32 ELEMENTS OF MAMMALIAN ANATOMY. 
Fic. 17. VENTRAL ASPECT OF THE SKULL WITH THE Lerr AUDITORY 
Butta Removen. 
asp, Alisphenoid; ap, anterior palatine foramina; bs, basisphenoid; bl, 
auditory bulla; bo, basioccipital ; c, canine tooth; e, petrous portion 
of the temporal; en, occipital condyle; ea, external auditory meatus; 
ch, opening of the Eustachian tube; fr, frontal; fm, foramen mag- 
num; gc, glenoid cavity; gn, postglenoid process; hm, hamular proc- 
ess of the pterygoid; ic, incisor tooth; if, infraorbital foramen; in, 
incus; jg, jugular foramen; /d, lambdoidal ridge; mx, maxilla; ml, 
molar tooth; mp, mastoid process; ws, mastoid portion of the tem- 
poral; maz, malar; m, malleus; osp, orbitosphenoid; ov. foramen 
