphenoidal process ; 18, Orbital hiatus ; 19, Optic foramen. 

 B, Frontal bone. 20, Superciliary foramen; 21, Orbital foramen; 22, Lachrymal 

 protuberance. C, Zygoma. 23, Pterygoid bone. D, Palate bone. 24, Nasal fora- 

 men ; 25, Inferior orifice of the palatine canal. E, Supermaxillary bone. 26, 

 Maxillary spine. G, Premaxillary bone. 27, Its internal process ; 28, External 

 process ; 29, Incisive openings. 



7. Supermaxillary bone. In the Ox, Sheep, and Goat, the maxillary spine does not 

 directly join the zygomatic crest a curved line, whose concavity is posterior, effects the 

 union between these two parts. The inferior orifice of the supermaxillo-dental canal 

 or infraorbital foramen is pierced above the first molar tooth. There is no fissure for 

 the formation of the palatine canal. The cavity of the sinus is more spacious than in 

 the Horse, and is prolonged (in the Ox only) between the two laminae of the palatine 

 roof. There is no alveolus for the tusk. 



8. Premaxillary bone. The inferior or principal portion of this bone is flattened before 



