PLATE VIII. 



Kg. Page 



1. Moeritlwrium lyonsi, Andrews ; nearly complete skull of a young individual, 

 upper, (1 a) lower, and (1 b) posterior views : one-half nat. size. Fluvio- 

 marine beds (Upper Eocene). [C. 7867.] 99 



ho., basioccipital. 

 c, canine alveolus. 

 cond., exoccipital condyles. 

 e.a.m., external auditory meatus. 



exo., exoccipitals. 

 f.l.p., foramen lacerum posterius. 

 for., foramina in squamosal. 

 /)•., frontal. 



gl., glenoid surface for mandible. 

 i. 2-3, second and third incisors or their alveoli. 



>., jugal. 

 n. 1-3, molars. 



mx., maxilla. 



m., nasal. 

 orb., orbit. 

 pa., parietal. 

 pi., palatine. 

 j)m.2-i, second to fourth premolars. 

 pmx., premaxilla. 

 p.p., paroccipital process. 

 pty., post-tympanic process. 

 soc, supraoccipital. 

 gq., squamosal. 



