PLATE XII. 



-Fig. Page 



1. Palceomastodon {X) headnelli, Andrews ; skull, lateral, (1 a) palatal, and 

 (1 b) posterior views : one-fourth nat. size. Fluvio-marine beds (Upper 

 Eocene). [M. 8464.] 130 



al., alisphenoid. 



al.c, alisphenoid canal. 



ao.f., antorbital foramen. 



hsp., basisphenoid. 

 e.a.m., external auditory meatus. 

 eu., eustachian opening. 



exo., exoccipital. 

 f.l.a., foramen lacerum anterius. 

 f.l.m., foramen lacerum medium. 

 f.l.p., foramen lacerum posterius. 



f.m., foramen magnum. 



/.o., foramen ovale. 



for., foramina opetiing into air-sinuses. 



i.c.c, foramen for internal common carotid. 



ju., jugal. 

 m. 1-3, molars. 

 mx., maxilla. 

 pa., parietal. 

 pi., palatine. 

 pm. 2-4, premolars. 



p.p., paroccipital process. 

 pp.f., posterior palatine foramen. 



pt., pterygoid. 

 pty., post-tympanic process. 

 s.c, sagittal crest. 

 soc, supraoccipital. 

 sq., squamosal. 

 st.m., stylomastoid foramen. 



