84 THE CAT. [chap. hi. 



the foramen magnum to tlie front end of tlie middle part of the 



Fk 



48.— Outline of Vertical Section of Skull, to show by straight black lines the 



INCLINATION OF THE BaSI-FACIAL AXIS TO THE BaSI-CRANIAL AXIS, AND THE ANGLES 

 FORMED WITH THE LATTER BY THE PLANES OF THE CRIBRIFORM PlATE AND OCCIPITAL 

 FoEAWEN ; ALSO THE RELATIVE CEREBRAL LENGTH. 



he. Basi-erniiial axis. 



bf. Basi-fai'ial axis. 



c. Length from the front end of the basi-crauial 



axis to the summit of the attaehmcut of tlie 



tentoriiiin. 



(•/). Plane of cribriform plate. 



fin. Plane of foramen magnum. 



upper (or cerehral) surface of the pre-sphenoid is called the hasi- 

 cranial axis (Fig. 48, he). A line drawn from the same point of the 



Fig. 49.— Vertical Antero-posterior Section op Skull, made a little nearer the 

 Spectator than the exact middle line to show the Median Ethmoid, etc 



((/. Aqueduct of Fallojiius. 



ai. Internal auditory meatus. 



h. Auditory bulla. 



ho. Basi-oeeiiiitiil. 



c. 0cci)>ital condyle. 



el. Lateral ethmoid. 



/. Frontal. 



/to. Foramen magnum. 



ip. Inter-]iarietal. 



mc. Mesetliniiiid. 



int. Ethino-turbinal. 



m. Nasal." 

 jis. Pre-sjihenoid. 

 j)t. Pterygoid. 

 s. S(iuamosai. 

 sq. Basi-siihenoid. 

 so. Suijra-occiiiital. 

 t. Inner surface of frontal. 

 r. Vomer. 



The anterior condyloid foramen 

 and 6o, just over the letter h. 



above c 



pre-sphenoid to the front part of the al7eolar margin of the pre- 



