Ill. 
IX. 
Subsquamosal only. 
Phascoluretos. 
. Postsquamosal only. 
Ornithorhyncus, Tamandua, Blurina, Condylura, Scalops. 
. Postparietal only. 
Rhinocerus, Aphelops. 
. Mastoid only. 
Hulicore, Manatus. 
. Postglenoid and subsquamosal only.. 
Hystriz, Hydrocharus, Capromys, Cclogenys, Sciurus, Haplo- 
dontia, Neotoma, Hesperomys, Mus, Arvicola. 
- Postglenoid and postsquamosal only. 
Hr inaceus. 
Macropus, Hypsiprymnus. 
Hapate. 
Postglenoid and postparietal. 
Chiroptera sp. 
Temnocyon, Enhydrocyon ; 
Archelurus, Dinictis, Pogonodon, Hoplophoneus, Macherodus. 
Cebus. ; . 
. Mastoid and postparietal. 
,. Mastoid small. 
Oreodon. 
. Mastoid enormous. 
Tapirus. 
. Mastoid, postglenoid and postsquamosal. 
Castor, Cynomys, Spermophilus. 
. Mastoid, postglenoid and subsquamosal. 
Dasyurus, Didelphys. 
. Mastoid, postglenoid and postparietal. 
Scotophilus ( fuses). 
Centetes. 
Hyenodon, Ursus, Arctotherium ; 
. Supraglenoid and postsquamosal only. 
Phascolomys. 
Vy. Supraglenoid and postglenoid only. 
Bos. 
. Supraglenoid, postglenoid and mastoid. 
Procamelus, Cumelus, Auchenia. 
. Supraglenoid, postglenoid, mastoid, postparietal. « 
. Supraglenoid small. 
Poébrotherium. 
. Supraglenoid large. 
Antilocapra. 
. Supraglenoid, postglenoid, mastoid and postsquamosal. 
. Supraglenoid small. 
Mippopotamus, Cheropsis, 
