136 ZOOTOMY. 



29. On either side of the anterior extremity of the skull is 

 an aperture, the anterior nasal fossa, in which, in the 

 undried skull, are seen the cartilages bounding the external 

 nares ( 70, Fig. 37). 



30. The foramen magnum (Fig. 37, /;;/), a median 

 rounded aperture on the hinder surface of the skull, leading 

 into the brain cavity. 



31. The occipital condyle (Figs. 35 and 37, o.c), a 

 rounded surface beneath the foramen magnum, articulating 

 with the atlas. 



32. The posterior temporal fossae, two large vacuities, 

 one on either side of and above the foramen magnum : they 

 are bounded above and on the outside by the roofing bones, 

 and on the inner side by the bones which limit the foramen 

 magnum and form the actual roof of the brain cavity. 



33. The parotic process (Fig. 37, p.oc\ a horizontal 

 bar of bone, extending on each side directly outwards from 

 the side wall of the brain-case and bounding the posterior 

 temporal fossa below : the part of the wall of the brain-case 

 from which it springs lodges the organ of hearing, and is the 

 auditory capsule. 



34. The posterior nasal fossae, small paired apertures 

 on the ventral surface of the snout, at about the level of the 

 front edge of the orbit 



35. The palatine foramen, a large oval aperture, on 

 each side, just behind the posterior nasal fossa, and internal 

 to the hindermost teeth. 



36. The inferior temporal fossa, a large vacuity, 

 separated by a bony bar (the transpalatine, 61) from 

 the palatine foramen, and bounded externally by a number of 

 small scale-like bones which continue backwards the 

 alveolar margin. 



37. The glenoid surface, for the articulation of the 



