Fig. 109. Palatal views of the basieranial region of A. Pyrotherium, and B. Palaeomastodon, for comparisons; ale, alisphe- 



noidal canal; als., alisphenoid bone; Bsp., basisphenoid bone; cm., Eustachian canal; f.l.m., foramen lacerum medium; /.I. p., 



1 foramen lacerum posterior; f.o., foramen ovale; i.c.c, foramen for the internal common carotid; mx., maxilla; oc.f., occipital 



; foramen; pal., palatine bone; p.p./., post-palatal foramen; />/., pterygoid bone; pt.s., and p.ty.sq., post-tympanic process of 



the squamosum; sq., squamosum; st.m./., stylomastoid foramen. 



