PLATE XX. 



Eig. Page 



1. Eosiren libyca, Andrews; skull, side view, (1a) palate, (1b) exoccipitals : 



one-third nat. size. Qasr-el-Sagha beds (Middle Eocene). 



[Type specimen, C. 10054. J 198 



2. Ditto ; mandible, side and (2 a) ventral views : one-third nat. size. Same 



horizon. [C. 10040.J 209 



3. Ditto ; left scapula, outer view : one-third nat. size. Same horizon. 



[C. 10191.J 213 



4. (?) Ditto ; lumbar vertebra, front view : one-third nat. size. Same horizon 



[C. 10190.] 212 



5. Ditto ; caudal vertebra, front view : one-third nat. size. Same horizon. 



[C. 10190.] 213 



6. Ditto ; sacral vertebra, posterior view : one-third nat. size. Same horizon 



[C. 10190.] 212 



7. Ditto ; left humerus wanting proximal epiphyses, front view : one-third nat. 



size. Same horizon. [M, 9238.] 213 



8. Zenglodon osms, Dames ; imperfect skull, upper and (8 a) posterior views : 



one-fourth nat. size. Same horizon. [C. 10018.] 237 



a.p.f., anterior palatine foramen. 

 a.z., prezygapophyses. 

 h.g., bicipital groove. 



c, canine. 

 c.h., coracoid border. 

 cond., occipital condyle. 

 cor., coracoid process. 



d., deltoid crest. 

 exo., exoccipitals. 

 f.m., foramen magnum. 

 fr., f rentals. 



cjl., glenoid cavity of scapula. 

 g.t., greater (outer) tuberosity. 

 i. 1-3, incisors. 



i.e., inner condyle. 

 I.e., lambdoidal crest. 



l.t., lesser (inner) tuberosity. 

 m.f., mental foramen. 

 ma:., maxilla. 

 na., nasals. 

 nar., external nares. 

 pa., parietals. 

 pm. 1-2, premolars. 

 pmx., premaxilla. 

 S.C., sagittal crest. 

 soe., supraoccipital. 

 sp., spine of scapula, 

 sj., squamosal. 

 s.r., sacral rib. 

 sym., symphysis of mandible. 



tr., distal articulation of humerus. 

 zyg., zygomatic process. 



