FOSSIL HYEACOIDS FROM THE FAYiyiM. 845 



fi'om the tip of mandibular symphysis to the 

 posterior side of lower Dm, measuring ca. 



114 mna. in a young individual with functional 



milk-molars (Schlosser's fig. ) pcdceotherioides . 



(4) Rather small species ; length of lower M 



76 mm. (tj'pe - specimen : C. 8822-3) ; lower 

 cheek-teeth of short and wide type ; snout 

 verj'' short, the distance from the tip of 

 mandibular symphysis to the posterior side 

 of lower P measuring only 86 mm. in an old 



individual with much worn premolars and 



molars (type-specimen) andreivsi. 



(1) TiTANOHYEAX ULTIMUS, Sp. n. 



2 



M. 12057 ; type-specimen ; isolated, right upper M • 

 M. 12058 ; paratype ; isolated, left lower M^. 



4 



M. 12059 ; paratype; isolated, left upper P . 

 M. 9479 ; paratype ; isolated, left upper 0. 



Text-figure 2. 



Titanohi/rax idtimus, g. & sp. n., Matsumoto. Crown view of right upper M- ; 

 natural size ; M. 12057 ; type-specimen. 

 2 



The M , the type-specimen, is strongly worn (text-fig. 2). The 

 acute mesostylar fold is a generic character ; the parastylar folds 

 are broken away in this specimen. The outer surface of both the 

 paracone and metacone are distinctly concave, without distinct 

 paraconal and metaconal folds, also a generic character. The 

 inner to posterior surface of the protocone and the anterior to 

 inner surface of the hypocone are smoothly rounded, without 

 any ridge, also generic characters. The anterior and inner basal 

 cingula are continuous to each other, extending from, the 



