620 THE EOCENE FATWA. 



the elongate and narrowed symplnsis of the lower jaw. The orbit i& 

 rather small, and is bounded posteriori}' above by a short, sharp decurved 

 postorbital process. The anterior temporal ridge is an angle which extends 

 diagonally to meet the one of the opposite side, probably to form a sagittal 

 crest, which is, however, lost from the specimens in my possession. 



The superior canine is lost, but the alveolus has nearly a vertical direc- 

 tion. The first premolar is two-rooted and is situated close to it. The sec- 

 tions of the crown, both vertical and horizontal, are triangular; the anterior 

 edge is acute. The second premolar has a double external cusp, and low 

 anterior and posterior basal lobes. The internal lobe is prominent but not 

 elevated. It is connected with the extei-nal angles by a narrow anterior 

 cingulum, and a wide posterior one. No external cingulum. The third 

 superior premolar has much the form of the second, but the internal lobe is 

 more prominent inwards and more elevated. No intermediate tubercles 

 The anterior outline of the base is concave, partly owing to the large size 

 of the anterior external cingular cusps, and the posterior is convex. The 

 fourth premolar is more transverse owing to the greater development of the 

 internal lobe. The anterior border of the base is not concave. There are 

 a strong anterior and a strong posterior basal cingulum, but no external nor 

 internal cingula. The internal cusp is connected with the external lobes by 

 two obtuse cross-crests. No intermediate tubercles, nor external cingulum. 

 The true molars only indicate the primitive intermediate tubercles by a 

 slight thickening of the transverse crest, and this is scarcely perceptible on 

 the last molar. The last-named does not differ in size and proportions from 

 the second molar. All three have a well-developed anterior external cin- 

 gular cusp, and an anterior and posterior cingulum. There is a short one 

 between the internal cusps, and an external one at the base of the posterior 

 cusp. On the first two molars there is a rudimental one at the base of the 

 anterior cusp also. The enamel of all these teeth, where not worn, is 

 finely wrinkled. 



The first premolar, canine, and incisors of the lower jaw form an unin- 

 terrupted series. The incisors are closely packed, and have narrow root& 

 and transverse crowns They are dii-ected at an angle of 45° forwards- 

 and upwards. The canine is much larger than the incisors and first pre- 



