_I_, Occipital; _II_, tympanic part of temporal; _IIa_, squamous part of temporal; _IIb_, mastoid part of temporal; _III_, sphenoid; _IV_, pterygoid; _V_, palate bone; _VI_, vomer; _VII_, malar; _VIII_, zygomatic arch; _IX_, inner wall of orbit; _X_, palatine process of maxilla; _XI_, premaxilla; _XII_, orbital cavity; _1_, _1_, tubercles above foramen magnum; _2_, foramen magnum; _3_, occipital condyle; _4_, notch between occipital condyles; _5_, condyloid fossa; _6_, hypoglossal foramen; _7_, paramastoid (styloid, jugular) process; _8_, for. lacerum and posterior opening of carotid canal; _9_, petro-occipital synchondrosis; _10_, petro-tympanic fissure; _11_, tubercle; _12_, bulla ossea; _13_, muscular process of petrous; _14_, carotid foramen; _15_, osseous Eustachian tube; _16_, postglenoid process; _17_, glenoid cavity; _18_, for. ovale; _19_, posterior opening of alar canal; _20_, external opening of parieto-temporal canal; _21_, stylo-mastoid foramen; _22_, external auditory meatus; _23_, temporal crest; _24_, zygomatic process of temporal bone; _25_, body of postsphenoid; _26_, body of presphenoid; _27_, anterior opening of alar canal; _28_, for. lacerum orbitale; _29_, optic foramen; _30_, hamulus of pterygoid; _31_, horizontal part of palate bone; _32_, perpendicular part of palate bone; _33_, median palatine suture; _34_, palato-maxillary suture; _35_, posterior nasal spine; _36_, anterior palatine foramen; _37_, palatine groove; _38_, alveolar border of maxilla; _39_, palatine process of maxilla; _40_, pterygoid process of maxilla; _41_, palatine fissure; _42_, body of premaxilla; _43_, palatine process of premaxilla; _44_, alveolar border of premaxilla; _45_, supraorbital process of frontal bone. (Ellenberger-Baum, Anat. d. Hundes.) ] The =occipital bone= is similar in position to that of the horse. The crest, is prominent, angular, and directed backward. Just below the crest are two rough imprints or tubercles for muscular attachment. The surface below these is convex from side to side and concave from above downward. On either side, at the junction with the squamous, there is a foramen which communicates with the parieto-temporal canal. The condyles are somewhat flattened and are widely separated above; at the inner side of each is a short condyloid canal, which opens into the parieto-temporal canal. The paramastoid processes are very short. The basilar part is wide and joins the bulla ossea on either side; its lower surface is flattened and the tubercles are at the junction with the bulla. The hypoglossal foramen is small and is close to the foramen lacerum posterius; the latter is bounded in front by the bulla ossea, behind and internally by the occipital bone.