52 THE DOG’S SKULL. 
cartilage. The anterior portion of the middle 
of the maxilla is -visilble as a “thin! vertical 
plate; in front of which is the premaxilla, its 
inner border forming the anterior narial 
Fig. 8.—Transverse section through the posterior portion 
of the Skull, showing the tympanie bulla 
in seetion. (w.£.c. and F.W.c.) 
BS. Basi-sphenoid. Car. Carotid Canal. E, Eustachian canal. E.A.M. 
External auditory meatus. IC, Inner chamber. P A. Parietal. Pt, 
Periotic. Sq. Squamosal. S, Septum. T. Tympanicring. Ty. Tympanic. 
opening. A portion of the palatine, immedi- 
ately behind the maxilla, forms a vertical plate, 
its edge rising and meeting with the vomer. 
